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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

☒			QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2025

OR

☐			TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from              to             

Commission File Number 1-32190

NEWMARKET CORPORATION

(Exact name of registrant as specified in its charter)

 

Virginia									20-0812170
(State or other jurisdiction of incorporation or organization)									(I.R.S. Employer Identification No.)
330 South Fourth Street									23219-4350
Richmond,			Virginia
(Address of principal executive offices)									(Zip Code)

Registrant’s telephone number, including area code - (804) 788-5000

Securities registered pursuant to Section 12(b) of the Act:

Title of each class			Trading Symbol(s)			Name of each exchange on which registered
Common Stock, with no par value			NEU			New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports); and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (Section 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer

x

Accelerated filer

¨

Non-accelerated filer

¨

Smaller reporting company

☐

Emerging growth company

☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

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Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes  ☐ No  x

Number of shares of common stock, with no par value, outstanding as of March 31, 2025: 9,434,506

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NEWMARKET CORPORATION

INDEX

			Page Number
PART I. FINANCIAL INFORMATION
ITEM 1. Financial Statements (unaudited)
Consolidated Statements of Income - Three Months Ended March 31, 2025 and March 31, 2024			4
Consolidated Statements of Comprehensive Income - Three Months Ended March 31, 2025 and March 31, 2024			5
Condensed Consolidated Balance Sheets - March 31, 2025 and December 31, 2024			6
Consolidated Statements of Shareholders' Equity - Three Months Ended March 31, 2025 and March 31, 2024			7
Condensed Consolidated Statements of Cash Flows - Three Months Ended March 31, 2025 and March 31, 2024			8
Notes to Condensed Consolidated Financial Statements			9
Financial Statement Presentation			9
Acquisition of Business			9
Net Sales			11
Segment Information			11
Pension Plans and Other Postretirement Benefits			13
Earnings Per Share			14
Inventories			15
Intangibles (Net of Amortization) and Goodwill			15
Long-term Debt			16
Commitments and Contingencies			16
Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss			17
Fair Value Measurements			17
Recent Accounting Pronouncements			18
ITEM 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations			19
ITEM 3. Quantitative and Qualitative Disclosures About Market Risk			24
ITEM 4. Controls and Procedures			24
PART II. OTHER INFORMATION
ITEM 1. Legal Proceedings			26
ITEM 2. Unregistered Sales of Equity Securities and Use of Proceeds			26
ITEM 5. Other Information			26
ITEM 6. Exhibits			26
SIGNATURES			27

3

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PART I.    FINANCIAL INFORMATION

ITEM 1.     Financial Statements

NEWMARKET CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME

(Unaudited)

 

(in thousands, except per-share amounts)												Three Months Ended March 31,
																		2025						2024
Net sales																		$	700,946					$	696,736
Cost of goods sold																		464,923						480,371
Gross profit																		236,023						216,365
Selling, general, and administrative expenses																		42,978						44,365
Research, development, and testing expenses																		33,176						31,200
Operating profit																		159,869						140,800
Interest and financing expenses, net																		10,700						15,654
Other income (expense), net																		14,944						12,547
Income before income tax expense																		164,113						137,693
Income tax expense																		38,164						29,961
Net income																		$	125,949					$	107,732
Earnings per share - basic and diluted																		$	13.26					$	11.23
Cash dividends declared per share																		$	2.75					$	2.50

See accompanying Notes to Condensed Consolidated Financial Statements

4

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NEWMARKET CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

(in thousands)												Three Months Ended March 31,
																		2025						2024
Net income																		$	125,949					$	107,732
Other comprehensive income (loss):
Pension plans and other postretirement benefits:
Amortization of prior service cost (credit) included in net periodic benefit cost (income), net of income tax expense (benefit) of $(177) in the first quarter 2025 and $(174) in the first quarter 2024																		(500)						(502)
Amortization of actuarial net loss (gain) included in net periodic benefit cost (income), net of income tax expense (benefit) of $(341) in the first quarter 2025 and $(122) in the first quarter 2024																		(989)						(358)
Total pension plans and other postretirement benefits																		(1,489)						(860)
Foreign currency translation adjustments, net of income tax expense (benefit) of $496 in the first quarter 2025 and $(238) in the first quarter 2024																		12,515						(6,943)
Other comprehensive income (loss)																		11,026						(7,803)
Comprehensive income																		$	136,975					$	99,929

See accompanying Notes to Condensed Consolidated Financial Statements

5

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NEWMARKET CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited)

(in thousands, except share amounts)						March 31, 2025						December 31, 2024
ASSETS
Current assets:
Cash and cash equivalents						$	118,253					$	77,476
Trade and other accounts receivable, less allowance for credit losses						463,337						395,450
Inventories						489,759						505,426
Prepaid expenses and other current assets						52,415						51,203
Total current assets						1,123,764						1,029,555
Property, plant, and equipment, net						734,580						735,361
Intangibles (net of amortization) and goodwill						744,126						750,424
Prepaid pension cost						503,042						490,418
Operating lease right-of-use assets, net						75,197						71,253
Deferred charges and other assets						52,215						52,530
Total assets						$	3,232,924					$	3,129,541
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Accounts payable						$	249,757					$	225,874
Accrued expenses						70,463						89,277
Dividends payable						21,698						22,037
Income taxes payable						32,261						15,798
Operating lease liabilities						16,303						15,337
Other current liabilities						5,775						6,155
Total current liabilities						396,257						374,478
Long-term debt						990,555						971,281
Operating lease liabilities-noncurrent						58,100						54,754
Other noncurrent liabilities						268,516						267,445
Total liabilities						1,713,428						1,667,958
Commitments and contingencies (Note 10)
Shareholders’ equity:
Common stock and paid-in capital (with no par value; authorized shares - 80,000,000; issued and outstanding shares - 9,434,506 at March 31, 2025 and 9,524,789 at December 31, 2024)						0						0
Accumulated other comprehensive income						43,896						32,870
Retained earnings						1,475,600						1,428,713
Total shareholders’ equity						1,519,496						1,461,583
Total liabilities and shareholders’ equity						$	3,232,924					$	3,129,541

See accompanying Notes to Condensed Consolidated Financial Statements

6

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NEWMARKET CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY

(Unaudited)

(in thousands, except share and per-share amounts)						Common Stock and Paid-in Capital												Accumulated Other Comprehensive Income (Loss)						Retained Earnings						Total Shareholders’ Equity
						Shares						Amount
Balance at December 31, 2023						9,590,086						$	2,130					$	(21,071)					$	1,096,002					$	1,077,061
Net income																								107,732						107,732
Other comprehensive income (loss)																		(7,803)												(7,803)
Cash dividends ($2.50 per share)																								(23,986)						(23,986)
Tax withholdings related to stock-based compensation						(1,816)						(1,118)																		(1,118)
Stock-based compensation						5,980						394												8						402
Balance at March 31, 2024						9,594,250						$	1,406					$	(28,874)					$	1,179,756					$	1,152,288
Balance at December 31, 2024						9,524,789						$	0					$	32,870					$	1,428,713					$	1,461,583
Net income																								125,949						125,949
Other comprehensive income (loss)																		11,026												11,026
Cash dividends ($2.75 per share)																								(26,057)						(26,057)
Repurchases of common stock						(96,846)						(488)												(52,003)						(52,491)
Tax withholdings related to stock-based compensation						(1,846)						0												(1,002)						(1,002)
Stock-based compensation						8,409						488												0						488
Balance at March 31, 2025						9,434,506						$	0					$	43,896					$	1,475,600					$	1,519,496

See accompanying Notes to Condensed Consolidated Financial Statements

7

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NEWMARKET CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

(in thousands)						Three Months Ended March 31,
						2025						2024
Cash and cash equivalents at beginning of year						$	77,476					$	111,936
Cash flows from operating activities:
Net income						125,949						107,732
Adjustments to reconcile net income to cash provided from operating activities:
Depreciation and amortization						28,778						25,807
Deferred income tax expense (benefit)						505						(3,899)
Working capital changes						(26,590)						(21,434)
Cash pension and postretirement contributions						(2,374)						(2,727)
Other, net						(5,955)						(2,640)
Cash provided from (used in) operating activities						120,313						102,839
Cash flows from investing activities:
Capital expenditures						(13,016)						(13,564)
Acquisition of business (net of $15,580 of cash acquired)						0						(683,924)
Cash provided from (used in) investing activities						(13,016)						(697,488)
Cash flows from financing activities:
Net borrowings under revolving credit facility						69,000						386,000
Principal payment on 3.78% senior notes						(50,000)						0
Repurchases of common stock						(57,064)						0
Dividends paid						(26,057)						(23,986)
Proceeds from term loan						0						250,000
Debt issuance costs						0						(2,251)
Other, net						(4,345)						(8,372)
Cash provided from (used in) financing activities						(68,466)						601,391
Effect of foreign exchange on cash and cash equivalents						1,946						(1,612)
Increase in cash and cash equivalents						40,777						5,130
Cash and cash equivalents at end of period						$	118,253					$	117,066

See accompanying Notes to Condensed Consolidated Financial Statements

8

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NEWMARKET CORPORATION AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1.    Financial Statement Presentation

In the opinion of management, the accompanying consolidated financial statements of NewMarket Corporation and its subsidiaries contain all necessary adjustments for the fair presentation of, in all material respects, our consolidated financial position as of March 31, 2025 and December 31, 2024, our consolidated results of operations, comprehensive income, and changes in shareholders' equity for the three months ended March 31, 2025 and March 31, 2024, and our cash flows for the three months ended March 31, 2025 and March 31, 2024. All adjustments are of a normal, recurring nature, unless otherwise disclosed. These financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) for interim financial information and the instructions to Rule 10-01 of Regulation S-X of the Securities and Exchange Commission (SEC), but do not include all disclosures required by GAAP for complete annual consolidated financial statements. These financial statements should be read in conjunction with the consolidated financial statements and related notes included in the NewMarket Corporation Annual Report on Form 10-K for the year ended December 31, 2024 (2024 Annual Report), as filed with the SEC. The results of operations for the three-month period ended March 31, 2025 are not necessarily indicative of the results to be expected for the full year ending December 31, 2025.

Unless the context otherwise indicates, all references to “we,” “us,” “our,” the “company,” and “NewMarket” are to NewMarket Corporation and its consolidated subsidiaries.

Supplier Finance Program

We offer our vendors a supplier finance program, which allows our vendors to receive payment from a third-party finance provider earlier than our normal payment terms would provide. NewMarket and its subsidiaries are not a party to any arrangement between our vendors and the finance provider, and there are no assets pledged as security or other forms of guarantees provided by NewMarket to the finance provider. For those vendors who opt to participate in the program, we pay the finance provider the full amount of the invoices on the normal due date. At both March 31, 2025 and December 31, 2024, the amount of confirmed invoices under the supplier finance program was not material.

2.    Acquisition of Business

On January 16, 2024, we completed the acquisition of all issued and outstanding ownership units of AMPAC Intermediate Holdings, LLC, the ultimate parent company of American Pacific Corporation (AMPAC), for approximately $697 million. Based in Cedar City, Utah, AMPAC has one operating facility from which it manufactures and sells critical specialty materials primarily used in solid rocket motors for space launch and military defense applications. AMPAC is qualified on many NASA and Department of Defense programs and has been serving space launch and national defense programs for more than 60 years. The acquisition of AMPAC expands our presence in mission-critical, resilient sectors. It was funded by cash on hand and borrowings under our then existing revolving credit facility. The purchase consideration was subject to a customary post-closing adjustment for working capital, which was finalized during the second quarter of 2024.

The fair values of the assets acquired and the liabilities assumed in the AMPAC acquisition are as follows (in millions):

Cash and cash equivalents						$	16
Trade and other accounts receivable, net						6
Inventories						25
Prepaid expenses and other current assets						3
Property, plant, and equipment, net						111
Intangibles and goodwill						650
Deferred charges and other assets						5
Accounts payable						(3)
Accrued expenses						(5)
Other noncurrent liabilities						(111)
Fair value of net assets acquired						$	697

9

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NEWMARKET CORPORATION AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Identified intangible assets acquired consisted of the following (in millions):

						Fair Value						Estimated Useful Lives (in years)
Customer base						$	275					17.5
Formulas and technology						60						8
Trademarks and trade names						30						15
Water rights						29						indefinite
						$	394

As part of the acquisition, we recorded $256 million of goodwill. The goodwill recognized is attributable to increased access to mission-critical, resilient sectors with a role in global safety, security, and space exploration, as well as the value of the skilled assembled workforce of AMPAC. All of the goodwill recognized is part of the specialty materials segment, and none of the goodwill is deductible for income tax purposes.

The allocation of the purchase price of AMPAC to the tangible and intangible assets acquired and liabilities assumed was developed using estimates of fair value. Acquisition-related charges of $1 million consisted primarily of legal and professional fees and are included in selling, general, and administrative expenses in our Consolidated Statements of Income for the three months ended March 31, 2024.

We accounted for this acquisition using the acquisition method of accounting for business combinations under the provisions of Financial Accounting Standards Board (FASB) Accounting Standard Codification (ASC) Topic 805, Business Combinations and have included the results of operations of the acquired business from the date of acquisition in our Consolidated Statements of Income as well as in the specialty materials segment in Note 4. These results include a charge related to the sale of finished goods inventory acquired, which was recorded at fair value on the acquisition date and sold to customers during 2024.

The following table presents the financial results in thousands for AMPAC from the date of acquisition through March 31, 2024 (in thousands).

AMPAC						January 16 to March 31, 2024
Net sales						$	17,047
Loss before income taxes						(5,001)

The following table presents our estimated unaudited pro forma consolidated results for the three months ended March 31, 2024, assuming the acquisition of AMPAC had occurred on January 1, 2023. The unaudited pro forma information is presented for informational purposes only and is not indicative of the results of operations that would have been realized if the acquisition had been completed at the beginning of 2023, nor is it indicative of expected results for any future period. In addition, no effect is given to any future synergistic benefits that could result from the integration of AMPAC into NewMarket.

Unaudited pro forma information for the three months ended March 31, 2024 includes adjustments to depreciation and amortization based upon the fair value allocation of the purchase price to AMPAC's tangible and intangible assets acquired and liabilities assumed as though the acquisition had occurred on January 1, 2023, as well as adjustments for debt-related costs and management fees. The acquisition-related costs and the charge related to the fair value adjustment to acquisition-date inventory were recognized in actual results during the three months ended March 31, 2024, but for the presentation below, these costs are excluded from 2024 unaudited pro forma income before income taxes since on a pro forma basis, they would have been incurred during 2023.

Pro Forma Supplemental Information (unaudited) (in thousands)
Consolidated						Three Months Ended March 31, 2024
Net sales						$	701,836
Income before income taxes						140,004

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NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

3.    Net Sales

Our revenues are predominantly derived from the manufacture and sale of petroleum additives products. We sell petroleum additives products across the world to customers located in the North America (the United States and Canada), Latin America (Mexico, Central America, and South America), Asia Pacific, and EMEAI (Europe/Middle East/Africa/India) regions. Our petroleum additives customers primarily consist of global, national, and independent oil companies. Our petroleum additives contracts generally include one performance obligation, which is satisfied at a point in time when products are shipped, delivered, or consumed by the customer, depending on the underlying contracts.

Additionally, we have revenue from the manufacture and sale of critical specialty materials products used primarily in solid rocket motors for space launch and military defense applications. The sale of specialty materials products is predominantly to customers located in the United States, with limited amounts to customers in other countries. Our specialty materials customers are primarily contractors or subcontractors of the U.S. government. Specialty materials contracts generally include one performance obligation, which is typically satisfied at a point in time when the products are shipped from the plant site.

In limited cases, we collect funds in advance of shipping product to our customers and recognizing the related revenue. These prepayments from customers are recorded as a contract liability until we recognize the revenue. Some of our contracts also include variable consideration in the form of rebates, tiered pricing, and/or business development funds. We regularly review these and make adjustments when necessary, recognizing the full amount of any adjustment in the period identified.

The following table provides information on our net sales by geographic area. Information on net sales by segment is presented in Note 4.

												Three Months Ended March 31,
(in thousands)																		2025						2024
Net sales
United States																		$	270,876					$	248,236
Europe, Middle East, Africa, India																		201,676						208,939
Asia Pacific																		147,436						156,099
Other foreign																		80,958						83,462
Net sales																		$	700,946					$	696,736

4. Segment Information

We have two reportable segments – petroleum additives and specialty materials. The petroleum additives segment includes lubricant and fuel additives which are necessary for the efficient and reliable operation of vehicles and machinery. The specialty materials segment includes critical materials used in solid rocket motors for space launch and military defense applications. The petroleum additives and specialty materials segments are managed separately by the president of Afton and the president of AMPAC, respectively. The “All other” category shown in the tables below includes the operations of the antiknock compounds business, as well as certain contracted manufacturing and related services associated with Ethyl.

We have determined that our chief executive officer is the chief operating decision maker (CODM) who makes key operating decisions and assesses the performance of the reportable segments. The CODM evaluates performance based on segment operating profit and considers budgeted and forecasted variances to actual results in allocating resources to the segments.

The segment accounting policies are the same as those described in Note 1 of our 2024 Annual Report. NewMarket Services expenses are billed to Afton, AMPAC, and Ethyl based on the services provided. Depreciation on segment property, plant, and equipment, as well as amortization of segment definite-lived intangible assets and lease right-of-use assets are included in segment operating profit. No transfers occurred between any of the petroleum additives segment, specialty materials segment, and the “All other” category during the periods presented.

The table below reports net sales and operating profit by segment, as well as a reconciliation to income before income tax expense, for the three months ended March 31, 2025 and March 31, 2024. No single customer accounted for 10% or more of our total net sales in any period presented.

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NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

						Three Months Ended March 31,
(in thousands)						2025						2024
Net sales
Petroleum additives
Lubricant additives						$	559,178					$	571,915
Fuel additives						86,376						105,349
Total						645,554						677,264
Specialty materials						53,721						17,047
All other						1,671						2,425
Total net sales						$	700,946					$	696,736
Segment operating profit
Petroleum additives
Net sales						$	645,554					$	677,264
Cost of goods sold						(437,746)						(462,920)
Research, development, and testing expenses						(33,176)						(31,200)
Other segment items						(32,525)						(32,235)
Petroleum additives segment operating profit						142,107						150,909
Specialty materials
Net sales						53,721						17,047
Other segment items						(30,534)						(22,014)
Specialty materials segment operating profit						23,187						(4,967)
Total segment operating profit						165,294						145,942
All other						(481)						(81)
Corporate, general, and administrative expenses						(4,886)						(5,557)
Interest and financing expenses, net						(10,700)						(15,654)
Other income (expense), net						14,886						13,043
Income before income tax expense						$	164,113					$	137,693

The significant expense categories of cost of goods sold and research, development, and testing expenses are shown in the above segment operating profit table for the petroleum additives segment and are regularly provided to the CODM. The other segment items for the petroleum additives segment represent selling, general, and administrative expenses, as well as corporate services allocated to the reporting segment.

The other segment items for the specialty materials segment include costs of goods sold; selling, general, and administrative expenses; and corporate services allocated to the reporting segment. Significant expense categories of the specialty materials segment are not regularly provided to the CODM.

Asset information by segment is not reported internally or otherwise regularly provided to the CODM.

The following tables show additions to long-lived assets by segment and depreciation and amortization by segment and the reconciliation to both consolidated amounts. The additions to long-lived assets include property, plant, and equipment and lease right-of-use assets.

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NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

						Three Months Ended March 31,
(in thousands)						2025						2024
Additions to long-lived assets
Petroleum additives						$	20,274					$	21,304
Specialty materials						888						1,437
All other						0						2
Corporate						1,092						540
Total additions to long-lived assets						$	22,254					$	23,283
Depreciation and amortization
Petroleum additives						$	18,979					$	19,074
Specialty materials						8,858						5,639
All other						12						11
Corporate						929						1,083
Total depreciation and amortization						$	28,778					$	25,807

5.    Pension Plans and Other Postretirement Benefits

The table below shows cash contributions made during the three months ended March 31, 2025, as well as the remaining cash contributions we expect to make during the year ending December 31, 2025, for our domestic and foreign pension plans and domestic postretirement benefit plan.

(in thousands)						Actual Cash Contributions for Three Months Ended March 31, 2025						Expected Remaining Cash Contributions for Year Ending  December 31, 2025
Domestic plans
Pension benefits						$	832					$	3,004
Postretirement benefits						413						696
Foreign plans
Pension benefits						1,129						3,888

The tables below present information on net periodic benefit cost (income) for our domestic and foreign pension plans and domestic postretirement benefit plan. The service cost component of net periodic benefit cost (income) is reflected in cost of goods sold; selling, general, and administrative expenses; or research, development, and testing expenses, according to where other compensation costs arising from services rendered by the pertinent employee are recorded on the Consolidated Statements of Income. The remaining components of net periodic benefit cost (income) are recorded in other income (expense), net on the Consolidated Statements of Income.

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NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

						Domestic
						Pension Benefits												Postretirement Benefits
						Three Months Ended March 31,
(in thousands)						2025						2024						2025						2024
Service cost						$	2,857					$	3,016					$	139					$	135
Interest cost						6,200						5,722						414						418
Expected return on plan assets						(15,114)						(13,541)						(199)						(192)
Amortization of prior service cost (credit)						45						47						(757)						(757)
Amortization of actuarial net (gain) loss						(1,012)						(457)						(70)						(16)
Net periodic benefit cost (income)						$	(7,024)					$	(5,213)					$	(473)					$	(412)

																		Foreign
																		Pension Benefits
												Three Months Ended March 31,
(in thousands)																		2025						2024
Service cost																		$	807					$	1,087
Interest cost																		1,631						1,618
Expected return on plan assets																		(3,877)						(3,333)
Amortization of prior service cost (credit)																		35						35
Amortization of actuarial net (gain) loss																		(247)						(7)
Net periodic benefit cost (income)																		$	(1,651)					$	(600)

6.    Earnings Per Share

We had 38,275 shares of nonvested restricted stock at March 31, 2025 and 34,678 shares of nonvested restricted stock at March 31, 2024 that were excluded from the calculation of diluted earnings per share, as their effect on earnings per share would be anti-dilutive. The nonvested restricted stock is considered a participating security since the restricted stock contains nonforfeitable rights to dividends. As such, we use the two-class method to compute basic and diluted earnings per share for all periods presented since this method yields the most dilutive result. The following table illustrates the earnings allocation method utilized in the calculation of basic and diluted earnings per share.

												Three Months Ended March 31,
(in thousands, except per-share amounts)																		2025						2024
Earnings per share numerator:
Net income attributable to common shareholders before allocation of earnings to participating securities																		$	125,949					$	107,732
Earnings allocated to participating securities																		(480)						(373)
Net income attributable to common shareholders after allocation of earnings to participating securities																		$	125,469					$	107,359
Earnings per share denominator:
Weighted-average number of shares of common stock outstanding - basic and diluted																		9,460						9,557
Earnings per share - basic and diluted																		$	13.26					$	11.23

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NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

7.        Inventories

(in thousands)						March 31, 2025						December 31, 2024
Finished goods and work-in-process						$	385,943					$	403,459
Raw materials						78,012						77,258
Stores, supplies, and other						25,804						24,709
						$	489,759					$	505,426

8.    Intangibles (Net of Amortization) and Goodwill

The net carrying amount of intangibles and goodwill was $744 million at March 31, 2025 and $750 million at December 31, 2024. The gross carrying amount and accumulated amortization of each type of intangible asset and goodwill are presented in the table below.

						March 31, 2025												December 31, 2024
(in thousands)						Gross Carrying Amount						Accumulated Amortization						Gross Carrying Amount						Accumulated Amortization
Amortizing intangible assets
Formulas and technology						$	60,000					$	9,095					$	60,000					$	7,220
Customer bases						280,440						23,832						280,440						19,856
Trademarks and trade names						30,000						2,425						30,000						1,925
Water rights						29,392												29,392
Goodwill						379,646												379,593
						$	779,478					$	35,352					$	779,425					$	29,001

Of the total intangibles (net of amortization) and goodwill, $124 million is attributable to the petroleum additives segment and $620 million is attributable to the specialty materials segment. The change in the gross carrying amount between December 31, 2024 and March 31, 2025 is due to the foreign currency fluctuation on goodwill in the petroleum additives segment. See Note 2 for further information on the intangibles and goodwill obtained with the AMPAC acquisition. There is no accumulated goodwill impairment.

Amortization expense was (in thousands):

Three months ended March 31, 2025			6,351
Three months ended March 31, 2024			5,372

Estimated amortization expense for the remainder of 2025, as well as estimated annual amortization expense related to our intangible assets for the next five years, is expected to be (in thousands):

2025			$	19,053
2026			25,404
2027			25,404
2028			25,355
2029			25,214
2030			25,214

We amortize the formulas and technology over 8 years, the customer bases over 17.5 to 20 years, and the trademarks and trade names over 15 years.

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NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

9.    Long-term Debt

(in thousands)						March 31, 2025						December 31, 2024
Senior notes - 2.70% due 2031 (net of related deferred financing costs)						$	394,727					$	394,506
Senior notes - 3.78% due 2029						200,000						250,000
Term loan (net of related deferred financing costs)						249,828						249,775
Revolving credit facility						146,000						77,000
						$	990,555					$	971,281

Senior Notes - The 2.70% senior notes, which were issued in 2021, are unsecured with an aggregate principal amount of $400 million. The offer and sale of the notes were registered under the Securities Act of 1933, as amended.

The 3.78% senior notes are unsecured and were issued in a 2017 private placement with The Prudential Insurance Company of America and certain other purchasers. We made the first principal payment of $50 million on January 4, 2025 and have four remaining principal payments of $50 million due January 4 of each year through 2029.

We were in compliance with all covenants under all issuances of senior notes as of March 31, 2025 and December 31, 2024.

Term Loan Credit Agreement - The term loan credit agreement is unsecured, has a borrowing capacity of $250 million, a term of two years, and matures on January 22, 2026. We borrowed the entire $250 million available under the term loan credit agreement and are required to repay the principal amount borrowed under the term loan in full at maturity. We may, in our sole discretion and subject to the conditions set forth in the term loan credit agreement, prepay amounts borrowed under the term loan, together with any accrued and unpaid interest, prior to maturity. Any amounts prepaid prior to maturity are not available for additional borrowings by NewMarket.

We were in compliance with all covenants under the term loan credit agreement as of March 31, 2025 and December 31, 2024.

Revolving Credit Facility - The revolving credit facility has a borrowing capacity of $900 million, a term of five years, and matures on January 22, 2029. The obligations under the revolving credit facility are unsecured. The average interest rate for borrowings under the revolving credit agreement was 5.6% during the first three months of 2025 and 6.5% during the year ended December 31, 2024.

Outstanding borrowings under the revolving credit facility amounted to $146 million at March 31, 2025 and $77 million at December 31, 2024. Outstanding letters of credit amounted to approximately $4 million at both March 31, 2025 and December 31, 2024. The unused portion of the revolving credit facility amounted to $750 million at March 31, 2025 and $819 million at December 31, 2024.

We were in compliance with all covenants under the revolving credit facility as of March 31, 2025 and December 31, 2024.

10.    Commitments and Contingencies

Legal Matters

We are involved in legal proceedings that are incidental to our business and may include administrative or judicial actions. Some of these legal proceedings involve governmental authorities and relate to environmental matters. For further information, see Environmental below.

While it is not possible to predict or determine with certainty the outcome of any legal proceeding, we believe the outcome of any of these proceedings, or all of them combined, will not result in a material adverse effect on our consolidated results of operations, financial condition, or cash flows.

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NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Environmental

We are involved in environmental proceedings and potential proceedings relating to soil and groundwater contamination, disposal of hazardous waste, and other environmental matters at several of our current or former facilities, or at third-party sites where we have been designated as a potentially responsible party. While we believe we are currently adequately accrued for known environmental issues, it is possible that unexpected future costs could have a significant impact on our consolidated financial position, results of operations, and cash flows. Our total accruals for environmental remediation, dismantling, and decontamination were approximately $11 million at both March 31, 2025 and December 31, 2024. Of the total accrual, the current portion is included in accrued expenses and the noncurrent portion is included in other noncurrent liabilities on the Condensed Consolidated Balance Sheets.

Our more significant environmental sites include a former plant site in Baton Rouge, Louisiana and a Houston, Texas plant site. Together, the amounts accrued on a discounted basis related to these sites represented approximately $8 million of the total accrual above at March 31, 2025 and $9 million at December 31, 2024, using discount rates ranging from 3% to 9% for both periods. The aggregate undiscounted amount for these sites was $10 million at March 31, 2025 and $11 million at December 31, 2024.

Leases

At March 31, 2025, we had commitments of approximately $3 million for finance leases that have not yet commenced.

11.    Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Loss)

The balances of, and changes in, the components of accumulated other comprehensive income (loss), net of tax, consist of the following:

(in thousands)						Pension Plans and Other Postretirement Benefits												Foreign Currency Translation Adjustments												Accumulated Other Comprehensive (Loss) Income
Balance at December 31, 2023						$	79,966											$	(101,037)											$	(21,071)
Other comprehensive income (loss) before reclassifications						0												(6,943)												(6,943)
Amounts reclassified from accumulated other comprehensive loss (a)						(860)												0												(860)
Other comprehensive income (loss)						(860)												(6,943)												(7,803)
Balance at March 31, 2024						$	79,106											$	(107,980)											$	(28,874)
Balance at December 31, 2024						$	151,958											$	(119,088)											$	32,870
Other comprehensive income (loss) before reclassifications						0												12,515												12,515
Amounts reclassified from accumulated other comprehensive loss (a)						(1,489)												0												(1,489)
Other comprehensive income (loss)						(1,489)												12,515												11,026
Balance at March 31, 2025						$	150,469											$	(106,573)											$	43,896

(a) The pension plan and other postretirement benefit components of accumulated other comprehensive loss are included in the computation of net periodic benefit cost (income). See Note 5 in this Quarterly Report on Form 10-Q and Note 18 in our 2024 Annual Report for further information.

12.    Fair Value Measurements

The carrying amount of cash and cash equivalents in the Condensed Consolidated Balance Sheets, as well as the fair value, was $118 million at March 31, 2025 and $77 million at December 31, 2024. The fair value is classified as Level 1 in the fair value hierarchy.

No material events occurred during the three months ended March 31, 2025 requiring adjustment to the recognized balances of assets or liabilities which are recorded at fair value on a nonrecurring basis.

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NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Long-term debt – We record the carrying amount of our long-term debt at historical cost, less deferred financing costs related to our outstanding senior notes and term loan. The estimated fair value of our long-term debt is shown in the table below and is based primarily on estimated current rates available to us for debt of the same remaining duration and adjusted for nonperformance risk and credit risk. The estimated fair value of our publicly traded outstanding senior notes included in the table below is based on the last quoted price closest to March 31, 2025. The fair value of our debt instruments is classified as Level 2 in the fair value hierarchy.

						March 31, 2025												December 31, 2024
(in thousands)						Carrying Amount						Fair Value						Carrying Amount						Fair Value
Long-term debt						$	990,555					$	939,062					$	971,281					$	906,925

13.        Recent Accounting Pronouncements

In December 2023, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update No. 2023-09, "Income Taxes (Topic 740): Improvements to Income Tax Disclosures" (ASU 2023-09). The FASB issued ASU 2023-09 to enhance the transparency and decision-making usefulness of income tax disclosures by requiring additional information on an entity's tax rate reconciliation, as well as income taxes paid. ASU 2023-09 was effective for our annual reporting period beginning January 1, 2025. The required disclosures will be included in our 2025 Annual Report on Form 10-K.

In November 2024, the FASB issued Accounting Standards Update No. 2024-03, "Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses" (ASU 2024-03). The FASB issued ASU 2024-03 to improve disclosures surrounding expenses in commonly presented captions including Cost of goods sold; Selling, general, and administrative expenses; and Research, development, and testing expenses. The additional expense information required to be disclosed includes purchases of inventory, employee compensation, depreciation, intangible assets amortization, and total selling expenses, as well as a qualitative description of amounts remaining that have not been separately presented. ASU 2024-03 is effective for our annual reporting period beginning January 1, 2027, and our quarterly reporting periods beginning January 1, 2028. Early adoption is permitted. We are currently assessing the impact that the adoption of ASU 2024-03 will have on the disclosures in our consolidated financial statements.

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ITEM 2.    Management’s Discussion and Analysis of Financial Condition and Results of Operations

Forward-Looking Statements

This report contains forward-looking statements about future events and expectations within the meaning of the Private Securities Litigation Reform Act of 1995. We have based these forward-looking statements on our current expectations and projections about future results. When we use words in this document such as “anticipates,” “intends,” “plans,” “believes,” “estimates,” “projects,” “expects,” “should,” “could,” “may,” “will,” and similar expressions, we do so to identify forward-looking statements. Examples of forward-looking statements include, but are not limited to, statements we make regarding future prospects of growth in the petroleum additives or specialty materials markets, other trends in these markets, our ability to maintain or increase our market share, our future capital expenditure levels, and our future financial results.

We believe our forward-looking statements are based on reasonable expectations and assumptions, within the bounds of what we know about our business and operations. However, we offer no assurance that actual results will not differ materially from our expectations due to uncertainties and factors that are difficult to predict and beyond our control.

Factors that could cause actual results to differ materially from expectations include, but are not limited to, the availability of raw materials and distribution systems; disruptions at production facilities, including single-sourced facilities; hazards common to chemical businesses; the ability to respond effectively to technological changes in our industries; failure to protect our intellectual property rights; sudden, sharp, or prolonged raw material price increases; competition from other manufacturers; current and future governmental regulations; the loss of significant customers; termination or changes to contracts with contractors and subcontractors of the U.S. government or directly with the U.S. government; failure to attract and retain a highly-qualified workforce; an information technology system failure or security breach; the occurrence or threat of extraordinary events, including natural disasters, terrorist attacks, wars, and health-related epidemics; risks related to operating outside of the United States, including tariffs and trade policy; political, economic, and regulatory factors concerning our products; the impact of substantial indebtedness on our operational and financial flexibility; the impact of fluctuations in foreign exchange rates; resolution of environmental liabilities or legal proceedings; limitation of our insurance coverage; our inability to realize expected benefits from investment in our infrastructure or from acquisitions, or our inability to successfully integrate acquisitions into our business; the underperformance of our pension assets resulting in additional cash contributions to our pension plans; and other factors detailed from time to time in the reports that NewMarket files with the SEC, including the risk factors in Part I, Item 1A. “Risk Factors” of our 2024 Annual Report, which is available to shareholders at www.newmarket.com.

You should keep in mind that any forward-looking statement made by us in this report or elsewhere speaks only as of the date on which we make it. New risks and uncertainties arise from time to time, and it is impossible for us to predict these events or how they may affect us. We have no duty to, and do not intend to, update or revise the forward-looking statements in this discussion after the date hereof, except as may be required by law. In light of these risks and uncertainties, any forward-looking statement made in this report or elsewhere, might not occur.

Overview

When comparing the results of the petroleum additives segment for the first three months of 2025 with the first three months of 2024, net sales declined 4.7%, resulting primarily from lower product shipments, which were partially offset by favorable product mix. Petroleum additives operating profit decreased 5.8% when comparing the 2025 and 2024 three-months periods, primarily reflecting lower product shipments and higher operating costs, which were partially offset by lower raw material costs and favorable product mix.

The specialty materials segment reported both higher net sales and higher operating profit for the first three months of 2025 as compared to the same period in 2024, resulting primarily from higher product volumes, as well as favorable product mix. Specialty materials sales and operating profit for the first three months of 2024 reflect financial results since the acquisition of AMPAC on January 16, 2024.

We are monitoring the uncertain macroeconomic environment in which we operate, particularly the changes in international trade relations and tariffs, and are assessing the potential impacts to our operations. These impacts could include supply chain disruptions, lower customer demand, and higher inflation. Investing in technology to meet customer needs, enhancing our operational efficiency, and improving our portfolio profitability will remain priorities throughout 2025.

Despite the challenging economic environment, our financial position remains strong. We have sufficient access to capital, if needed, and do not anticipate any issues with meeting the covenants for all our debt agreements for the foreseeable future.

Our business typically generates significant amounts of cash beyond its operational needs. We continue to invest in and manage our business for the long-term with the goal of helping our customers succeed in their marketplaces. Our investments continue to be in organizational talent, technology development and processes, and global infrastructure.

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Results of Operations

Net Sales

Consolidated net sales for the first three months of 2025 totaled $700.9 million, representing a slight increase of $4.2 million, or 0.6%, from the first three months of 2024. The following table shows net sales by segment and product line. The net sales for the first three months of 2024 in the table below for the specialty materials segment include sales since the acquisition of AMPAC on January 16, 2024.

												Three Months Ended March 31,
(in millions)																		2025						2024
Petroleum additives
Lubricant additives																		$	559.2					$	571.9
Fuel additives																		86.3						105.4
Total																		645.5						677.3
Specialty materials																		53.7						17.0
All other																		1.7						2.4
Net sales																		$	700.9					$	696.7

Petroleum Additives Segment

The regions in which we operate include North America, Latin America, Asia Pacific, and EMEAI. While there is some fluctuation, the percentage of net sales generated by region remained fairly consistent when comparing the first three months of 2025 with both the same period in 2024, as well as with the full year of 2024.

Petroleum additives net sales for the first three months of 2025 were $645.5 million compared to $677.3 million for the first three months of 2024, a decrease of 4.7% across all regions. The Asia Pacific region decreased 8.5%, EMEAI decreased 5.9%, North America decreased 2.2%, and Latin America decreased 1.0%.

The following table details the approximate components of the changes in petroleum additives net sales between the first three months of 2025 and 2024.

(in millions)												Three Months
Period ended March 31, 2024												$	677.3
Lubricant additives shipments												(19.2)
Fuel additives shipments												(21.2)
Selling prices, including product mix												14.0
Foreign currency impact, net												(5.4)
Period ended March 31, 2025												$	645.5

When comparing the first three months of 2025 and 2024, the decrease in petroleum additives net sales was due to lower product shipments, along with a small unfavorable foreign currency impact. Partially offsetting these factors was an increase to net sales driven by favorable product mix.

The primary foreign currencies in which we transact include the Euro, Pound Sterling, Japanese Yen, Chinese Renminbi, and Indian Rupee. Comparing the first three months of 2025 and 2024, the United States Dollar strengthened against all of the major currencies in which we transact, resulting in the unfavorable impact to net sales for the first three months comparison reflected in the above table. The unfavorable impact was predominantly from the change in the exchange rate of the Euro.

On a worldwide basis, the volume of product shipments for petroleum additives decreased 7.2% when comparing the first three months periods with decreases in both lubricant and fuel additives. Both the North America and Asia Pacific regions experienced decreases in lubricant additives shipments, while the EMEAI and Latin America regions reported small increases in lubricant additives shipments. All regions except Asia Pacific experienced decreases in fuel additives shipments for the first three months comparison.

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Specialty Materials Segment

Total net sales were $53.7 million for the first three months of 2025 and $17.0 million for the period that we owned AMPAC during the first three months of 2024. The increase in net sales was the result of significantly higher product volume, along with higher selling prices, including favorable product mix.

All Other

The “All other” category includes the operations of the antiknock compounds business, as well as certain contracted manufacturing and related services associated with Ethyl.

Segment Operating Profit

NewMarket evaluates the performance of the petroleum additives and specialty materials businesses based on segment operating profit. NewMarket Services Corporation expenses are charged to NewMarket and each subsidiary pursuant to services agreements between the companies. Depreciation of segment property, plant, and equipment, as well as amortization of segment intangible assets and lease right-of-use assets, is included in segment operating profit.

The following table reports segment operating profit for the three months ended March 31, 2025 and March 31, 2024. The amount reported for specialty materials is for the period from January 16, 2024 to March 31, 2024. A reconciliation of segment operating profit to income before income tax expense is in Note 4.

												Three Months Ended March 31,
(in millions)																		2025						2024
Petroleum additives																		$	142.1					$	150.9
Specialty materials																		$	23.2					$	(5.0)
All other																		$	(0.5)					$	(0.1)

Petroleum Additives Segment

Petroleum additives segment gross profit decreased $6.5 million and operating profit decreased $8.8 million when comparing the first three months of 2025 to the first three months of 2024.

The decrease in both gross profit and operating profit included the unfavorable impacts of lower product shipments and higher operating costs, which were partially offset by favorable product mix and lower raw material costs.

The following table presents petroleum additives cost of goods sold as a percentage of net sales and the operating profit margin.

    

												Three Months Ended March 31,
																		2025						2024
Cost of goods sold as a percentage of net sales																		67.8		%				68.4		%
Operating profit margin																		22.0		%				22.3		%

For the rolling four quarters ended March 31, 2025, the operating profit margin for petroleum additives was 22.4%, which is within our historical range of operating profit margin. While operating margins will fluctuate from quarter to quarter due to multiple factors, we believe the fundamentals of our business and industry as a whole are unchanged.

Petroleum additives selling, general, and administrative (SG&A) expenses for the first three months of 2025 were $0.3 million higher than the first three months of 2024. SG&A expenses as a percentage of net sales were 5.0% for the first three months of 2025 and 4.8% for the first three months of 2024. Our SG&A costs are primarily personnel-related and include salaries, benefits, and other costs associated with our workforce, including travel-related expenses. While personnel-related costs fluctuate from period to period, there were no significant changes in the drivers of these costs when comparing the periods.

Our investment in petroleum additives research, development, and testing (R&D) increased $2.0 million when comparing the first three months periods of 2025 and 2024. As a percentage of net sales, our R&D investment was 5.1% for the first three months of 2025 and 4.6% for the first three months of 2024. Our R&D investments reflect our efforts to support the development of solutions that meet our customers' needs, meet new and evolving standards, and support our expansion into new product areas. Our approach to R&D investments, as it is with SG&A costs, is one of purposeful spending on programs to

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support our current product base and to ensure that we develop products to support our customers' programs in the future. R&D investments include personnel-related costs, as well as costs for internal and external testing of our products.

Specialty Materials Segment

The specialty materials segment reported operating profit of $23.2 million for the first three months of 2025 as compared to an operating loss of $5.0 million for the period from the AMPAC acquisition date of January 16, 2024 to March 31, 2024. The increase in specialty materials operating profit was primarily the result of the same factors discussed in the Net Sales section above.

The specialty materials results for the 2024 period include the sale of AMPAC finished goods inventory that we acquired at closing. The acquired inventory was recorded at fair value on the acquisition date and sold during 2024, generating no margin.

We may experience substantial variation in quarterly results for the specialty materials segment on an ongoing basis due to the nature of its business.

The following discussion references certain captions on the Consolidated Statements of Income.

Interest and Financing Expenses, Net

Interest and financing expenses were $10.7 million for the first three months of 2025 and $15.7 million for the first three months of 2024.

The decrease for the three months comparisons resulted primarily from both lower average debt outstanding and a lower average interest rate.

Other Income (Expense), Net

Other income (expense), net was income of $14.9 million for the first three months of 2025 and $12.5 million for the first three months of 2024. The amounts for both the 2025 and 2024 three months periods primarily reflect the components of net periodic benefit cost (income), except for service cost, from defined benefit pension and postretirement plans. See Note 5 for further information on total periodic benefit cost (income).

Income Tax Expense

Income tax expense was $38.2 million for the first three months of 2025 and $30.0 million for the first three months of 2024. The effective tax rate was 23.3% for the first three months of 2025 and 21.8% for the first three months of 2024. Income tax expense increased $5.7 million due to higher income before income tax expense and $2.5 million due to the higher effective tax rate.

The increase in the effective tax rate for the first three months comparison was primarily caused by prior year tax items.

Cash Flows, Financial Condition, and Liquidity

Cash and cash equivalents at March 31, 2025 were $118.3 million, an increase of $40.8 million since December 31, 2024.

Cash and cash equivalents held by our foreign subsidiaries amounted to $114.3 million at March 31, 2025 and $71.3 million at December 31, 2024. Periodically, we repatriate cash from our foreign subsidiaries to the United States through intercompany dividends and loans. We do not anticipate significant tax consequences from future distributions of foreign earnings.

A portion of our foreign cash balances is associated with earnings that we have asserted are indefinitely reinvested. We plan to use these indefinitely reinvested earnings to support growth outside of the United States through funding of operating expenses, research and development expenses, capital expenditures, and other cash needs of our foreign subsidiaries.

We expect that cash from operations, together with borrowing available under our revolving credit facility, will continue to be sufficient to cover our operating needs including planned short-term and long-term capital expenditures.

Cash Flows – Operating Activities

Cash provided from operating activities for the first three months of 2025 was $120.3 million, including $26.6 million of higher working capital requirements. The $26.6 million excluded an unfavorable foreign currency impact to the components of working capital on the balance sheet.

When comparing the March 31, 2025 balances with those at December 31, 2024, the most significant changes in working capital included increases in trade and other accounts receivable, accounts payable, and income taxes payable, along with decreases in inventories and accrued expenses. The increase in trade and other accounts receivable primarily reflects higher

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sales during the first quarter of 2025 compared to the fourth quarter of 2024. The increase in accounts payable is primarily the result of increased purchases during the first quarter of 2025 and normal invoice payment timing. The increase in income taxes payable is due to the timing of U.S. income tax payments. The decrease in inventory reflects lower production to allow for customer demand, as well as the planned use of inventory built up during the end of 2024 to provide for normal maintenance outages. The decrease in accrued expenses is primarily the result of normal payments related to customer rebates, interest payments on our long-term debt, and personnel-related payments.

Including cash and cash equivalents, as well as the impact of changes in foreign currency exchange rates on the balance sheet, we had total working capital of $727.5 million at March 31, 2025 and $655.1 million at December 31, 2024. The current ratio was 2.84 at March 31, 2025 and 2.75 at December 31, 2024.

Cash Flows – Investing Activities

Cash used in investing activities totaled $13.0 million during the first three months of 2025, comprised of capital expenditures. We expect that our total capital spending during 2025 will be in the $70 million to $100 million range and will include improvements to our manufacturing and R&D infrastructure around the world.

Included in the expected capital expenditures for 2025 is a capital investment of up to $100 million to expand AMPAC's ammonium perchlorate production capabilities in support of growing solid rocket motor demand. This anticipated investment, which has been approved by the AMPAC board of directors, will include the construction of an additional production line, increasing capacity by more than 50%. The increased capacity will allow AMPAC to meet the demand of U.S. military and space launch programs, while also addressing the needs of U.S. allies in these critical areas. The project remains subject to approval by NewMarket’s board of directors and is currently scheduled to be completed during 2026.

We expect to continue to finance capital spending through cash on hand and cash provided from operations, together with borrowing available under our revolving credit facility.

Cash Flows – Financing Activities

Cash used in financing activities during the first three months of 2025 amounted to $68.5 million. These cash flows included repurchases of our common stock of $57.1 million, a principal payment of $50.0 million on the 3.78% senior notes, and cash dividends of $26.1 million, which were partially offset by net borrowings of $69 million on the revolving credit facility.

Debt

Our long-term debt was $990.6 million at March 31, 2025 compared to $971.3 million at December 31, 2024.

See Note 9 for additional information on the 2.70% senior notes, 3.78% senior notes, term loan, and revolving credit facility, including the unused portion of our revolving credit facility.

All of our senior notes, the term loan, and the revolving credit facility contain covenants, representations, and events of default that management considers typical of credit arrangements of this nature. The covenants under the 3.78% senior notes, as well as the term loan, include negative covenants, certain financial covenants, and events of default which are substantially similar to the covenants and events of default in our revolving credit facility.

The revolving credit facility contains financial covenants that require NewMarket to maintain a consolidated Leverage Ratio (as defined in the agreement) of no more than 3.75 to 1.00, except during an Increased Leverage Period (as defined in the agreement) at the end of each quarter. At March 31, 2025, the Leverage Ratio was 1.31 under the revolving credit facility.

At March 31, 2025, we were in compliance with all covenants under the 3.78% senior notes, 2.70% senior notes, term loan, and revolving credit facility.

As a percentage of total capitalization (total long-term debt and shareholders’ equity), our total long-term debt decreased from 39.9% at December 31, 2024 to 39.5% at March 31, 2025. The change resulted from the increase in shareholders' equity partially offset by a net increase in outstanding long-term debt. The increase in shareholders’ equity primarily reflects our earnings and favorable impact from foreign currency translation adjustments, partially offset by dividend payments and repurchases of shares of our common stock. Generally, we repay any outstanding long-term debt with cash from operations or refinancing activities.

Critical Accounting Policies and Estimates

This Form 10-Q and our 2024 Annual Report include discussions of our accounting policies, as well as methods and estimates used in the preparation of our financial statements. We also provided a discussion of Critical Accounting Policies and Estimates in our 2024 Annual Report.

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There have been no significant changes in our critical accounting policies and estimates from those reported in our 2024 Annual Report.

Recent Accounting Pronouncements

For a full discussion of the more significant recently issued accounting standards, see Note 13.

Outlook

Our goal is to provide a 10% compounded return per year for our shareholders over any ten-year period (defined as earnings per share growth plus dividend yield), although we may not necessarily achieve a 10% return each year. We continue to have confidence in our customer-focused strategy and approach to the market. We believe the fundamentals of how we run our business - a long-term view, safety-first culture, customer-focused solutions, technology-driven product offerings, and world-class supply chain capability - will continue to be beneficial for all of our stakeholders over the long term.

Our petroleum additives segment may experience impacts to its operating performance during 2025 due to the uncertain global economic environment in which we operate; however, we anticipate continued strength from this segment. As a result, we will continue to focus on cost control and operating profit margin management throughout the year. We expect over the long-term that the petroleum additives market will grow annually up to 2%. We plan to exceed that growth rate in our petroleum additives segment.

Over the past several years we have made significant investments in our petroleum additives business as the industry fundamentals remain positive. These investments have been, and will continue to be, focused on operational efficiencies, organizational talent, and technology development and processes, as well as global infrastructure, including technical centers, production capabilities and geographic expansion. We intend to utilize these investments to improve our ability to deliver the solutions that our customers value, expand our global reach, and enhance our operating results. We will continue to invest in our capabilities to provide even better value, service, technology, and customer solutions.

We continue to focus on the ongoing integration of AMPAC into our business. While we may experience substantial variation in quarterly results for specialty materials on an ongoing basis due to the nature of its business, we anticipate full year results to be consistent with our pre-acquisition expectations. Our planned investment to expand capacity at AMPAC is aligned with anticipated future industry demand.

Our business typically generates significant amounts of cash beyond its operational needs. We regularly review our many internal opportunities to utilize excess cash from technological, geographic, production capability, and product line perspectives. We believe our capital spending is creating the capability we need to grow and support our customers worldwide, and our research and development investments are positioning us well to provide added value to our customers.

While our AMPAC acquisition was outside of our core petroleum additives business, we believe it presented an excellent opportunity to provide long-term value for our shareholders. Nonetheless, our primary focus in the acquisition area remains on the petroleum additives industry. It is our view that the petroleum additives industry will provide the greatest opportunity for solid returns on our investments while minimizing risk. We remain focused on this strategy and will evaluate any future opportunities. We will continue to evaluate all alternative uses of cash to enhance shareholder value, including stock repurchases and dividends.

ITEM 3.     Quantitative and Qualitative Disclosures About Market Risk

At March 31, 2025, there were no material changes in our market risk from the information provided in the 2024 Annual Report.

ITEM 4.     Controls and Procedures

Evaluation of Disclosure Controls and Procedures

We maintain a system of internal control over financial reporting to provide reasonable, but not absolute, assurance of the reliability of the financial records and the protection of assets. Under Rule 13a-15(b) of the Securities Exchange Act of 1934 (the Exchange Act), we carried out an evaluation, with the participation of our management, including our principal executive officer and our principal financial officer, of the effectiveness of our disclosure controls and procedures, as such term is defined in Rule 13a-15(e) of the Exchange Act, as of the end of the period covered by this report. Based upon that evaluation, our principal executive officer and our principal financial officer concluded that our disclosure controls and procedures were effective at the reasonable assurance level.

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There has been no change in our internal control over financial reporting, as such term is defined in Rule 13a-15(f) of the Exchange Act, which occurred during the quarter ended March 31, 2025 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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PART II.     OTHER INFORMATION

ITEM 1.     Legal Proceedings

There have been no material changes to our legal proceedings as disclosed in "Legal Proceedings" in Item 3 of Part I of the 2024 Annual Report.

ITEM 2.    Unregistered Sales of Equity Securities and Use of Proceeds

On December 12, 2024, our Board of Directors approved a share repurchase program authorizing management to repurchase up to $500 million of NewMarket's outstanding common stock beginning January 1, 2025 and until December 31, 2027, as market conditions warrant and covenants under our existing debt agreements permit. We may conduct the share repurchases in the open market, in privately negotiated transactions, through block trades, or pursuant to trading plans intended to comply with Rule 10b5-1 and/or Rule 10b-18 of the Securities Exchange Act of 1934. The repurchase program does not require us to acquire any specific number of shares and may be terminated or suspended at any time.

The following table outlines the purchases during the first quarter of 2025 under the authorization.

Issuer Purchases of Equity Securities

Period						Total Number of Shares Purchased						Average Price Paid per Share						Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs						Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs
January 1 to January 31						0						$	0.00					0						$	500,000,000
February 1 to February 28						39,081						528.36						39,081						479,351,207
March 1 to March 31						57,765						542.76						57,765						447,998,582
Total						96,846						$	536.95					96,846						$	447,998,582

ITEM 5.    Other Information

During the quarter ended March 31, 2025, no director or officer (as defined in Rule 16a-1(f) under the Exchange Act) of NewMarket Corporation adopted or terminated a "Rule 10b5-1 trading arrangement" or "non-Rule 10b5-1 trading arrangement," as each term is defined in Item 408(a) or Regulation S-K.

ITEM 6.     Exhibits

 

Exhibit 3.1			Articles of Incorporation Amended and Restated effective April 27, 2012 (incorporated by reference to Exhibit 3.1 to Form 8-K (File No. 1-32190) filed April 30, 2012)
Exhibit 3.2			NewMarket Corporation Bylaws Amended and Restated effective August 6, 2015 (incorporated by reference to Exhibit 3.1 to Form 8-K (File No. 1- 32190) filed August 6, 2015)
Exhibit 31(a)			Certification pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 by Thomas E. Gottwald
Exhibit 31(b)			Certification pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 by Timothy K. Fitzgerald
Exhibit 32(a)			Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 by Thomas E. Gottwald
Exhibit 32(b)			Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 by Timothy K. Fitzgerald
Exhibit 101			Inline XBRL Instance Document and Related Items (the instance document does not appear in the Interactive Data File because its Inline XBRL tags are embedded within the Inline XBRL document)
Exhibit 104			Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

 

			NEWMARKET CORPORATION
			(Registrant)
Date: April 24, 2025			By: /s/ Timothy K. Fitzgerald
			Timothy K. Fitzgerald
			Vice President and
			Chief Financial Officer
			(Principal Financial Officer)
Date: April 24, 2025			By: /s/ Ann P. Pietrantoni
			Ann P. Pietrantoni
			Controller
			(Principal Accounting Officer)

27

Exhibit 31(a)

CERTIFICATION

I, Thomas E. Gottwald, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q for the quarter ended March 31, 2025 of NewMarket Corporation;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: April 24, 2025
			By:			/s/ Thomas E. Gottwald
			Thomas E. Gottwald
			Chairman of the Board, President, and Chief Executive Officer

Exhibit 31(b)

CERTIFICATION

I, Timothy K. Fitzgerald, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q for the quarter ended March 31, 2025 of NewMarket Corporation;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: April 24, 2025
			By:			/s/ Timothy K. Fitzgerald
			Timothy K. Fitzgerald
			Vice President and Chief Financial Officer

Exhibit 32(a)

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of NewMarket Corporation (the “Company”) for the period ending March 31, 2025 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Thomas E. Gottwald, chief executive officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

1.the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d)); and

2.the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

 

By:			/s/ Thomas E. Gottwald
Thomas E. Gottwald
Chairman of the Board, President, and Chief Executive Officer
Date: April 24, 2025

Exhibit 32(b)

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of NewMarket Corporation (the “Company”) for the period ending March 31, 2025 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Timothy K. Fitzgerald, chief financial officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

1.the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d)); and

2.the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

 

By:			/s/ Timothy K. Fitzgerald
Timothy K. Fitzgerald
Vice President and Chief Financial Officer
Date: April 24, 2025

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v3.25.1

Consolidated Statements Of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Income Statement [Abstract]
Net sales	$ 700,946	$ 696,736
Cost of goods sold	464,923	480,371
Gross profit	236,023	216,365
Selling, general, and administrative expenses	42,978	44,365
Research, development, and testing expenses	33,176	31,200
Operating profit	159,869	140,800
Interest and financing expenses, net	10,700	15,654
Other income (expense), net	14,944	12,547
Income before income tax expense	164,113	137,693
Income tax expense	38,164	29,961
Net income	$ 125,949	$ 107,732
Earnings per share - basic (in dollars per share)	$ 13.26	$ 11.23
Earnings per share - diluted (in dollars per share)	13.26	11.23
Cash dividends declared per share (in dollars per share)	$ 2.75	$ 2.50

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v3.25.1

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 125,949	$ 107,732
Pension plans and other postretirement benefits:
Amortization of prior service cost (credit) included in net periodic benefit cost (income), net of income tax expense (benefit) of $(177) in the first quarter 2025 and $(174) in the first quarter 2024	(500)	(502)
Amortization of actuarial net loss (gain) included in net periodic benefit cost (income), net of income tax expense (benefit) of $(341) in the first quarter 2025 and $(122) in the first quarter 2024	(989)	(358)
Total pension plans and other postretirement benefits	(1,489)	(860)
Foreign currency translation adjustments, net of income tax expense (benefit) of $496 in the first quarter 2025 and $(238) in the first quarter 2024	12,515	(6,943)
Other comprehensive income (loss)	11,026	(7,803)
Comprehensive income	$ 136,975	$ 99,929

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v3.25.1

Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Amortization of prior service cost (credit) included in net periodic benefit cost (income), income tax expense (benefit)	$ (177)	$ (174)
Amortization of actuarial net loss (gain) included in net periodic benefit cost (income), income tax expense (benefit)	(341)	(122)
Foreign currency translation adjustments, income tax expense (benefit)	$ 496	$ (238)

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v3.25.1

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 118,253	$ 77,476
Trade and other accounts receivable, less allowance for credit losses	463,337	395,450
Inventories	489,759	505,426
Prepaid expenses and other current assets	52,415	51,203
Total current assets	1,123,764	1,029,555
Property, plant, and equipment, net	734,580	735,361
Intangibles (net of amortization) and goodwill	744,126	750,424
Prepaid pension cost	503,042	490,418
Operating lease right-of-use assets, net	75,197	71,253
Deferred charges and other assets	52,215	52,530
Total assets	3,232,924	3,129,541
Current liabilities:
Accounts payable	249,757	225,874
Accrued expenses	70,463	89,277
Dividends payable	21,698	22,037
Income taxes payable	32,261	15,798
Operating lease liabilities	16,303	15,337
Other current liabilities	5,775	6,155
Total current liabilities	396,257	374,478
Long-term debt	990,555	971,281
Operating lease liabilities-noncurrent	58,100	54,754
Other noncurrent liabilities	268,516	267,445
Total liabilities	1,713,428	1,667,958
Commitments and contingencies (Note 10)
Shareholders’ equity:
Common stock and paid-in capital (with no par value; authorized shares - 80,000,000; issued and outstanding shares - 9,434,506 at March 31, 2025 and 9,524,789 at December 31, 2024)	0	0
Accumulated other comprehensive income	43,896	32,870
Retained earnings	1,475,600	1,428,713
Total shareholders’ equity	1,519,496	1,461,583
Total liabilities and shareholders’ equity	$ 3,232,924	$ 3,129,541

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v3.25.1

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2025	Dec. 31, 2024
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	80,000,000	80,000,000
Common stock, shares issued (in shares)	9,434,506	9,524,789
Common stock, shares outstanding (in shares)	9,434,506	9,524,789

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v3.25.1

Consolidated Statements Of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock and Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings [Member]
Balance (in shares) at Dec. 31, 2023		9,590,086
Balance at Dec. 31, 2023	$ 1,077,061	$ 2,130	$ (21,071)	$ 1,096,002
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	107,732			107,732
Other comprehensive income (loss)	(7,803)		(7,803)
Cash dividends	(23,986)			(23,986)
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation		(1,816)
Tax withholdings related to stock-based compensation	(1,118)	$ (1,118)
Restricted Stock Award, Forfeitures, Dividends				(8)
Stock-based compensation (in shares)		5,980
Stock-based compensation	402	$ 394
Balance (in shares) at Mar. 31, 2024		9,594,250
Balance at Mar. 31, 2024	$ 1,152,288	$ 1,406	(28,874)	1,179,756
Balance (in shares) at Dec. 31, 2024	9,524,789	9,524,789
Balance at Dec. 31, 2024	$ 1,461,583	$ 0	32,870	1,428,713
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	125,949			125,949
Other comprehensive income (loss)	11,026		11,026
Cash dividends	(26,057)			(26,057)
Stock Repurchased and Retired During Period, Shares		(96,846)
Stock Repurchased and Retired During Period, Value	(52,491)	$ (488)		(52,003)
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation		(1,846)
Tax withholdings related to stock-based compensation	(1,002)	$ 0		(1,002)
Restricted Stock Award, Forfeitures, Dividends				0
Stock-based compensation (in shares)		8,409
Stock-based compensation	$ 488	$ 488
Balance (in shares) at Mar. 31, 2025	9,434,506	9,434,506
Balance at Mar. 31, 2025	$ 1,519,496	$ 0	$ 43,896	$ 1,475,600

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v3.25.1

Consolidated Statements Of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Statement of Stockholders' Equity [Abstract]
Cash dividends (in dollars per share)	$ 2.75	$ 2.50

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v3.25.1

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Statement of Cash Flows [Abstract]
Cash and cash equivalents at beginning of year	$ 77,476	$ 111,936
Cash flows from operating activities:
Net income	125,949	107,732
Adjustments to reconcile net income to cash provided from operating activities:
Depreciation and amortization	28,778	25,807
Deferred income tax expense (benefit)	505	(3,899)
Working capital changes	(26,590)	(21,434)
Cash pension and postretirement contributions	(2,374)	(2,727)
Other, net	(5,955)	(2,640)
Cash provided from (used in) operating activities	120,313	102,839
Cash flows from investing activities:
Capital expenditures	(13,016)	(13,564)
Acquisition of business (net of $15,580 of cash acquired)	0	(683,924)
Cash provided from (used in) investing activities	(13,016)	(697,488)
Cash flows from financing activities:
Net borrowings under revolving credit facility	69,000	386,000
Repayments of Long-Term Debt	(50,000)	0
Repurchases of common stock	(57,064)	0
Dividends paid	(26,057)	(23,986)
Proceeds from term loan	0	250,000
Debt issuance costs	0	(2,251)
Other, net	(4,345)	(8,372)
Cash provided from (used in) financing activities	(68,466)	601,391
Effect of foreign exchange on cash and cash equivalents	1,946	(1,612)
Increase in cash and cash equivalents	40,777	5,130
Cash and cash equivalents at end of period	$ 118,253	$ 117,066

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- Definition Other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities that are not separately disclosed in the statement of cash flows (for example, cash received or cash paid during the current period for miscellaneous operating activities, net change during the reporting period in other assets or other liabilities). + References No definition available. + Details Name: us-gaap_OtherOperatingActivitiesCashFlowStatement Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details Name: us-gaap_PaymentsForRepurchaseOfCommonStock Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition The cash outflow for loan and debt issuance costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details Name: us-gaap_PaymentsOfFinancingCosts Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + Details Name: us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + Details Name: us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Amount of cash outflow for pension and other postretirement benefits. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 25 -Subparagraph (g) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-25 + Details Name: us-gaap_PensionAndOtherPostretirementBenefitContributions Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 + Details Name: us-gaap_ProceedsFromIssuanceOfUnsecuredDebt Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Amount of cash inflow (outflow) from financing activities classified as other. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 45 -Paragraph 15 -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details Name: us-gaap_ProceedsFromPaymentsForOtherFinancingActivities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets). + References No definition available. + Details Name: us-gaap_ProceedsFromRepaymentsOfLinesOfCredit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(i)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479886/946-10-S99-3 + Details Name: us-gaap_RepaymentsOfLongTermDebt Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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v3.25.1

Condensed Consolidated Statements of Cash Flows (Parenthetical) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)
Cash Acquired from Acquisition	$ 15,580

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v3.25.1

Financial Statement Presentation	3 Months Ended
	Mar. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Financial Statement Presentation	Financial Statement Presentation In the opinion of management, the accompanying consolidated financial statements of NewMarket Corporation and its subsidiaries contain all necessary adjustments for the fair presentation of, in all material respects, our consolidated financial position as of March 31, 2025 and December 31, 2024, our consolidated results of operations, comprehensive income, and changes in shareholders' equity for the three months ended March 31, 2025 and March 31, 2024, and our cash flows for the three months ended March 31, 2025 and March 31, 2024. All adjustments are of a normal, recurring nature, unless otherwise disclosed. These financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) for interim financial information and the instructions to Rule 10-01 of Regulation S-X of the Securities and Exchange Commission (SEC), but do not include all disclosures required by GAAP for complete annual consolidated financial statements. These financial statements should be read in conjunction with the consolidated financial statements and related notes included in the NewMarket Corporation Annual Report on Form 10-K for the year ended December 31, 2024 (2024 Annual Report), as filed with the SEC. The results of operations for the three-month period ended March 31, 2025 are not necessarily indicative of the results to be expected for the full year ending December 31, 2025. Unless the context otherwise indicates, all references to “we,” “us,” “our,” the “company,” and “NewMarket” are to NewMarket Corporation and its consolidated subsidiaries. Supplier Finance Program We offer our vendors a supplier finance program, which allows our vendors to receive payment from a third-party finance provider earlier than our normal payment terms would provide. NewMarket and its subsidiaries are not a party to any arrangement between our vendors and the finance provider, and there are no assets pledged as security or other forms of guarantees provided by NewMarket to the finance provider. For those vendors who opt to participate in the program, we pay the finance provider the full amount of the invoices on the normal due date. At both March 31, 2025 and December 31, 2024, the amount of confirmed invoices under the supplier finance program was not material.
Supplier Finance Program	We offer our vendors a supplier finance program, which allows our vendors to receive payment from a third-party finance provider earlier than our normal payment terms would provide. NewMarket and its subsidiaries are not a party to any arrangement between our vendors and the finance provider, and there are no assets pledged as security or other forms of guarantees provided by NewMarket to the finance provider. For those vendors who opt to participate in the program, we pay the finance provider the full amount of the invoices on the normal due date.

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- Definition The entire disclosure for supplier finance program. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 405 -SubTopic 50 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/405-50/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 405 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479468/405-50-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 405 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479468/405-50-50-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 405 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479468/405-50-50-3 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 405 -SubTopic 50 -Name Accounting Standards Codification -Section 55 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477128/405-50-55-3 + Details Name: us-gaap_SupplierFinanceProgramTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.25.1

Acquisition of Business	3 Months Ended
	Mar. 31, 2025
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Schedule of Business Acquisitions, by Acquisition	Acquisition of Business On January 16, 2024, we completed the acquisition of all issued and outstanding ownership units of AMPAC Intermediate Holdings, LLC, the ultimate parent company of American Pacific Corporation (AMPAC), for approximately $697 million. Based in Cedar City, Utah, AMPAC has one operating facility from which it manufactures and sells critical specialty materials primarily used in solid rocket motors for space launch and military defense applications. AMPAC is qualified on many NASA and Department of Defense programs and has been serving space launch and national defense programs for more than 60 years. The acquisition of AMPAC expands our presence in mission-critical, resilient sectors. It was funded by cash on hand and borrowings under our then existing revolving credit facility. The purchase consideration was subject to a customary post-closing adjustment for working capital, which was finalized during the second quarter of 2024. The fair values of the assets acquired and the liabilities assumed in the AMPAC acquisition are as follows (in millions): Cash and cash equivalents $ 16  Trade and other accounts receivable, net 6  Inventories 25  Prepaid expenses and other current assets 3  Property, plant, and equipment, net 111  Intangibles and goodwill 650  Deferred charges and other assets 5  Accounts payable (3) Accrued expenses (5) Other noncurrent liabilities (111) Fair value of net assets acquired $ 697  Identified intangible assets acquired consisted of the following (in millions): Fair Value Estimated Useful Lives (in years) Customer base $ 275  17.5 Formulas and technology 60  8 Trademarks and trade names 30  15 Water rights 29  indefinite $ 394  As part of the acquisition, we recorded $256 million of goodwill. The goodwill recognized is attributable to increased access to mission-critical, resilient sectors with a role in global safety, security, and space exploration, as well as the value of the skilled assembled workforce of AMPAC. All of the goodwill recognized is part of the specialty materials segment, and none of the goodwill is deductible for income tax purposes. The allocation of the purchase price of AMPAC to the tangible and intangible assets acquired and liabilities assumed was developed using estimates of fair value. Acquisition-related charges of $1 million consisted primarily of legal and professional fees and are included in selling, general, and administrative expenses in our Consolidated Statements of Income for the three months ended March 31, 2024. We accounted for this acquisition using the acquisition method of accounting for business combinations under the provisions of Financial Accounting Standards Board (FASB) Accounting Standard Codification (ASC) Topic 805, Business Combinations and have included the results of operations of the acquired business from the date of acquisition in our Consolidated Statements of Income as well as in the specialty materials segment in Note 4. These results include a charge related to the sale of finished goods inventory acquired, which was recorded at fair value on the acquisition date and sold to customers during 2024. The following table presents the financial results in thousands for AMPAC from the date of acquisition through March 31, 2024 (in thousands). AMPAC January 16 to March 31, 2024 Net sales $ 17,047  Loss before income taxes (5,001) The following table presents our estimated unaudited pro forma consolidated results for the three months ended March 31, 2024, assuming the acquisition of AMPAC had occurred on January 1, 2023. The unaudited pro forma information is presented for informational purposes only and is not indicative of the results of operations that would have been realized if the acquisition had been completed at the beginning of 2023, nor is it indicative of expected results for any future period. In addition, no effect is given to any future synergistic benefits that could result from the integration of AMPAC into NewMarket. Unaudited pro forma information for the three months ended March 31, 2024 includes adjustments to depreciation and amortization based upon the fair value allocation of the purchase price to AMPAC's tangible and intangible assets acquired and liabilities assumed as though the acquisition had occurred on January 1, 2023, as well as adjustments for debt-related costs and management fees. The acquisition-related costs and the charge related to the fair value adjustment to acquisition-date inventory were recognized in actual results during the three months ended March 31, 2024, but for the presentation below, these costs are excluded from 2024 unaudited pro forma income before income taxes since on a pro forma basis, they would have been incurred during 2023. Pro Forma Supplemental Information (unaudited) (in thousands) Consolidated Three Months Ended March 31, 2024 Net sales $ 701,836  Income before income taxes 140,004

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v3.25.1

Net Sales	3 Months Ended
	Mar. 31, 2025
Revenue from Contract with Customer [Abstract]
Net Sales	Net Sales Our revenues are predominantly derived from the manufacture and sale of petroleum additives products. We sell petroleum additives products across the world to customers located in the North America (the United States and Canada), Latin America (Mexico, Central America, and South America), Asia Pacific, and EMEAI (Europe/Middle East/Africa/India) regions. Our petroleum additives customers primarily consist of global, national, and independent oil companies. Our petroleum additives contracts generally include one performance obligation, which is satisfied at a point in time when products are shipped, delivered, or consumed by the customer, depending on the underlying contracts. Additionally, we have revenue from the manufacture and sale of critical specialty materials products used primarily in solid rocket motors for space launch and military defense applications. The sale of specialty materials products is predominantly to customers located in the United States, with limited amounts to customers in other countries. Our specialty materials customers are primarily contractors or subcontractors of the U.S. government. Specialty materials contracts generally include one performance obligation, which is typically satisfied at a point in time when the products are shipped from the plant site. In limited cases, we collect funds in advance of shipping product to our customers and recognizing the related revenue. These prepayments from customers are recorded as a contract liability until we recognize the revenue. Some of our contracts also include variable consideration in the form of rebates, tiered pricing, and/or business development funds. We regularly review these and make adjustments when necessary, recognizing the full amount of any adjustment in the period identified. The following table provides information on our net sales by geographic area. Information on net sales by segment is presented in Note 4. Three Months Ended March 31, (in thousands) 2025 2024 Net sales United States $ 270,876  $ 248,236  Europe, Middle East, Africa, India 201,676  208,939  Asia Pacific 147,436  156,099  Other foreign 80,958  83,462  Net sales $ 700,946  $ 696,736

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-9 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-10 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-15 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-12 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-12 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-12 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-12 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-12 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-13 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Topic 606 -Publisher FASB -URI https://asc.fasb.org/606/tableOfContent + Details Name: us-gaap_RevenueFromContractWithCustomerTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.25.1

Segment Information	3 Months Ended
	Mar. 31, 2025
Segment Reporting [Abstract]
Segment Information	4. Segment Information We have two reportable segments – petroleum additives and specialty materials. The petroleum additives segment includes lubricant and fuel additives which are necessary for the efficient and reliable operation of vehicles and machinery. The specialty materials segment includes critical materials used in solid rocket motors for space launch and military defense applications. The petroleum additives and specialty materials segments are managed separately by the president of Afton and the president of AMPAC, respectively. The “All other” category shown in the tables below includes the operations of the antiknock compounds business, as well as certain contracted manufacturing and related services associated with Ethyl. We have determined that our chief executive officer is the chief operating decision maker (CODM) who makes key operating decisions and assesses the performance of the reportable segments. The CODM evaluates performance based on segment operating profit and considers budgeted and forecasted variances to actual results in allocating resources to the segments. The segment accounting policies are the same as those described in Note 1 of our 2024 Annual Report. NewMarket Services expenses are billed to Afton, AMPAC, and Ethyl based on the services provided. Depreciation on segment property, plant, and equipment, as well as amortization of segment definite-lived intangible assets and lease right-of-use assets are included in segment operating profit. No transfers occurred between any of the petroleum additives segment, specialty materials segment, and the “All other” category during the periods presented. The table below reports net sales and operating profit by segment, as well as a reconciliation to income before income tax expense, for the three months ended March 31, 2025 and March 31, 2024. No single customer accounted for 10% or more of our total net sales in any period presented. Three Months Ended March 31, (in thousands) 2025 2024 Net sales Petroleum additives Lubricant additives $ 559,178  $ 571,915  Fuel additives 86,376  105,349  Total 645,554  677,264  Specialty materials 53,721  17,047  All other 1,671  2,425  Total net sales $ 700,946  $ 696,736  Segment operating profit Petroleum additives Net sales $ 645,554  $ 677,264  Cost of goods sold (437,746) (462,920) Research, development, and testing expenses (33,176) (31,200) Other segment items (32,525) (32,235) Petroleum additives segment operating profit 142,107  150,909  Specialty materials Net sales 53,721  17,047  Other segment items (30,534) (22,014) Specialty materials segment operating profit 23,187  (4,967) Total segment operating profit 165,294  145,942  All other (481) (81) Corporate, general, and administrative expenses (4,886) (5,557) Interest and financing expenses, net (10,700) (15,654) Other income (expense), net 14,886  13,043  Income before income tax expense $ 164,113  $ 137,693  The significant expense categories of cost of goods sold and research, development, and testing expenses are shown in the above segment operating profit table for the petroleum additives segment and are regularly provided to the CODM. The other segment items for the petroleum additives segment represent selling, general, and administrative expenses, as well as corporate services allocated to the reporting segment. The other segment items for the specialty materials segment include costs of goods sold; selling, general, and administrative expenses; and corporate services allocated to the reporting segment. Significant expense categories of the specialty materials segment are not regularly provided to the CODM. Asset information by segment is not reported internally or otherwise regularly provided to the CODM. The following tables show additions to long-lived assets by segment and depreciation and amortization by segment and the reconciliation to both consolidated amounts. The additions to long-lived assets include property, plant, and equipment and lease right-of-use assets. Three Months Ended March 31, (in thousands) 2025 2024 Additions to long-lived assets Petroleum additives $ 20,274  $ 21,304  Specialty materials 888  1,437  All other 0  2  Corporate 1,092  540  Total additions to long-lived assets $ 22,254  $ 23,283  Depreciation and amortization Petroleum additives $ 18,979  $ 19,074  Specialty materials 8,858  5,639  All other 12  11  Corporate 929  1,083  Total depreciation and amortization $ 28,778  $ 25,807

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 48 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-48 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 5: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 54 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-54 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 47 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-47 Reference 8: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 54 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-54 Reference 9: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 47 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-47 Reference 10: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 54 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-54 Reference 11: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 47 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-47 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 31 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-31 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 34 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-34 Reference 15: 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-Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-40 Reference 20: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/280/tableOfContent Reference 21: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 26 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-26 Reference 22: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-41 Reference 23: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-21 Reference 24: 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v3.25.1

Pension Plans and Other Postretirement Benefits	3 Months Ended
	Mar. 31, 2025
Retirement Benefits [Abstract]
Pension Plans and Other Postretirement Benefits	Pension Plans and Other Postretirement Benefits The table below shows cash contributions made during the three months ended March 31, 2025, as well as the remaining cash contributions we expect to make during the year ending December 31, 2025, for our domestic and foreign pension plans and domestic postretirement benefit plan. (in thousands) Actual Cash Contributions for Three Months Ended March 31, 2025 Expected Remaining Cash Contributions for Year Ending  December 31, 2025 Domestic plans Pension benefits $ 832  $ 3,004  Postretirement benefits 413  696  Foreign plans Pension benefits 1,129  3,888  The tables below present information on net periodic benefit cost (income) for our domestic and foreign pension plans and domestic postretirement benefit plan. The service cost component of net periodic benefit cost (income) is reflected in cost of goods sold; selling, general, and administrative expenses; or research, development, and testing expenses, according to where other compensation costs arising from services rendered by the pertinent employee are recorded on the Consolidated Statements of Income. The remaining components of net periodic benefit cost (income) are recorded in other income (expense), net on the Consolidated Statements of Income.   Domestic   Pension Benefits Postretirement Benefits Three Months Ended March 31, (in thousands) 2025 2024 2025 2024 Service cost $ 2,857  $ 3,016  $ 139  $ 135  Interest cost 6,200  5,722  414  418  Expected return on plan assets (15,114) (13,541) (199) (192) Amortization of prior service cost (credit) 45  47  (757) (757) Amortization of actuarial net (gain) loss (1,012) (457) (70) (16) Net periodic benefit cost (income) $ (7,024) $ (5,213) $ (473) $ (412)   Foreign   Pension Benefits Three Months Ended March 31, (in thousands) 2025 2024 Service cost $ 807  $ 1,087  Interest cost 1,631  1,618  Expected return on plan assets (3,877) (3,333) Amortization of prior service cost (credit) 35  35  Amortization of actuarial net (gain) loss (247) (7) Net periodic benefit cost (income) $ (1,651) $ (600)

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- Definition The entire disclosure for retirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480794/715-70-50-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (l) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/715/tableOfContent Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (o) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (p) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (r)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (r)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480126/715-20-S99-2 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480266/715-60-50-3 + Details Name: us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.25.1

Earnings Per Share	3 Months Ended
	Mar. 31, 2025
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share We had 38,275 shares of nonvested restricted stock at March 31, 2025 and 34,678 shares of nonvested restricted stock at March 31, 2024 that were excluded from the calculation of diluted earnings per share, as their effect on earnings per share would be anti-dilutive. The nonvested restricted stock is considered a participating security since the restricted stock contains nonforfeitable rights to dividends. As such, we use the two-class method to compute basic and diluted earnings per share for all periods presented since this method yields the most dilutive result. The following table illustrates the earnings allocation method utilized in the calculation of basic and diluted earnings per share. Three Months Ended March 31, (in thousands, except per-share amounts) 2025 2024 Earnings per share numerator: Net income attributable to common shareholders before allocation of earnings to participating securities $ 125,949  $ 107,732  Earnings allocated to participating securities (480) (373) Net income attributable to common shareholders after allocation of earnings to participating securities $ 125,469  $ 107,359  Earnings per share denominator: Weighted-average number of shares of common stock outstanding - basic and diluted 9,460  9,557  Earnings per share - basic and diluted $ 13.26  $ 11.23

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/260/tableOfContent Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-3 + Details Name: us-gaap_EarningsPerShareTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.25.1

Inventories	3 Months Ended
	Mar. 31, 2025
Inventory Disclosure [Abstract]
Inventories	Inventories (in thousands) March 31, 2025 December 31, 2024 Finished goods and work-in-process $ 385,943  $ 403,459  Raw materials 78,012  77,258  Stores, supplies, and other 25,804  24,709  $ 489,759  $ 505,426

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 330 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/330/tableOfContent + Details Name: us-gaap_InventoryDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.25.1

Intangibles (Net of Amortization) and Goodwill	3 Months Ended
	Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract]
Intangibles (Net of Amortization) and Goodwill	Intangibles (Net of Amortization) and Goodwill The net carrying amount of intangibles and goodwill was $744 million at March 31, 2025 and $750 million at December 31, 2024. The gross carrying amount and accumulated amortization of each type of intangible asset and goodwill are presented in the table below.   March 31, 2025 December 31, 2024 (in thousands) Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Amortizing intangible assets Formulas and technology $ 60,000  $ 9,095  $ 60,000  $ 7,220  Customer bases 280,440  23,832  280,440  19,856  Trademarks and trade names 30,000  2,425  30,000  1,925  Water rights 29,392  29,392  Goodwill 379,646  379,593  $ 779,478  $ 35,352  $ 779,425  $ 29,001  Of the total intangibles (net of amortization) and goodwill, $124 million is attributable to the petroleum additives segment and $620 million is attributable to the specialty materials segment. The change in the gross carrying amount between December 31, 2024 and March 31, 2025 is due to the foreign currency fluctuation on goodwill in the petroleum additives segment. See Note 2 for further information on the intangibles and goodwill obtained with the AMPAC acquisition. There is no accumulated goodwill impairment. Amortization expense was (in thousands): Three months ended March 31, 2025 6,351  Three months ended March 31, 2024 5,372  Estimated amortization expense for the remainder of 2025, as well as estimated annual amortization expense related to our intangible assets for the next five years, is expected to be (in thousands): 2025 $ 19,053  2026 25,404  2027 25,404  2028 25,355  2029 25,214  2030 25,214  We amortize the formulas and technology over 8 years, the customer bases over 17.5 to 20 years, and the trademarks and trade names over 15 years.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details Name: us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.25.1

Long-term Debt	3 Months Ended
	Mar. 31, 2025
Debt Disclosure [Abstract]
Long-term Debt	Long-term Debt (in thousands) March 31, 2025 December 31, 2024 Senior notes - 2.70% due 2031 (net of related deferred financing costs) $ 394,727  $ 394,506  Senior notes - 3.78% due 2029 200,000  250,000  Term loan (net of related deferred financing costs) 249,828  249,775  Revolving credit facility 146,000  77,000  $ 990,555  $ 971,281  Senior Notes - The 2.70% senior notes, which were issued in 2021, are unsecured with an aggregate principal amount of $400 million. The offer and sale of the notes were registered under the Securities Act of 1933, as amended. The 3.78% senior notes are unsecured and were issued in a 2017 private placement with The Prudential Insurance Company of America and certain other purchasers. We made the first principal payment of $50 million on January 4, 2025 and have four remaining principal payments of $50 million due January 4 of each year through 2029. We were in compliance with all covenants under all issuances of senior notes as of March 31, 2025 and December 31, 2024. Term Loan Credit Agreement - The term loan credit agreement is unsecured, has a borrowing capacity of $250 million, a term of two years, and matures on January 22, 2026. We borrowed the entire $250 million available under the term loan credit agreement and are required to repay the principal amount borrowed under the term loan in full at maturity. We may, in our sole discretion and subject to the conditions set forth in the term loan credit agreement, prepay amounts borrowed under the term loan, together with any accrued and unpaid interest, prior to maturity. Any amounts prepaid prior to maturity are not available for additional borrowings by NewMarket. We were in compliance with all covenants under the term loan credit agreement as of March 31, 2025 and December 31, 2024. Revolving Credit Facility - The revolving credit facility has a borrowing capacity of $900 million, a term of five years, and matures on January 22, 2029. The obligations under the revolving credit facility are unsecured. The average interest rate for borrowings under the revolving credit agreement was 5.6% during the first three months of 2025 and 6.5% during the year ended December 31, 2024. Outstanding borrowings under the revolving credit facility amounted to $146 million at March 31, 2025 and $77 million at December 31, 2024. Outstanding letters of credit amounted to approximately $4 million at both March 31, 2025 and December 31, 2024. The unused portion of the revolving credit facility amounted to $750 million at March 31, 2025 and $819 million at December 31, 2024. We were in compliance with all covenants under the revolving credit facility as of March 31, 2025 and December 31, 2024.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-6 Reference 2: 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v3.25.1

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2025
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Matters We are involved in legal proceedings that are incidental to our business and may include administrative or judicial actions. Some of these legal proceedings involve governmental authorities and relate to environmental matters. For further information, see Environmental below. While it is not possible to predict or determine with certainty the outcome of any legal proceeding, we believe the outcome of any of these proceedings, or all of them combined, will not result in a material adverse effect on our consolidated results of operations, financial condition, or cash flows. Environmental We are involved in environmental proceedings and potential proceedings relating to soil and groundwater contamination, disposal of hazardous waste, and other environmental matters at several of our current or former facilities, or at third-party sites where we have been designated as a potentially responsible party. While we believe we are currently adequately accrued for known environmental issues, it is possible that unexpected future costs could have a significant impact on our consolidated financial position, results of operations, and cash flows. Our total accruals for environmental remediation, dismantling, and decontamination were approximately $11 million at both March 31, 2025 and December 31, 2024. Of the total accrual, the current portion is included in accrued expenses and the noncurrent portion is included in other noncurrent liabilities on the Condensed Consolidated Balance Sheets. Our more significant environmental sites include a former plant site in Baton Rouge, Louisiana and a Houston, Texas plant site. Together, the amounts accrued on a discounted basis related to these sites represented approximately $8 million of the total accrual above at March 31, 2025 and $9 million at December 31, 2024, using discount rates ranging from 3% to 9% for both periods. The aggregate undiscounted amount for these sites was $10 million at March 31, 2025 and $11 million at December 31, 2024. Leases At March 31, 2025, we had commitments of approximately $3 million for finance leases that have not yet commenced.

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- Definition The entire disclosure for commitments and contingencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 405 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/405-30/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 440 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482648/440-10-50-4 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/450/tableOfContent Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 954 -SubTopic 440 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478522/954-440-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 440 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482648/440-10-50-4 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 440 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/440/tableOfContent + Details Name: us-gaap_CommitmentsAndContingenciesDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.25.1

Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss	3 Months Ended
	Mar. 31, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss	Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Loss) The balances of, and changes in, the components of accumulated other comprehensive income (loss), net of tax, consist of the following: (in thousands) Pension Plans and Other Postretirement Benefits Foreign Currency Translation Adjustments Accumulated Other Comprehensive (Loss) Income Balance at December 31, 2023 $ 79,966  $ (101,037) $ (21,071) Other comprehensive income (loss) before reclassifications 0  (6,943) (6,943) Amounts reclassified from accumulated other comprehensive loss (a) (860) 0  (860) Other comprehensive income (loss) (860) (6,943) (7,803) Balance at March 31, 2024 $ 79,106  $ (107,980) $ (28,874) Balance at December 31, 2024 $ 151,958  $ (119,088) $ 32,870  Other comprehensive income (loss) before reclassifications 0  12,515  12,515  Amounts reclassified from accumulated other comprehensive loss (a) (1,489) 0  (1,489) Other comprehensive income (loss) (1,489) 12,515  11,026  Balance at March 31, 2025 $ 150,469  $ (106,573) $ 43,896  (a) The pension plan and other postretirement benefit components of accumulated other comprehensive loss are included in the computation of net periodic benefit cost (income). See Note 5 in this Quarterly Report on Form 10-Q and Note 18 in our 2024 Annual Report for further information.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/220/tableOfContent + Details Name: us-gaap_ComprehensiveIncomeNoteTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.25.1

Fair Value Measurements	3 Months Ended
	Mar. 31, 2025
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The carrying amount of cash and cash equivalents in the Condensed Consolidated Balance Sheets, as well as the fair value, was $118 million at March 31, 2025 and $77 million at December 31, 2024. The fair value is classified as Level 1 in the fair value hierarchy. No material events occurred during the three months ended March 31, 2025 requiring adjustment to the recognized balances of assets or liabilities which are recorded at fair value on a nonrecurring basis. Long-term debt – We record the carrying amount of our long-term debt at historical cost, less deferred financing costs related to our outstanding senior notes and term loan. The estimated fair value of our long-term debt is shown in the table below and is based primarily on estimated current rates available to us for debt of the same remaining duration and adjusted for nonperformance risk and credit risk. The estimated fair value of our publicly traded outstanding senior notes included in the table below is based on the last quoted price closest to March 31, 2025. The fair value of our debt instruments is classified as Level 2 in the fair value hierarchy. March 31, 2025 December 31, 2024 (in thousands) Carrying Amount Fair Value Carrying Amount Fair Value Long-term debt $ 990,555  $ 939,062  $ 971,281  $ 906,925

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 107 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-107 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 940 -SubTopic 820 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478119/940-820-50-1 + Details Name: us-gaap_FairValueDisclosuresTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.25.1

Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 2025
Accounting Standards Update and Change in Accounting Principle [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements In December 2023, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update No. 2023-09, "Income Taxes (Topic 740): Improvements to Income Tax Disclosures" (ASU 2023-09). The FASB issued ASU 2023-09 to enhance the transparency and decision-making usefulness of income tax disclosures by requiring additional information on an entity's tax rate reconciliation, as well as income taxes paid. ASU 2023-09 was effective for our annual reporting period beginning January 1, 2025. The required disclosures will be included in our 2025 Annual Report on Form 10-K. In November 2024, the FASB issued Accounting Standards Update No. 2024-03, "Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses" (ASU 2024-03). The FASB issued ASU 2024-03 to improve disclosures surrounding expenses in commonly presented captions including Cost of goods sold; Selling, general, and administrative expenses; and Research, development, and testing expenses. The additional expense information required to be disclosed includes purchases of inventory, employee compensation, depreciation, intangible assets amortization, and total selling expenses, as well as a qualitative description of amounts remaining that have not been separately presented. ASU 2024-03 is effective for our annual reporting period beginning January 1, 2027, and our quarterly reporting periods beginning January 1, 2028. Early adoption is permitted. We are currently assessing the impact that the adoption of ASU 2024-03 will have on the disclosures in our consolidated financial statements.

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- Definition The entire disclosure for change in accounting principle. 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v3.25.1

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Pay vs Performance Disclosure
Net income	$ 125,949	$ 107,732

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v3.25.1

Insider Trading Arrangements	3 Months Ended
	Mar. 31, 2025
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

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v3.25.1

Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2025
Accounting Policies [Abstract]
Long-Term Debt	We record the carrying amount of our long-term debt at historical cost, less deferred financing costs related to our outstanding senior notes and term loan.

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- Definition Disclosure of accounting policy related to debt. Includes, but is not limited to, debt issuance costs, the effects of refinancings, method of amortizing debt issuance costs and original issue discount, and classifications of debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 470 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-1 + Details Name: us-gaap_DebtPolicyTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.25.1

Acquisition of Business (Tables)	3 Months Ended
	Mar. 31, 2025
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Schedule of Business Acquisitions, by Acquisition	The fair values of the assets acquired and the liabilities assumed in the AMPAC acquisition are as follows (in millions): Cash and cash equivalents $ 16  Trade and other accounts receivable, net 6  Inventories 25  Prepaid expenses and other current assets 3  Property, plant, and equipment, net 111  Intangibles and goodwill 650  Deferred charges and other assets 5  Accounts payable (3) Accrued expenses (5) Other noncurrent liabilities (111) Fair value of net assets acquired $ 697
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]	Identified intangible assets acquired consisted of the following (in millions): Fair Value Estimated Useful Lives (in years) Customer base $ 275  17.5 Formulas and technology 60  8 Trademarks and trade names 30  15 Water rights 29  indefinite $ 394
Business Acquisition, Pro Forma Information [Table Text Block]	The following table presents the financial results in thousands for AMPAC from the date of acquisition through March 31, 2024 (in thousands). AMPAC January 16 to March 31, 2024 Net sales $ 17,047  Loss before income taxes (5,001) The following table presents our estimated unaudited pro forma consolidated results for the three months ended March 31, 2024, assuming the acquisition of AMPAC had occurred on January 1, 2023. The unaudited pro forma information is presented for informational purposes only and is not indicative of the results of operations that would have been realized if the acquisition had been completed at the beginning of 2023, nor is it indicative of expected results for any future period. In addition, no effect is given to any future synergistic benefits that could result from the integration of AMPAC into NewMarket. Unaudited pro forma information for the three months ended March 31, 2024 includes adjustments to depreciation and amortization based upon the fair value allocation of the purchase price to AMPAC's tangible and intangible assets acquired and liabilities assumed as though the acquisition had occurred on January 1, 2023, as well as adjustments for debt-related costs and management fees. The acquisition-related costs and the charge related to the fair value adjustment to acquisition-date inventory were recognized in actual results during the three months ended March 31, 2024, but for the presentation below, these costs are excluded from 2024 unaudited pro forma income before income taxes since on a pro forma basis, they would have been incurred during 2023. Pro Forma Supplemental Information (unaudited) (in thousands) Consolidated Three Months Ended March 31, 2024 Net sales $ 701,836  Income before income taxes 140,004

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- Definition Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 805 -SubTopic 20 -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-1 + Details Name: us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.25.1

Net Sales (Tables)	3 Months Ended
	Mar. 31, 2025
Revenue from Contract with Customer [Abstract]
Net Sales by Geographic Area	The following table provides information on our net sales by geographic area. Information on net sales by segment is presented in Note 4. Three Months Ended March 31, (in thousands) 2025 2024 Net sales United States $ 270,876  $ 248,236  Europe, Middle East, Africa, India 201,676  208,939  Asia Pacific 147,436  156,099  Other foreign 80,958  83,462  Net sales $ 700,946  $ 696,736

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v3.25.1

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2025
Segment Reporting [Abstract]
Net Sales by Segment	The table below reports net sales and operating profit by segment, as well as a reconciliation to income before income tax expense, for the three months ended March 31, 2025 and March 31, 2024. No single customer accounted for 10% or more of our total net sales in any period presented. Three Months Ended March 31, (in thousands) 2025 2024 Net sales Petroleum additives Lubricant additives $ 559,178  $ 571,915  Fuel additives 86,376  105,349  Total 645,554  677,264  Specialty materials 53,721  17,047  All other 1,671  2,425  Total net sales $ 700,946  $ 696,736  Segment operating profit Petroleum additives Net sales $ 645,554  $ 677,264  Cost of goods sold (437,746) (462,920) Research, development, and testing expenses (33,176) (31,200) Other segment items (32,525) (32,235) Petroleum additives segment operating profit 142,107  150,909  Specialty materials Net sales 53,721  17,047  Other segment items (30,534) (22,014) Specialty materials segment operating profit 23,187  (4,967) Total segment operating profit 165,294  145,942  All other (481) (81) Corporate, general, and administrative expenses (4,886) (5,557) Interest and financing expenses, net (10,700) (15,654) Other income (expense), net 14,886  13,043  Income before income tax expense $ 164,113  $ 137,693
Schedule Of Segment Operating Profit	The table below reports net sales and operating profit by segment, as well as a reconciliation to income before income tax expense, for the three months ended March 31, 2025 and March 31, 2024. No single customer accounted for 10% or more of our total net sales in any period presented. Three Months Ended March 31, (in thousands) 2025 2024 Net sales Petroleum additives Lubricant additives $ 559,178  $ 571,915  Fuel additives 86,376  105,349  Total 645,554  677,264  Specialty materials 53,721  17,047  All other 1,671  2,425  Total net sales $ 700,946  $ 696,736  Segment operating profit Petroleum additives Net sales $ 645,554  $ 677,264  Cost of goods sold (437,746) (462,920) Research, development, and testing expenses (33,176) (31,200) Other segment items (32,525) (32,235) Petroleum additives segment operating profit 142,107  150,909  Specialty materials Net sales 53,721  17,047  Other segment items (30,534) (22,014) Specialty materials segment operating profit 23,187  (4,967) Total segment operating profit 165,294  145,942  All other (481) (81) Corporate, general, and administrative expenses (4,886) (5,557) Interest and financing expenses, net (10,700) (15,654) Other income (expense), net 14,886  13,043  Income before income tax expense $ 164,113  $ 137,693
Additions To Long-lived Assets And Depreciation And Amortization By Segment	The following tables show additions to long-lived assets by segment and depreciation and amortization by segment and the reconciliation to both consolidated amounts. The additions to long-lived assets include property, plant, and equipment and lease right-of-use assets. Three Months Ended March 31, (in thousands) 2025 2024 Additions to long-lived assets Petroleum additives $ 20,274  $ 21,304  Specialty materials 888  1,437  All other 0  2  Corporate 1,092  540  Total additions to long-lived assets $ 22,254  $ 23,283  Depreciation and amortization Petroleum additives $ 18,979  $ 19,074  Specialty materials 8,858  5,639  All other 12  11  Corporate 929  1,083  Total depreciation and amortization $ 28,778  $ 25,807

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- Definition Tabular disclosure of all significant reconciling items in the reconciliation of total revenues from reportable segments to the entity's consolidated revenues. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-31 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 + Details Name: us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-25 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 + Details Name: us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

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- References No definition available. + Details Name: us-gaap_SegmentReportingAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.25.1

Pension Plans and Other Postretirement Benefits (Tables)	3 Months Ended
	Mar. 31, 2025
Retirement Benefits [Abstract]
Cash Contributions Made And Expected Remaining Contributions For Pension And Postretirement Benefit Plans	The table below shows cash contributions made during the three months ended March 31, 2025, as well as the remaining cash contributions we expect to make during the year ending December 31, 2025, for our domestic and foreign pension plans and domestic postretirement benefit plan. (in thousands) Actual Cash Contributions for Three Months Ended March 31, 2025 Expected Remaining Cash Contributions for Year Ending  December 31, 2025 Domestic plans Pension benefits $ 832  $ 3,004  Postretirement benefits 413  696  Foreign plans Pension benefits 1,129  3,888
Net Periodic Benefit Cost (Income) For Pension And Postretirement Benefit Plans	The tables below present information on net periodic benefit cost (income) for our domestic and foreign pension plans and domestic postretirement benefit plan. The service cost component of net periodic benefit cost (income) is reflected in cost of goods sold; selling, general, and administrative expenses; or research, development, and testing expenses, according to where other compensation costs arising from services rendered by the pertinent employee are recorded on the Consolidated Statements of Income. The remaining components of net periodic benefit cost (income) are recorded in other income (expense), net on the Consolidated Statements of Income.   Domestic   Pension Benefits Postretirement Benefits Three Months Ended March 31, (in thousands) 2025 2024 2025 2024 Service cost $ 2,857  $ 3,016  $ 139  $ 135  Interest cost 6,200  5,722  414  418  Expected return on plan assets (15,114) (13,541) (199) (192) Amortization of prior service cost (credit) 45  47  (757) (757) Amortization of actuarial net (gain) loss (1,012) (457) (70) (16) Net periodic benefit cost (income) $ (7,024) $ (5,213) $ (473) $ (412)   Foreign   Pension Benefits Three Months Ended March 31, (in thousands) 2025 2024 Service cost $ 807  $ 1,087  Interest cost 1,631  1,618  Expected return on plan assets (3,877) (3,333) Amortization of prior service cost (credit) 35  35  Amortization of actuarial net (gain) loss (247) (7) Net periodic benefit cost (income) $ (1,651) $ (600)

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 20 -Topic 715 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-3 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-4 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-2 + Details Name: us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details Name: us-gaap_ScheduleOfNetBenefitCostsTableTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.25.1

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2025
Earnings Per Share [Abstract]
Schedule of Basic and Diluted Earnings Per Share	The following table illustrates the earnings allocation method utilized in the calculation of basic and diluted earnings per share. Three Months Ended March 31, (in thousands, except per-share amounts) 2025 2024 Earnings per share numerator: Net income attributable to common shareholders before allocation of earnings to participating securities $ 125,949  $ 107,732  Earnings allocated to participating securities (480) (373) Net income attributable to common shareholders after allocation of earnings to participating securities $ 125,469  $ 107,359  Earnings per share denominator: Weighted-average number of shares of common stock outstanding - basic and diluted 9,460  9,557  Earnings per share - basic and diluted $ 13.26  $ 11.23

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- References No definition available. + Details Name: us-gaap_EarningsPerShareAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details Name: us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.25.1

Inventories (Tables)	3 Months Ended
	Mar. 31, 2025
Inventory Disclosure [Abstract]
Schedule of Inventories	(in thousands) March 31, 2025 December 31, 2024 Finished goods and work-in-process $ 385,943  $ 403,459  Raw materials 78,012  77,258  Stores, supplies, and other 25,804  24,709  $ 489,759  $ 505,426

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- References No definition available. + Details Name: us-gaap_InventoryDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483489/210-10-50-1 + Details Name: us-gaap_ScheduleOfInventoryCurrentTableTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.25.1

Intangibles (Net of Amortization) and Goodwill (Tables)	3 Months Ended
	Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Information Related to Intangible Assets and Goodwill	The gross carrying amount and accumulated amortization of each type of intangible asset and goodwill are presented in the table below.   March 31, 2025 December 31, 2024 (in thousands) Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Amortizing intangible assets Formulas and technology $ 60,000  $ 9,095  $ 60,000  $ 7,220  Customer bases 280,440  23,832  280,440  19,856  Trademarks and trade names 30,000  2,425  30,000  1,925  Water rights 29,392  29,392  Goodwill 379,646  379,593  $ 779,478  $ 35,352  $ 779,425  $ 29,001
Schedule Of Amortization Expense	Amortization expense was (in thousands): Three months ended March 31, 2025 6,351  Three months ended March 31, 2024 5,372
Schedule Of Estimated Annual Amortization Expense Related To Intangible Assets	Estimated amortization expense for the remainder of 2025, as well as estimated annual amortization expense related to our intangible assets for the next five years, is expected to be (in thousands): 2025 $ 19,053  2026 25,404  2027 25,404  2028 25,355  2029 25,214  2030 25,214

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- Definition Tabular disclosure of amortization expense of assets, excluding financial assets, that lack physical substance, having a limited useful life. + References No definition available. + Details Name: us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseTableTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

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- References No definition available. + Details Name: us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details Name: us-gaap_ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 + Details Name: us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.25.1

Long-term Debt (Tables)	3 Months Ended
	Mar. 31, 2025
Debt Disclosure [Abstract]
Schedule Of Long-Term Debt	(in thousands) March 31, 2025 December 31, 2024 Senior notes - 2.70% due 2031 (net of related deferred financing costs) $ 394,727  $ 394,506  Senior notes - 3.78% due 2029 200,000  250,000  Term loan (net of related deferred financing costs) 249,828  249,775  Revolving credit facility 146,000  77,000  $ 990,555  $ 971,281

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- References No definition available. + Details Name: us-gaap_DebtDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details Name: us-gaap_ScheduleOfDebtTableTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.25.1

Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss (Tables)	3 Months Ended
	Mar. 31, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Components of Accumulated Other Comprehensive Loss, Net of Tax	The balances of, and changes in, the components of accumulated other comprehensive income (loss), net of tax, consist of the following: (in thousands) Pension Plans and Other Postretirement Benefits Foreign Currency Translation Adjustments Accumulated Other Comprehensive (Loss) Income Balance at December 31, 2023 $ 79,966  $ (101,037) $ (21,071) Other comprehensive income (loss) before reclassifications 0  (6,943) (6,943) Amounts reclassified from accumulated other comprehensive loss (a) (860) 0  (860) Other comprehensive income (loss) (860) (6,943) (7,803) Balance at March 31, 2024 $ 79,106  $ (107,980) $ (28,874) Balance at December 31, 2024 $ 151,958  $ (119,088) $ 32,870  Other comprehensive income (loss) before reclassifications 0  12,515  12,515  Amounts reclassified from accumulated other comprehensive loss (a) (1,489) 0  (1,489) Other comprehensive income (loss) (1,489) 12,515  11,026  Balance at March 31, 2025 $ 150,469  $ (106,573) $ 43,896  (a) The pension plan and other postretirement benefit components of accumulated other comprehensive loss are included in the computation of net periodic benefit cost (income). See Note 5 in this Quarterly Report on Form 10-Q and Note 18 in our 2024 Annual Report for further information.

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- References No definition available. + Details Name: us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 + Details Name: us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

v3.25.1

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2025
Fair Value Disclosures [Abstract]
Estimated Fair Value Of Long-Term Debt	March 31, 2025 December 31, 2024 (in thousands) Carrying Amount Fair Value Carrying Amount Fair Value Long-term debt $ 990,555  $ 939,062  $ 971,281  $ 906,925

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + Details Name: us-gaap_FairValueByBalanceSheetGroupingTextBlock Namespace Prefix: us-gaap_ Data Type: dtr-types:textBlockItemType Balance Type: na Period Type: duration

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- References No definition available. + Details Name: us-gaap_FairValueDisclosuresAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.25.1

Acquisition of Business (Narrative) (Details)	Jan. 16, 2024 USD ($)
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Payments to Acquire Businesses, Gross	$ 697,000,000
Goodwill, Acquired During Period	256,000,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount	0
Business Combination, Acquisition Related Costs	$ 1,000,000

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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479581/805-30-50-1 + Details Name: us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479405/805-10-25-23 + Details Name: us-gaap_BusinessCombinationAcquisitionRelatedCosts Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- References No definition available. + Details Name: us-gaap_BusinessCombinationAndAssetAcquisitionAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482548/350-20-55-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 + Details Name: us-gaap_GoodwillAcquiredDuringPeriod Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479581/805-30-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + Details Name: us-gaap_PaymentsToAcquireBusinessesGross Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

v3.25.1

Acquisition of Business (Fair Values of Assets and Liabilities Assumed) (Details) $ in Millions	Jan. 16, 2024 USD ($)
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	$ 16
Business Combination, Acquired Receivable, Fair Value	6
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory	25
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	111
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Including Goodwill	650
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	5
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable	(3)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	(5)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	(111)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	$ 697

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- Definition Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-1 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479303/805-10-55-37 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-1 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-1 + Details Name: us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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v3.25.1

Acquisition of Business (Schedule of Intangibles) (Details) $ in Millions	Jan. 16, 2024 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	$ 394
AMPAC [Member] | Water rights
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets Acquired	29
AMPAC [Member] | Customer Bases [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 275
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life	17 years 6 months
AMPAC [Member] | Formulas And Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 60
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life	8 years
AMPAC [Member] | Trademarks and Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 30
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life	15 years

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v3.25.1

Acquisition of Business (Schedule of ProForma Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2024
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue	$ 701,836
Business Acquisition, Pro Forma Income Before Income Taxes	$ 140,004
AMPAC [Member]
Business Acquisition [Line Items]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual		$ 17,047
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual		$ (5,001)

X

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v3.25.1

Net Sales (Schedule of Net Sales by Geographical Area) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Net sales	$ 700,946	$ 696,736
United States
Disaggregation of Revenue [Line Items]
Net sales	270,876	248,236
Europe, Middle East, Africa, India [Member]
Disaggregation of Revenue [Line Items]
Net sales	201,676	208,939
Asia Pacific
Disaggregation of Revenue [Line Items]
Net sales	147,436	156,099
Other Foreign [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 80,958	$ 83,462

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v3.25.1

Segment Information (Narrative) (Details)	3 Months Ended
	Mar. 31, 2025
Segment Reporting [Abstract]
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]	Chief Executive Officer [Member]

X

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v3.25.1

Segment Information (Schedule Of Net Sales And Operating Profit By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Information [Line Items]
Net sales	$ 700,946	$ 696,736
Cost of goods sold	464,923	480,371
Research, development, and testing expenses	33,176	31,200
Segment operating profit	159,869	140,800
Corporate, general, and administrative expenses	(42,978)	(44,365)
Interest and financing expenses, net	(10,700)	(15,654)
Other income (expense), net	14,944	12,547
Income before income tax expense	164,113	137,693
Operating Segments [Member]
Segment Information [Line Items]
Segment operating profit	165,294	145,942
Operating Segments [Member] | Petroleum Additives [Member]
Segment Information [Line Items]
Net sales	645,554	677,264
Cost of goods sold	(437,746)	(462,920)
Research, development, and testing expenses	(33,176)	(31,200)
Other segment items	(32,525)	(32,235)
Segment operating profit	142,107	150,909
Operating Segments [Member] | All Other [Member]
Segment Information [Line Items]
Net sales	1,671	2,425
Segment operating profit	(481)	(81)
Operating Segments [Member] | Specialty Materials [Member]
Segment Information [Line Items]
Net sales	53,721	17,047
Other segment items	(30,534)	(22,014)
Segment operating profit	23,187	(4,967)
Operating Segments [Member] | Lubricant additives [Member] | Petroleum Additives [Member]
Segment Information [Line Items]
Net sales	559,178	571,915
Operating Segments [Member] | Fuel additives [Member] | Petroleum Additives [Member]
Segment Information [Line Items]
Net sales	86,376	105,349
Corporate, Non-Segment [Member]
Segment Information [Line Items]
Corporate, general, and administrative expenses	(4,886)	(5,557)
Interest and financing expenses, net	(10,700)	(15,654)
Other income (expense), net	$ 14,886	$ 13,043

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v3.25.1

Schedule of Additions to Long-lived Assets and Depreciation and Amortization (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Information [Line Items]
Additions to long-lived assets	$ 22,254	$ 23,283
Depreciation and amortization	28,778	25,807
Operating Segments [Member] | Petroleum Additives [Member]
Segment Information [Line Items]
Additions to long-lived assets	20,274	21,304
Depreciation and amortization	18,979	19,074
Operating Segments [Member] | All Other [Member]
Segment Information [Line Items]
Additions to long-lived assets	0	2
Depreciation and amortization	12	11
Operating Segments [Member] | Specialty Materials [Member]
Segment Information [Line Items]
Additions to long-lived assets	888	1,437
Depreciation and amortization	8,858	5,639
Corporate, Non-Segment [Member]
Segment Information [Line Items]
Additions to long-lived assets	1,092	540
Depreciation and amortization	$ 929	$ 1,083

X

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v3.25.1

Pension Plans and Other Postretirement Benefits (Cash Contributions Made And Expected Remaining Contributions For Pension And Postretirement Benefit Plans) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($)
Pension Plan [Member] | Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual Cash Contributions	$ 832
Expected Remaining Cash Contributions	3,004
Pension Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual Cash Contributions	1,129
Expected Remaining Cash Contributions	3,888
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual Cash Contributions	413
Expected Remaining Cash Contributions	$ 696

X

- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details Name: us-gaap_DefinedBenefitPlanContributionsByEmployer Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Amount of contribution expected to be received by defined benefit plan from employer in remainder of current fiscal year. Excludes contribution previously paid by employer in current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details Name: us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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v3.25.1

Pension Plans and Other Postretirement Benefits (Net Periodic Benefit Cost (Income) For Pension And Postretirement Benefit Plans) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Pension Plan [Member] | Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,857	$ 3,016
Interest cost	6,200	5,722
Expected return on plan assets	(15,114)	(13,541)
Amortization of prior service cost (credit)	45	47
Amortization of actuarial net (gain) loss	(1,012)	(457)
Net periodic benefit cost (income)	(7,024)	(5,213)
Pension Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	807	1,087
Interest cost	1,631	1,618
Expected return on plan assets	(3,877)	(3,333)
Amortization of prior service cost (credit)	35	35
Amortization of actuarial net (gain) loss	(247)	(7)
Net periodic benefit cost (income)	(1,651)	(600)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	139	135
Interest cost	414	418
Expected return on plan assets	(199)	(192)
Amortization of prior service cost (credit)	(757)	(757)
Amortization of actuarial net (gain) loss	(70)	(16)
Net periodic benefit cost (income)	$ (473)	$ (412)

X

- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details Name: us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details Name: us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details Name: us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details Name: us-gaap_DefinedBenefitPlanInterestCost Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details Name: us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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v3.25.1

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Earnings Per Share [Abstract]
Anti-dilutive shares of nonvested restricted stock that were excluded from the calculation of diluted earnings per share (in shares)	38,275	34,678
Earnings per share numerator:
Net income attributable to common shareholders before allocation of earnings to participating securities	$ 125,949	$ 107,732
Earnings allocated to participating securities	(480)	(373)
Net income attributable to common shareholders after allocation of earnings to participating securities	$ 125,469	$ 107,359
Earnings per share denominator:
Weighted-average number of shares of common stock outstanding - basic (in shares)	9,460,000	9,557,000
Weighted-average number of shares of common stock outstanding - diluted (in shares)	9,460,000	9,557,000
Earnings per share - basic (in dollars per share)	$ 13.26	$ 11.23
Earnings per share - diluted (in dollars per share)	$ 13.26	$ 11.23

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482689/260-10-45-10 + Details Name: us-gaap_WeightedAverageNumberOfSharesOutstandingBasic Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

v3.25.1

Inventories (Schedule of Inventories) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Inventory Disclosure [Abstract]
Finished goods and work-in-process	$ 385,943	$ 403,459
Raw materials	78,012	77,258
Stores, supplies, and other	25,804	24,709
Inventories	$ 489,759	$ 505,426

X

- References No definition available. + Details Name: us-gaap_InventoryDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The aggregated amount of merchandise or goods held by the entity and readily available for future sale plus items held by the entity which are partially complete or in the process of being readied for future sale. This amount is net of valuation reserves and adjustments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 330 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.BB) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480581/330-10-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details Name: us-gaap_InventoryFinishedGoodsAndWorkInProcessNetOfReserves Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 852 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481372/852-10-55-10 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483467/210-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details Name: us-gaap_InventoryNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 330 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.BB) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480581/330-10-S99-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details Name: us-gaap_InventoryRawMaterialsNetOfReserves Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 330 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.BB) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480581/330-10-S99-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)(5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details Name: us-gaap_InventorySuppliesNetOfReserves Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

v3.25.1

Intangibles (Net of Amortization) and Goodwill (Narrative) (Details) - USD ($)	Mar. 31, 2025	Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Net carrying amount of intangibles and goodwill	$ 744,126,000	$ 750,424,000
Accumulated goodwill impairment	0	$ 0
Petroleum Additives [Member]
Finite-Lived Intangible Assets [Line Items]
Net carrying amount of intangibles and goodwill	124,000,000
Specialty Materials [Member]
Finite-Lived Intangible Assets [Line Items]
Net carrying amount of intangibles and goodwill	$ 620,000,000
Formulas And Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic life, in years	8 years
Customer Bases [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic life, in years	17 years 6 months
Customer Bases [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic life, in years	20 years
Trademarks and Trade Names
Finite-Lived Intangible Assets [Line Items]
Estimated economic life, in years	15 years

X

- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details Name: us-gaap_FiniteLivedIntangibleAssetUsefulLife Namespace Prefix: us-gaap_ Data Type: xbrli:durationItemType Balance Type: na Period Type: instant

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482686/350-30-45-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-3 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481283/985-20-50-2 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 926 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483154/926-20-50-5 + Details Name: us-gaap_FiniteLivedIntangibleAssetsLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Amount of accumulated impairment loss for asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482548/350-20-55-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 + Details Name: us-gaap_GoodwillImpairedAccumulatedImpairmentLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Definition Amount, after impairment and amortization, of goodwill, indefinite-lived, and finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 10 -Name Accounting Standards Codification -Section S45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480265/350-10-S45-1 + Details Name: us-gaap_IntangibleAssetsNetIncludingGoodwill Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Details Name: us-gaap_StatementBusinessSegmentsAxis=neu_PetroleumAdditivesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: srt_RangeAxis=srt_MinimumMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TrademarksAndTradeNamesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.25.1

Intangibles (Net of Amortization) and Goodwill (Schedule Of Information Related To Intangible Assets and Goodwill) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Amortizing intangible assets, Accumulated Amortization	$ 35,352	$ 29,001
Goodwill, Gross Carrying Amount	379,646	379,593
Amortizing intangible assets and Goodwill, Gross Carrying Amount	779,478	779,425
Water rights
Finite-Lived Intangible Assets [Line Items]
Other Indefinite-Lived Intangible Assets	29,392	29,392
Formulas And Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizing intangible assets, Gross Carrying Amount	60,000	60,000
Amortizing intangible assets, Accumulated Amortization	9,095	7,220
Customer Bases [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizing intangible assets, Gross Carrying Amount	280,440	280,440
Amortizing intangible assets, Accumulated Amortization	23,832	19,856
Trademarks and Trade Names
Finite-Lived Intangible Assets [Line Items]
Amortizing intangible assets, Gross Carrying Amount	30,000	30,000
Amortizing intangible assets, Accumulated Amortization	$ 2,425	$ 1,925

X

- Definition Gross amount, as of the balance sheet date, of finite lived intangible assets and of goodwill. + References No definition available. + Details Name: neu_IntangibleAssetsAndGoodwillGrossCarryingAmount Namespace Prefix: neu_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 10 -Name Accounting Standards Codification -Section S45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480265/350-10-S45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details Name: us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 10 -Name Accounting Standards Codification -Section S45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480265/350-10-S45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 928 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478859/928-340-50-1 + Details Name: us-gaap_FiniteLivedIntangibleAssetsGross Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Amount, before accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482548/350-20-55-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 + Details Name: us-gaap_GoodwillGross Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount after impairment of indefinite-lived intangible assets classified as other. Excludes financial assets and goodwill. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(15)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details Name: us-gaap_OtherIndefiniteLivedIntangibleAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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v3.25.1

Intangibles (Net of Amortization) and Goodwill (Schedule Of Amortization Expense And Estimated Annual Amortization Expense Related To Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 6,351	$ 5,372
2024	19,053
2025	25,404
2026	25,404
2027	25,355
2028	25,214
2029	$ 25,214

X

- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482686/350-30-45-2 + Details Name: us-gaap_AmortizationOfIntangibleAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in remainder of current fiscal year. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481283/985-20-50-2 + Details Name: us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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v3.25.1

Long-term Debt (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Long-term Debt, Noncurrent	$ 990,555	$ 971,281
2.70% Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes, interest rate	2.70%	2.70%
Long-term Debt, Noncurrent	$ 394,727	$ 394,506
3.78% Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes, interest rate	3.78%	3.78%
Long-term Debt, Noncurrent	$ 200,000	$ 250,000
Unsecured Debt
Debt Instrument [Line Items]
Long-term Debt, Noncurrent	249,828	249,775
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Noncurrent	$ 146,000	$ 77,000

X

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v3.25.1

Long-term Debt (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024	Jan. 22, 2024	Mar. 18, 2021
Debt Instrument [Line Items]
Long-term Debt, Noncurrent	$ 990,555,000	$ 971,281,000
2.70% Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes, interest rate	2.70%	2.70%
Principal amount of debt issued				$ 400,000,000
Long-term Debt, Noncurrent	$ 394,727,000	$ 394,506,000
3.78% Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes, interest rate	3.78%	3.78%
Long-term Debt, Noncurrent	$ 200,000,000	$ 250,000,000
Unsecured Debt
Debt Instrument [Line Items]
Principal amount of debt issued			$ 250,000,000
Long-term Debt, Noncurrent	$ 249,828,000	$ 249,775,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 900,000,000
Average interest rate during the period	5.60%	6.50%
Long-term Debt, Noncurrent	$ 146,000,000	$ 77,000,000
Outstanding letters of credit	4,000,000	4,000,000
Unused portion of revolving credit facility	$ 750,000,000	$ 819,000,000

X

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v3.25.1

Commitments and Contingencies (Environmental) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Site Contingency [Line Items]
Accruals for environmental remediation, dismantling, and decontamination, undiscounted	$ 11	$ 11
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]	Accrued expenses, Other noncurrent liabilities	Accrued expenses, Other noncurrent liabilities
Former TEL Plant Site Louisiana And Houston Texas Plant Site [Member]
Site Contingency [Line Items]
Accruals for environmental remediation, dismantling, and decontamination	$ 8	$ 9
Accruals for environmental remediation, dismantling, and decontamination, undiscounted	$ 10	$ 11
Minimum [Member] | Former TEL Plant Site Louisiana And Houston Texas Plant Site [Member]
Site Contingency [Line Items]
Discount rate	3.00%	3.00%
Maximum [Member] | Former TEL Plant Site Louisiana And Houston Texas Plant Site [Member]
Site Contingency [Line Items]
Discount rate	9.00%	9.00%

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v3.25.1

Commitment and Contingencies (Other Commitments) (Details) $ in Millions	Mar. 31, 2025 USD ($)
Financing Lease, Lease Not yet Commenced
Site Contingency [Line Items]
Unrecorded Unconditional Purchase Obligation, Including Lease Not yet Commenced, Total	$ 3.0

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v3.25.1

Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss (Schedule of Components of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Pension Plans and Other Postretirement Benefits, Beginning Balance		$ 151,958	$ 79,966
Foreign Currency Translation Adjustments, Beginning Balance		(119,088)	(101,037)
Accumulated Other Comprehensive (Loss) Income, Beginning Balance		32,870	(21,071)
Other comprehensive income (loss) before reclassifications, Pension Plans and Other Postretirement Benefits		0	0
Other comprehensive income (loss) before reclassifications, Foreign Currency Translation Adjustments		12,515	(6,943)
Other comprehensive income (loss) before reclassifications, Accumulated Other Comprehensive (Loss) Income		12,515	(6,943)
Amounts reclassified from accumulated other comprehensive loss, Pension Plans and Other Postretirement Benefits	[1]	(1,489)	(860)
Amounts reclassified from accumulated other comprehensive loss, Foreign Currency Translation Adjustments		0	0
Amounts reclassified from accumulated other comprehensive loss, Accumulated Other Comprehensive (Loss) Income		(1,489)	(860)
Total pension plans and other postretirement benefits		(1,489)	(860)
Other comprehensive income (loss), Foreign Currency Translation Adjustments		12,515	(6,943)
Other comprehensive income (loss)		11,026	(7,803)
Pension Plans and Other Postretirement Benefits, Ending Balance		150,469	79,106
Foreign Currency Translation Adjustments, Ending Balance		(106,573)	(107,980)
Accumulated Other Comprehensive (Loss) Income, Ending Balance		$ 43,896	$ (28,874)
[1] The pension plan and other postretirement benefit components of accumulated other comprehensive loss are included in the computation of net periodic benefit cost (income). See Note 5 in this Quarterly Report on Form 10-Q and Note 18 in our 2024 Annual Report for further information.

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v3.25.1

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of cash and cash equivalents in the Consolidated Balance Sheets	$ 118,253	$ 77,476
Carrying amount of cash and cash equivalents in the Consolidated Balance Sheets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of cash and cash equivalents in the Consolidated Balance Sheets	118,000	77,000
Fair Value, Inputs, Level 1 [Member] | Fair value of cash and cash equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of cash and cash equivalents	$ 118,000	$ 77,000

X

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v3.25.1

Fair Value Measurements (Estimated Fair Value Of Long-Term Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Long-term debt, including current maturities, Carrying amount	$ 990,555	$ 971,281
Fair Value, Inputs, Level 2 [Member]
Debt Instrument [Line Items]
Long-term debt, including current maturities, Fair value	$ 939,062	$ 906,925

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