NewMarket (NEU) 10-K 15 Feb 18 2017 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Jan. 31, 2018	Jun. 30, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Entity Registrant Name	NEWMARKET CORP
Entity Central Index Key	1,282,637
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		11,779,143
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 3,969,585,799

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net sales	[1]	$ 2,198,404	$ 2,049,451	$ 2,140,830
Cost of goods sold		1,556,386	1,368,690	1,461,774
Gross profit		642,018	680,761	679,056
Selling, general, and administrative expenses		165,056	161,112	164,082
Research, development, and testing expenses		140,193	156,959	158,254
Operating profit		336,769	362,690	356,720
Interest and financing expenses, net		21,856	16,785	14,652
Other income (expense), net		529	(2,697)	(3,097)
Income before income tax expense		315,442	343,208	338,971
Income tax expense		124,933	99,767	100,368
Net income		$ 190,509	$ 243,441	$ 238,603
Earnings per share - basic and diluted (in dollars per share)		$ 16.08	$ 20.54	$ 19.45
[1]	No single customer accounted for 10% or more of our total net sales in 2017, 2016, or 2015.

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 190,509	$ 243,441	$ 238,603
Pension plans and other postretirement benefits:
Prior service credit (cost) arising during the period, net of income tax expense (benefit) of $(286) in 2016 and $13,913 in 2015	0	(463)	21,855
Amortization of prior service cost (credit) included in net periodic benefit cost (income), net of income tax expense (benefit) of $(1,127) in 2017, $(1,123) in 2016 and $(375) in 2015	(1,955)	(1,801)	(629)
Actuarial net gain (loss) arising during the period, net of income tax expense (benefit) of $2,814 in 2017, $(4,409) in 2016 and $(2,477) in 2015	10,966	(8,102)	(1,331)
Amortization of actuarial net loss (gain) included in net periodic benefit cost (income), net of income tax expense (benefit) of $2,028 in 2017, $2,287 in 2016 and $3,052 in 2015	3,656	3,977	5,426
Total pension plans and other postretirement benefits	12,667	(6,389)	25,321
Foreign currency translation adjustments, net of income tax expense (benefit) of $703 in 2017, $(895) in 2016 and $(71) in 2015	23,849	(31,595)	(30,687)
Other comprehensive income (loss)	36,516	(37,984)	(5,366)
Comprehensive income	$ 227,025	$ 205,457	$ 233,237

Consolidated Statements Of Com4

Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Prior service credit (cost) arising during the period, income tax expense (benefit)	$ 0	$ (286)	$ 13,913
Amortization of prior service cost (credit) included in net periodic benefit cost, income tax expense (benefit)	(1,127)	(1,123)	(375)
Actuarial net gain (loss) arising during the period, income tax expense (benefit)	2,814	(4,409)	(2,477)
Amortization of actuarial net loss (gain) included in net periodic benefit cost, income tax expense (benefit)	2,028	2,287	3,052
Foreign currency translation adjustments, income tax expense (benefit)	$ 703	$ (895)	$ (71)

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 84,166	$ 192,154
Trade and other accounts receivable, net	335,317	306,916
Inventories	383,097	311,512
Prepaid expenses and other current assets	31,074	26,301
Total current assets	833,654	836,883
Property, plant, and equipment, at cost	1,474,962	1,264,957
Less accumulated depreciation and amortization	822,681	761,212
Net property, plant, and equipment	652,281	503,745
Intangibles (net of amortization) and goodwill	144,337	10,436
Prepaid pension cost	66,495	25,800
Deferred income taxes	4,349	29,063
Deferred charges and other assets	11,038	10,509
Total assets	1,712,154	1,416,436
Current liabilities:
Accounts payable	159,408	141,869
Accrued expenses	107,999	104,082
Dividends payable	19,055	17,478
Income taxes payable	16,340	17,573
Other current liabilities	13,991	13,588
Total current liabilities	316,793	294,590
Long-term debt	602,900	507,275
Other noncurrent liabilities	190,812	131,320
Total liabilities	1,110,505	933,185
Commitments and contingencies
Shareholders’ equity:
Common stock and paid-in capital (without par value; authorized shares - 80,000,000; issued and outstanding - 11,779,978 at December 31, 2017 and 11,845,972 at December 31, 2016)	0	1,603
Accumulated other comprehensive loss	(145,994)	(182,510)
Retained earnings	747,643	664,158
Total shareholders' equity	601,649	483,251
Total liabilities and shareholders' equity	$ 1,712,154	$ 1,416,436

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Common stock, no par value
Common stock, authorized shares	80,000,000	80,000,000
Common stock, issued shares	11,779,978	11,845,972
Common stock, outstanding shares	11,779,978	11,845,972

Consolidated Statements Of Shar

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, 2014		12,446,365
Balance at Dec. 31, 2014	$ 421,041	$ 0	$ (139,160)	$ 560,201
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	238,603			238,603
Other comprehensive income (loss)	(5,366)		(5,366)
Cash dividends	(70,763)			(70,763)
Repurchases of common stock (in shares)		(501,261)
Repurchases of common stock	(197,851)	$ (3,070)		(194,781)
Tax benefit from stock-based compensation	374	$ 374
Tax withholdings related to stock-based compensation (in shares)		(3,135)
Tax withholdings related to stock-based compensation	(1,199)	$ (3)		(1,196)
Stock-based compensation (in shares)		6,477
Stock-based compensation	2,725	$ 2,699		26
Balance (in shares) at Dec. 31, 2015		11,948,446
Balance at Dec. 31, 2015	387,564	$ 0	(144,526)	532,090
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	243,441			243,441
Other comprehensive income (loss)	(37,984)		(37,984)
Cash dividends	(75,829)			(75,829)
Repurchases of common stock (in shares)		(98,867)
Repurchases of common stock	(35,815)	$ (252)		(35,563)
Tax withholdings related to stock-based compensation (in shares)		(2,582)
Tax withholdings related to stock-based compensation	(1,076)	$ (1,076)		0
Stock-based compensation (in shares)		(1,025)
Stock-based compensation	$ 2,950	$ 2,931		19
Balance (in shares) at Dec. 31, 2016	11,845,972	11,845,972
Balance at Dec. 31, 2016	$ 483,251	$ 1,603	(182,510)	664,158
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	190,509			190,509
Other comprehensive income (loss)	36,516		36,516
Cash dividends	(82,885)			(82,885)
Repurchases of common stock (in shares)		(70,689)
Repurchases of common stock	(27,757)	$ (3,607)		(24,150)
Tax withholdings related to stock-based compensation (in shares)		(2,328)
Tax withholdings related to stock-based compensation	(915)	$ (915)		0
Stock-based compensation (in shares)		7,023
Stock-based compensation	$ 2,930	$ 2,919		11
Balance (in shares) at Dec. 31, 2017	11,779,978	11,779,978
Balance at Dec. 31, 2017	$ 601,649	$ 0	$ (145,994)	$ 747,643

Consolidated Statements Of Sha8

Consolidated Statements Of Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Cash dividends (in dollars per share)	$ 7	$ 6.40	$ 5.80

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Cash Flows [Abstract]
Cash and cash equivalents at beginning of year	$ 192,154	$ 93,424	$ 103,003
Cash flows from operating activities:
Net income	190,509	243,441	238,603
Adjustments to reconcile net income to cash flows from operating activities:
Depreciation and amortization	55,340	44,893	42,265
Noncash pension and postretirement expense	7,959	12,829	22,037
Deferred income tax expense	27,375	19,185	150
Tax Reform Act expense	31,375	0	0
Unrealized gain on derivative instruments, net	0	0	(1,656)
Change in assets and liabilities:
Trade and other accounts receivable, net	250	(38,231)	7,215
Inventories	(44,936)	14,480	(21,747)
Prepaid expenses	(2,715)	8,790	1,464
Accounts payable and accrued expenses	17,955	18,455	(8,809)
Book overdrafts	1,595	10,149	(8,241)
Income taxes payable	(8,475)	7,172	6,856
Cash pension and postretirement contributions	(26,264)	(25,898)	(26,813)
Realized loss on derivative instruments, net	0	4,825	4,877
Other, net	(7,173)	33,344	11,826
Cash provided from (used in) operating activities	242,795	353,434	268,027
Cash flows from investing activities:
Capital expenditures	(148,713)	(142,874)	(126,499)
Acquisition of business (net of $1,131 cash acquired)	(183,930)	0	0
Deposits for interest rate swap	0	(7,570)	(16,487)
Return of deposits for interest rate swap	0	11,832	18,140
Other, net	(2,000)	(4,749)	(4,877)
Cash provided from (used in) investing activities	(334,643)	(143,361)	(129,723)
Cash flows from financing activities:
Net (repayments) borrowings under revolving credit facility	(156,000)	11,000	131,000
Issuance of 3.78% senior notes	250,000	0	0
Dividends paid	(82,885)	(75,829)	(70,763)
Repurchases of common stock	(25,998)	(35,815)	(194,924)
Other, net	(4,093)	(2,733)	(791)
Cash provided from (used in) financing activities	(18,976)	(103,377)	(135,478)
Effect of foreign exchange on cash and cash equivalents	2,836	(7,966)	(12,405)
(Decrease) increase in cash and cash equivalents	(107,988)	98,730	(9,579)
Cash and cash equivalents at end of year	$ 84,166	$ 192,154	$ 93,424

Consolidated Statements Of Ca10

Consolidated Statements Of Cash Flows Consolidated Statements of Cash Flows (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Cash Acquired from Acquisition	$ 1,131
3.78% Senior Notes [Member]
Senior notes, interest rate	3.78%

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Consolidation —Our consolidated financial statements include the accounts of NewMarket Corporation and its subsidiaries. All intercompany transactions are eliminated upon consolidation. References to "we," "us," "our," the "company," and "NewMarket" are to NewMarket Corporation and its consolidated subsidiaries, unless the context indicates otherwise. NewMarket is the parent company of three operating companies, each managing its own assets and liabilities. Those companies are Afton, which focuses on petroleum additive products; Ethyl, representing certain contracted manufacturing and services, as well as the TEL business; and NewMarket Development, which manages the property and improvements that we own in Virginia. NewMarket is also the parent company of NewMarket Services, which provides various administrative services to NewMarket, Afton, Ethyl, and NewMarket Development. Certain reclassifications have been made to the accompanying consolidated financial statements and the related notes to conform to the current presentation. Foreign Currency Translation —We translate the balance sheets of our foreign subsidiaries into U.S. Dollars based on the current exchange rate at the end of each period. We translate the statements of income using the weighted-average exchange rates for the period. NewMarket includes translation adjustments in the Consolidated Balance Sheets as part of accumulated other comprehensive loss and transaction adjustments in the Consolidated Statements of Income as part of cost of goods sold. Foreign currency transaction adjustments resulted in a net gain of $5 million in both 2017 and 2016 , and a net loss of $11 million in 2015 . Revenue Recognition —Our policy is to recognize revenue from the sale of products when title and risk of loss have transferred to the buyer, the price is fixed and determinable, and collectability is reasonably assured. Net sales (revenues) are reported at the gross amount billed, including amounts related to shipping that are charged to the customer. Provisions for rebates to customers are recorded in the same period that the related sales are recorded. Freight costs incurred on the delivery of products are included in the Consolidated Statements of Income in cost of goods sold. Our standard terms of delivery are included in our contracts, sales order confirmation documents, and invoices. Taxes assessed by a governmental authority concurrent with sales to our customers, including sales, use, value-added, and revenue-related excise taxes, are not included as net sales, but are reflected in accrued expenses until remitted to the appropriate governmental authority. Cash and Cash Equivalents —Our cash equivalents consist of government obligations and commercial paper with original maturities of 90 days or less. Throughout the year, we have cash balances in excess of federally insured amounts on deposit with various financial institutions. We state cash and cash equivalents at cost, which approximates fair value. Accounts Receivable —We record our accounts receivable at net realizable value. We maintain an allowance for doubtful accounts for estimated losses resulting from our customers not making required payments. We determine the adequacy of the allowance by periodically evaluating each customer’s receivable balance, considering their financial condition and credit history, and considering current economic conditions. The allowance for doubtful accounts was not material at December 31, 2017 or December 31, 2016 . Inventories —NewMarket values its petroleum additives and TEL inventories at the lower of cost or net realizable value. In the United States, cost is determined on the last-in, first-out (LIFO) basis. In all other countries, we determine cost using the weighted-average method. Inventory cost includes raw materials, direct labor, and manufacturing overhead. Property, Plant, and Equipment —We state property, plant, and equipment at cost and compute depreciation by the straight-line method based on the estimated useful lives of the assets. We capitalize expenditures for significant improvements that extend the useful life of the related property. We expense repairs and maintenance, including plant turnaround costs, as incurred. When property is sold or retired, we remove the cost and accumulated depreciation from the accounts and any related gain or loss is included in earnings. Intangibles (Net of Amortization) and Goodwill —Identifiable intangibles include the cost of acquired contracts, formulas and technology, trademarks and trade names, and customer bases. We assign a value to identifiable intangibles based on independent third-party appraisals and management's assessment at the time of acquisition. NewMarket amortizes the cost of the customer bases by an accelerated method and the cost of the remaining identifiable intangibles by the straight-line method over the estimated economic life of the intangible. Goodwill arises from the excess of cost over net assets of businesses acquired. Goodwill represents the residual purchase price after allocation to all identifiable net assets. We test goodwill for impairment each year, as well as whenever a significant event or circumstance occurs which could reduce the fair value of the reporting unit to which the goodwill applies below the carrying amount of the reporting unit. We have historically tested goodwill for impairment as of December 31. This year, we voluntarily changed the annual impairment assessment date from December 31 to December 1. We determined this measurement date, which represents a change in the method of applying an accounting principle, to be preferable as it better aligns with our business planning and forecasting process, which is a key component of the annual impairment testing. The change in the measurement date did not delay, accelerate, or prevent an impairment charge. Impairment of Long-Lived Assets —When significant events or circumstances occur that might impair the value of long-lived assets, we evaluate recoverability of the recorded cost of these assets. Assets are considered to be impaired if their carrying amount is not recoverable from the estimated undiscounted future cash flows associated with the assets. If we determine an asset is impaired and its recorded cost is higher than estimated fair market value based on the estimated present value of future cash flows, we adjust the asset to estimated fair market value. Environmental Costs —NewMarket capitalizes environmental compliance costs if they extend the useful life of the related property or prevent future contamination. Environmental compliance costs also include maintenance and operation of pollution prevention and control facilities. We expense these compliance costs in cost of goods sold as incurred. Accrued environmental remediation and monitoring costs relate to an existing condition caused by past operations. NewMarket accrues these costs in current operations within cost of goods sold in the Consolidated Statements of Income when it is probable that we have incurred a liability and the amount can be reasonably estimated. These estimates are based on an assessment of the site, available clean-up methods, and prior experience in handling remediation. When we can reliably determine the amount and timing of future cash flows, we discount these liabilities, incorporating an inflation factor. Legal Costs —We expense legal costs in the period incurred. Employee Savings Plan —Most of our full-time salaried and hourly employees may participate in defined contribution savings plans. Employees who are covered by collective bargaining agreements may also participate in a savings plan according to the terms of their bargaining agreements. Employees, as well as NewMarket, contribute to the plans. We made contributions of $6 million in 2017 , $7 million in 2016 , and $6 million in 2015 related to these plans. Research, Development, and Testing Expenses —NewMarket expenses all research, development, and testing costs as incurred. R&D costs include personnel-related costs, as well as internal and external testing of our products. Income Taxes —We recognize deferred income taxes for temporary differences between the financial reporting basis and the income tax basis of assets and liabilities. We also adjust for changes in tax rates and laws at the time the changes are enacted. A valuation allowance is recorded when it is more likely than not that a deferred tax asset will not be realized. We recognize accrued interest and penalties associated with uncertain tax positions as part of income tax expense on our Consolidated Statements of Income. We generally provide for additional U.S. taxes that would be incurred if a foreign subsidiary returns its earnings in cash to the United States. Undistributed earnings of certain foreign subsidiaries for which U.S. taxes have not been provided were zero at December 31, 2017 , and totaled approximately at $537 million at December 31, 2016 , and $436 million at December 31, 2015 . The decrease from 2016 to 2017 is due to the deemed repatriation of foreign earnings resulting from the enactment of the Tax Reform Act. Deferred income taxes were not provided on the undistributed earnings in 2016 and 2015 since we expected them to be indefinitely reinvested abroad. Deferred income taxes were not recorded for undistributed earnings in 2017 because such earnings would either not be subject to U.S. tax when remitted as a result of the enactment the Tax Reform Act or they are considered permanently reinvested. As a result of this new legislation, we are continuing to evaluate the unrecognized deferred tax liability associated with our investment in foreign subsidiaries, but we do not anticipate the amount to be significant. Capital Lease Obligation —We record our capital lease obligations at the lower of fair market value of the related asset at the inception of the lease or the present value of the total minimum lease payments. Derivative Financial Instruments and Hedging Activities —We are exposed to certain risks arising from both our business operations and economic conditions. We manage our exposures to a wide variety of business and operational risks through management of our core business activities. We manage certain economic risks, including interest rate, liquidity, and credit risk primarily by managing the amount, sources, and duration of our debt funding, as well as through the use of derivative financial instruments. Specifically, we have entered, and in the future may enter, into interest rate swaps to manage our exposure to interest rate movements. In addition, our foreign operations expose us to fluctuations of foreign exchange rates. These fluctuations may impact our results of operations, financial position, and cash flows. To manage this exposure, we sometimes enter into foreign currency forward contracts to minimize currency exposure due to cash flows from foreign operations. We record all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether we have elected to designate a derivative in a hedging relationship and apply hedge accounting, and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. We may enter into derivative contracts that are intended to economically hedge certain of our risks, even though hedge accounting does not apply or we elect not to apply hedge accounting. We do not enter into derivative instruments for speculative purposes. We had no derivative financial instruments outstanding at December 31, 2017 or December 31, 2016. In 2009, we entered into an interest rate swap with Goldman Sachs in the notional amount of $97 million and with a maturity date of January 19, 2022 (Goldman Sachs interest rate swap). While outstanding, this exposure was fully collateralized through cash deposits posted with Goldman Sachs. We terminated this swap on September 7, 2016 and settled the liability using approximately $22 million of the cash deposit with Goldman Sachs. Under the terms of this interest rate swap, NewMarket made fixed rate payments at 5.3075% and Goldman Sachs made variable rate payments based on three-month LIBOR. Stock-based Compensation —We calculate the fair value of restricted stock and restricted stock units based on the closing price of our common stock on the date of grant. If award recipients are entitled to receive dividends during the vesting period, we make no adjustment to the fair value of the award for dividends. If the award does not entitle recipients to dividends during the vesting period, we reduce the grant-date price of our common stock by the present value of the dividends expected to be paid on the underlying shares during the vesting period, discounted at the risk-free interest rate. We recognize stock-based compensation expense for the number of awards expected to vest on a straight-line basis over the requisite service period. Estimates and Risks Due to Concentration of Business —The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. In addition, our financial results can be influenced by certain risk factors. Some of our significant concentrations of risk include the following: • reliance on a small number of significant customers; • customers concentrated in the fuel and lubricant industries; and • production of several of our products solely at one facility.

Acquisition of Business

Acquisition of Business	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	2. Acquisition of Business On July 3, 2017, Afton Chemical de Mexico, S.A. de C.V., an indirect, wholly-owned subsidiary of NewMarket Corporation, acquired approximately 99.5% of the outstanding capital stock of Aditivos Mexicanos, S.A. de C.V. (AMSA) for $185 million in cash. AMSA is a petroleum additives manufacturing, sales and distribution company based in Mexico City, Mexico. The results of AMSA's operations have been included in our consolidated financial statements since the date of acquisition and are not material. The noncontrolling interest is also not material. The acquisition agreement included all physical assets of AMSA. We have initiated a purchase price valuation to determine the fair values of the tangible and intangible assets acquired and liabilities assumed and the amount of goodwill to be recognized as of the acquisition date. The amounts recorded for certain assets and liabilities are preliminary and are subject to adjustment if additional information is obtained about facts that existed as of the acquisition date. The final determination of the fair values of certain assets and liabilities will be completed within the measurement period of up to one year from the acquisition date. A preliminary allocation of the purchase price is as follows (in millions): Cash $ 1 Trade accounts receivable 16 Inventory 7 Property, plant, and equipment 53 Goodwill 118 Intangible assets 18 Other long-term assets 2 Other current liabilities (8 ) Other long-term liabilities (3 ) Deferred taxes (19 ) Fair value of net assets acquired $ 185 Identified intangible assets acquired consisted of the following: Fair Value (in millions) Estimated Useful Lives (in years) Formulas and technology $ 9 3-6 Customer base 9 4 Total identified intangible assets $ 18 As part of the acquisition, we recorded $118 million of goodwill. The goodwill recognized is attributable to expected synergies, including a secure supply source for certain raw materials, as well as the skilled assembled workforce of AMSA. All of the goodwill recognized is part of the petroleum additives segment, and none is deductible for Mexican tax purposes. Pro forma results of operations are not presented as the acquisition was not considered material to our consolidated results.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share We had 16,708 shares in 2017 , 17,130 shares in 2016 , and 26,450 shares in 2015 of nonvested restricted stock 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 yielded a more dilutive result than the treasury-stock method. The following table illustrates the earnings allocation method utilized in the calculation of basic and diluted earnings per share. Years Ended December 31, (in thousands, except per-share amounts) 2017 2016 2015 Earnings per share numerator: Net income attributable to common shareholders before allocation of earnings to participating securities $ 190,509 $ 243,441 $ 238,603 Earnings allocated to participating securities 356 477 482 Net income attributable to common shareholders after allocation of earnings to participating securities $ 190,153 $ 242,964 $ 238,121 Earnings per share denominator: Weighted-average number of shares of common stock outstanding - basic and diluted 11,824 11,828 12,241 Earnings per share - basic and diluted $ 16.08 $ 20.54 $ 19.45

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Information	Supplemental Cash Flow Information Years Ended December 31, (in thousands) 2017 2016 2015 Cash paid during the year for Interest and financing expenses (net of capitalization) $ 20,376 $ 18,775 $ 16,193 Income taxes 59,010 60,998 99,006 Supplemental disclosure of non-cash transactions: Release of deposit account funds to terminate interest rate swap $ 0 $ 21,868 $ 0 Non-cash additions to property, plant, and equipment 11,209 8,762 13,959 Non-cash obligation under capital lease 1,341 4,810 0

Trade and Other Accounts Receiv

Trade and Other Accounts Receivable, Net	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Trade and Other Accounts Receivable, Net	Trade and Other Accounts Receivable, Net December 31, (in thousands) 2017 2016 Trade receivables $ 310,941 $ 265,991 Income tax receivables 7,455 26,189 Other 16,921 14,736 $ 335,317 $ 306,916

Inventories

Inventories	12 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
Inventories	Inventories December 31, (in thousands) 2017 2016 Finished goods and work-in-process $ 319,036 $ 254,068 Raw materials 51,485 45,581 Stores, supplies, and other 12,576 11,863 $ 383,097 $ 311,512 Our U.S. finished goods, work-in-process, and raw materials inventories, which are stated on the LIFO basis, amounted to $128 million at December 31, 2017 , which was below replacement cost by approximately $49 million . At December 31, 2016 , LIFO basis inventories were $130 million , which was approximately $39 million below replacement cost. Our foreign inventories amounted to $244 million at December 31, 2017 and $176 million at December 31, 2016 . Reserves for obsolete and slow-moving inventory included in the table above were not material at December 31, 2017 or December 31, 2016 .

Prepaid Expenses and Other Curr

Prepaid Expenses and Other Current Assets	12 Months Ended
	Dec. 31, 2017
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid Expenses and Other Current Assets	Prepaid Expenses and Other Current Assets December 31, (in thousands) 2017 2016 Dividend funding $ 19,055 $ 17,478 Income taxes on intercompany profit 6,866 3,954 Other 5,153 4,869 $ 31,074 $ 26,301

Property, Plant, and Equipment,

Property, Plant, and Equipment, at Cost	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Property, Plant, and Equipment, at Cost	Property, Plant, and Equipment, at Cost December 31, (in thousands) 2017 2016 Land $ 42,067 $ 40,190 Land improvements 45,144 44,048 Leasehold improvements 1,636 1,510 Buildings 170,624 161,512 Machinery and equipment 1,043,194 915,423 Construction in progress 172,297 102,274 $ 1,474,962 $ 1,264,957 We depreciate the cost of property, plant, and equipment by the straight-line method over the following estimated useful lives: Land improvements 5 - 30 years Buildings 10 - 48 years Machinery and equipment 3 - 20 years Depreciation expense was $51 million in 2017 , $42 million in 2016 , and $35 million in 2015 .

Intangibles (Net of Amortizatio

Intangibles (Net of Amortization) and Goodwill	12 Months Ended
	Dec. 31, 2017
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 $144 million at December 31, 2017 and $10 million at December 31, 2016 . The gross carrying amount and accumulated amortization of each type of intangible asset and goodwill are presented in the table below. December 31, 2017 2016 (in thousands) Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Amortizing intangible assets Formulas and technology $ 12,339 $ 3,280 $ 2,678 $ 1,958 Contract 2,000 200 2,000 0 Customer bases 15,759 5,140 6,938 3,961 Trademarks and trade names 1,531 1,213 1,513 1,069 Goodwill 122,541 4,295 $ 154,170 $ 9,833 $ 17,424 $ 6,988 Aggregate amortization expense $ 2,845 $ 1,860 Aggregate amortization expense was $6 million in 2015 . All of the intangibles relate to the petroleum additives segment. The change in the gross carrying amount between 2016 and 2017 is primarily due to additional goodwill and identifiable intangibles from the acquisition of AMSA, as well as foreign currency fluctuations. The additional goodwill and identifiable intangibles from the acquisition of AMSA are preliminary and are subject to adjustment if additional information is obtained about facts that existed as of the acquisition date. The final determination of the fair values will be completed within the measurement period of up to one year from the acquisition date. See Note 2 for further information. There is no accumulated goodwill impairment. Estimated annual amortization expense related to our intangible assets for the next five years is expected to be (in thousands): 2018 $ 7,651 2019 4,660 2020 3,024 2021 2,206 2022 1,473 We amortize the contract over 10 years ; customer bases over 4 years to 20 years ; formulas and technology over 3 years to 10 years ; and trademarks and trade names over 10 years .

Deferred Charges and Other Asse

Deferred Charges and Other Assets	12 Months Ended
	Dec. 31, 2017
Other Assets, Noncurrent [Abstract]
Deferred Charges and Other Assets	Deferred Charges and Other Assets December 31, (in thousands) 2017 2016 Asbestos insurance receivables $ 3,767 4,147 Deferred financing costs, net of amortization 2,614 1,414 Other 4,657 4,948 $ 11,038 $ 10,509 Deferred financing costs, net of amortization in the table above include only those costs associated with the revolving credit facility. The amount of deferred financing costs, net of amortization related to the 4.10% senior notes is reported as a component of long-term debt. See Note 12 for further information on our long-term debt.

Accrued Expenses

Accrued Expenses	12 Months Ended
	Dec. 31, 2017
Accrued Liabilities, Current [Abstract]
Accrued Expenses	Accrued Expenses December 31, (in thousands) 2017 2016 Employee benefits, payroll, and related taxes $ 36,252 $ 33,019 Customer rebates 20,703 20,944 Taxes other than income and payroll 5,398 6,046 Capital projects 6,316 18,779 Other 39,330 25,294 $ 107,999 $ 104,082

Long-term Debt

Long-term Debt	12 Months Ended
	Dec. 31, 2017
Long-term Debt and Capital Lease Obligations [Abstract]
Long-term Debt	Long-term Debt December 31, (in thousands) 2017 2016 Senior notes - 4.10% due 2022 (net of related deferred financing costs) $ 347,091 $ 346,505 Senior notes - 3.78% due 2029 250,000 0 Revolving credit facility 0 156,000 Capital lease obligations 5,809 4,770 $ 602,900 $ 507,275 4.10% Senior Notes – In 2012, we issued $350 million aggregate principal amount of 4.10% senior notes due 2022 at an issue price of 99.83% . The notes are senior unsecured obligations and are registered under the Securities Act of 1933. We incurred financing costs totaling approximately $5 million related to the 4.10% senior notes, which are being amortized over the term of the agreement. The 4.10% senior notes rank: • equal in right of payment with all of our existing and future senior unsecured indebtedness; and • senior in right of payment to any of our future subordinated indebtedness. The indenture governing the 4.10% senior notes contains covenants that, among other things, limit our ability and the ability of our subsidiaries to: • create or permit to exist liens; • enter into sale-leaseback transactions; • incur additional guarantees; and • sell all or substantially all of our assets or consolidate or merge with or into other companies. We were in compliance with all covenants under the indenture governing the 4.10% senior notes as of December 31, 2017 and December 31, 2016 . 3.78% Senior Notes – On January 4, 2017, we issued $250 million in senior unsecured notes in a private placement with The Prudential Insurance Company of America and certain other purchasers. These notes bear interest at 3.78% and mature on January 4, 2029 . Interest is payable semiannually and principal payments of $50 million are payable annually beginning on January 4, 2025. We have the right to make optional prepayments on the notes at any time, subject to certain limitations. The note purchase agreement contains representations, warranties, terms and conditions customary for transactions of this type. These 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. We were in compliance with all covenants under the 3.78% senior notes as of December 31, 2017 . Revolving Credit Facility – On September 22, 2017, we entered into a Credit Agreement (Credit Agreement) with a term of five years . The Credit Agreement provides for an $850 million , multicurrency revolving credit facility, with a $150 million sublimit for multicurrency borrowings, a $75 million sublimit for letters of credit, and a $20 million sublimit for swingline loans. The Credit Agreement includes an expansion feature which allows us, subject to certain conditions, to request an increase to the aggregate amount of the revolving credit facility or obtain incremental term loans in an amount up to $425 million . In addition, the Credit Agreement includes provisions that allow certain of our foreign subsidiaries to borrow under the agreement. Concurrent with entering into the Credit Agreement, we terminated our former revolving credit facility that we had entered into in 2014. There were no outstanding borrowings under the Credit Agreement at December 31, 2017 . At December 31, 2016 , the outstanding borrowings under our former revolving credit facility amounted to $156 million . We paid financing costs in 2017 of approximately $ 1.9 million related to this revolving credit facility and carried over deferred financing costs from our previous revolving credit facility of approximately $ 0.9 million , resulting in total deferred financing costs of $2.8 million as of December 31, 2017 , which we are amortizing over the term of the Credit Agreement. Deferred financing costs from our former revolving credit facility of approximately $0.2 million were written off when we entered into our current revolving credit facility. The obligations under the Credit Agreement are unsecured and fully guaranteed by NewMarket. The revolving credit facility matures on September 22, 2022 . Borrowings made under the revolving credit facility bear interest, at our option, at an annual rate equal to either (1) the Alternate Base Rate (ABR) plus the Applicable Rate (as defined in the Credit Agreement) (solely in the case of loans denominated in U.S. dollars to NewMarket) or (2) the Adjusted LIBO Rate plus the Applicable Rate. ABR is the greater of (i) the rate of interest publicly announced by the Administrative Agent as its prime rate, (ii) the NYFRB Rate (as defined in the credit Agreement) from time to time plus 0.5% , and (iii) the Adjusted LIBO Rate for a one month interest period plus 1% . The Adjusted LIBO Rate means the rate at which Eurocurrency deposits in the London interbank market for certain periods (as selected by NewMarket) are quoted, as adjusted for statutory reserve requirements for Eurocurrency liabilities and other applicable mandatory costs. The Applicable Rate ranges from 0.0% to 0.625% (depending on our consolidated Leverage Ratio or Credit Ratings) for loans bearing interest based on the ABR. The Applicable Rate ranges from 1.00% to 1.625% (depending on our Leverage Ratio or Credit Ratings) for loans bearing interest based on the Adjusted LIBO Rate. At December 31, 2017, the Applicable Rate was 0.125% for loans bearing interest based on the ABR and 1.125% for loans bearing interest based on the Adjusted LIBO Rate. The Credit Agreement contains financial covenants that require NewMarket to maintain a consolidated Leverage Ratio (as defined in the Credit Agreement) of no more than 3.50 to 1.00 except during an Increased Leverage Period (as defined in the Credit Agreement) at the end of each quarter, and a consolidated Interest Coverage Ratio (as defined in the Credit Agreement) of no less than 3.00 to 1.00 , calculated on a rolling four quarter basis, as of the end of each fiscal quarter. We were in compliance with all covenants under the revolving credit facility at December 31, 2017 and the former revolving credit facility at December 31, 2016 . The following table provides information related to the unused portion of our revolving credit facility in effect at December 31, 2017 and December 31, 2016 : December 31, (in thousands) 2017 2016 Maximum borrowing capacity under the revolving credit facility $ 850,000 $ 650,000 Outstanding borrowings under the revolving credit facility 0 156,000 Outstanding letters of credit 2,830 3,483 Unused portion of revolving credit facility $ 847,170 $ 490,517 The average interest rate for borrowings under our revolving credit facilities was 2.5% during 2017 and 1.9% during 2016 . The average interest rate on outstanding borrowings was 2.1% at December 31, 2016 . Capital Lease Obligations – The capital lease obligations are related to the Singapore manufacturing facility.

Other Noncurrent Liabilities

Other Noncurrent Liabilities	12 Months Ended
	Dec. 31, 2017
Other Liabilities, Noncurrent [Abstract]
Other Noncurrent Liabilities	Other Noncurrent Liabilities December 31, (in thousands) 2017 2016 Employee benefits $ 89,116 $ 81,377 Deferred income taxes 35,303 9,234 Deemed repatriation of earnings 26,901 0 Environmental remediation 11,753 13,796 Asbestos litigation reserve 8,251 9,710 Other 19,488 17,203 $ 190,812 $ 131,320

Stock-based Compensation

Stock-based Compensation	12 Months Ended
	Dec. 31, 2017
Share-based Compensation [Abstract]
Stock-based Compensation	Stock-based Compensation The 2014 Incentive Compensation and Stock Plan (the Plan) was approved on April 24, 2014. Any employee of our company or an affiliate or a person who is a member of our Board of Directors or the board of directors of an affiliate is eligible to participate in the Plan if the Compensation Committee of the Board of Directors (the Administrator), in its sole discretion, determines that such person has contributed or can be expected to contribute to the profits or growth of our company or its affiliates (each, a participant). Under the terms of the Plan, we may grant participants stock awards, incentive awards, stock units, or options (which may be either incentive stock options or nonqualified stock options), or stock appreciation rights (SARs), which may be granted with a related option. Stock options entitle the participant to purchase a specified number of shares of our common stock at a price that is fixed by the Administrator at the time the option is granted; provided, however, that the price cannot be less than the shares’ fair market value on the date of grant. The maximum period in which an option may be exercised is fixed by the Administrator at the time the option is granted but, in the case of an incentive stock option, cannot exceed ten years. No participant may be granted or awarded, in any calendar year, shares, options, SARs, or stock units covering more than 200,000 shares of our common stock in the aggregate. For purposes of this limitation and the individual limitation on the grant of options, an option and corresponding SAR are treated as a single award. The maximum aggregate number of shares of our common stock that may be issued under the Plan is 1,000,000 . At December 31, 2017 , 974,044 shares were available for grant. During 2017 , we granted 650 shares to five of our non-employee directors, which vested immediately. A summary of activity during 2017 related to NewMarket’s restricted stock and restricted stock units (stock awards) is presented below in whole shares: Number of Shares Weighted Average Grant-Date Fair Value Unvested stock awards at January 1, 2017 18,114 $ 379.22 Granted in 2017 6,785 428.61 Vested in 2017 6,795 381.99 Forfeited in 2017 467 378.09 Unvested stock awards at December 31, 2017 17,637 397.18 The weighted average grant-date fair value was $375.57 for stock awards granted in 2015 . No awards were granted in 2016 . The fair value of shares vested was $3 million in 2017 , $3 million in 2016 , and $4 million in 2015 . We recognized compensation expense of $3 million in 2017 , $3 million in 2016 , and $2 million in 2015 related to stock awards. At December 31, 2017 , total unrecognized compensation expense related to stock awards was $3 million , which is expected to be recognized over a period of 1.5 years .

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The carrying amount of cash and cash equivalents in the Consolidated Balance Sheets, as well as the fair value, was $84 million at December 31, 2017 and $192 million at December 31, 2016 . The fair value is categorized in Level 1 of the fair value hierarchy. Except for the acquisition of AMSA, no events occurred during 2017 requiring adjustment to the recognized balances of assets or liabilities which are recorded at fair value on a nonrecurring basis. See Note 2 for information on the acquisition of AMSA. Long-term debt - We record the carrying amount of our long-term debt at historical cost, less deferred financing costs related to the 4.10% senior notes. 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 4.10% senior notes included in long-term debt in the table below is based on the last quoted price closest to December 31, 2017 . The fair value of our debt instruments is categorized as Level 2. December 31, 2017 December 31, 2016 (in thousands) Carrying Amount Fair Value Carrying Amount Fair Value Long-term debt (excluding capital lease obligation) $ 597,091 $ 623,557 $ 502,505 $ 507,925

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Contractual Commitments —NewMarket has operating lease agreements primarily for office space, land, transportation equipment, and storage facilities. Rental expense was $33 million in 2017 , $33 million in 2016 , and $34 million in 2015 . Future lease payments for all noncancelable operating leases as of December 31, 2017 are (in thousands): 2018 $ 14,520 2019 11,328 2020 8,000 2021 5,169 2022 3,461 After 2022 19,206 We have contractual obligations for the construction of assets, as well as purchases of property and equipment, of approximately $26 million at December 31, 2017 , all of which are due within five years . Purchase Obligations —We have purchase obligations for goods or services that are enforceable, legally binding, and specify all significant terms, including: fixed or minimum quantities to be purchased; fixed, minimum, or variable price provisions; and the approximate timing of the transaction. Purchase obligations exclude agreements that are cancelable without penalty. Purchase orders made in the ordinary course of business are excluded from this amount. Any amounts for which we are liable under purchase orders are reflected in our Consolidated Balance Sheets as accounts payable or accrued expenses. Future payments for purchase obligations as of December 31, 2017 are (in thousands): 2018 $ 193,821 2019 197,235 2020 200,115 2021 196,849 2022 185,956 After 2022 113,310 Litigation —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 and Item 1 of this Form 10-K. 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. In late 2013, Afton initiated a voluntary self-audit of its compliance with certain sections of the TSCA under the EPA’s Audit Policy. If any potential TSCA violations are discovered during the audit, we would voluntarily disclose them to the EPA under the Audit Policy. In August 2014, the EPA staff began its own TSCA inspection of both Afton and Ethyl. While it is not possible to predict or determine with certainty the outcome, we do not believe that any findings identified as a result of our audit or the EPA’s TSCA inspection will have a material adverse effect on our consolidated results of operations, financial condition, or cash flows. Asbestos We are a defendant in personal injury lawsuits involving exposure to asbestos. These cases involve exposure to asbestos in premises owned or operated, or formerly owned or operated, by subsidiaries of NewMarket. We have never manufactured, sold, or distributed products that contain asbestos. Nearly all of these cases are pending in Texas, Louisiana, or Illinois and involve multiple defendants. We maintain an accrual for these proceedings, as well as a receivable for expected insurance recoveries. The accrual for our premises asbestos liability related to currently asserted claims is based on the following assumptions and factors: • We are often one of many defendants. This factor influences both the number of claims settled against us and the indemnity cost associated with such resolutions. • The estimated percent of claimants in each case that, after discovery, will actually make a claim against us, out of the total number of claimants in a case, is based on a level consistent with past experience and current trends. • We utilize average comparable plaintiff cost history as the basis for estimating pending premises asbestos related claims. These claims are filed by both former contractors and former employees who worked at past and present company locations. We also include an estimated inflation factor in the calculation. • No estimate is made for unasserted claims. • The estimated recoveries from insurance and Albemarle Corporation (a former operation of our company) for these cases are based on, and are consistent with, the 2005 settlement agreements with Travelers Indemnity Company. Based on the above assumptions, we have provided an undiscounted liability related to premises asbestos claims of $10 million at December 31, 2017 and $11 million December 31, 2016 . The liabilities related to asbestos claims are included in accrued expenses (current portion) and other noncurrent liabilities on the Consolidated Balance Sheets. Certain of these costs are recoverable through the settlement agreement with The Travelers Indemnity Company, as well as an agreement with Albemarle Corporation. The receivable for these recoveries related to premises asbestos liabilities was $5 million at both December 31, 2017 and December 31, 2016 . These receivables are included in trade and other accounts receivable, net on the Consolidated Balance Sheets for the current portion. The noncurrent portion is included in deferred charges and other assets. 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 (PRP). 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 financial position, results of operations, and cash flows. Our total accruals for environmental remediation, dismantling, and decontamination were approximately $14 million at December 31, 2017 and $16 million at December 31, 2016 . Of the total accrual, the current portion is included in accrued expenses and the noncurrent portion is included in other noncurrent liabilities on the Consolidated Balance Sheets. Our more significant environmental sites include a former TEL plant site in Louisiana (the Louisiana site) and a Houston, Texas plant site (the Texas site). Together, the amounts accrued on a discounted basis related to these sites represented approximately $7 million of the total accrual above at December 31, 2017 , using discount rates ranging from 4% to 9% , and $10 million of the total accrual above at December 31, 2016 , using discount rates ranging from 4% to 9% . The aggregate undiscounted amount for these sites was $10 million at December 31, 2017 and $13 million at December 31, 2016 . Of the total accrued for these two sites, the amount related to remediation of groundwater and soil was $3 million for the Louisiana site and $4 million for the Texas site at December 31, 2017 and $4 million for the Louisiana site and $5 million for the Texas site at December 31, 2016 . In 2000, the EPA named us as a PRP under Superfund law for the clean-up of soil and groundwater contamination at the five grouped disposal sites known as "Sauget Area 2 Sites" in Sauget, Illinois. Without admitting any fact, responsibility, fault, or liability in connection with this site, we are participating with other PRPs in site investigations and feasibility studies. In December 2013, the EPA issued its ROD confirming its remedies for the selected Sauget Area 2 sites. In August 2017, the EPA issued a Special Notice Letter to over 75 PRPs notifying them of potential liability and encouraging the PRPs to voluntarily perform or finance the response actions detailed in the ROD. We have accrued our estimated proportional share of the remedial costs and expenses addressed in the ROD. We do not believe there is any additional information available as a basis for revision of the liability that we have established at December 31, 2017 . The amount accrued for this site is not material.

Pension Plans and Other Postret

Pension Plans and Other Postretirement Benefits	12 Months Ended
	Dec. 31, 2017
Retirement Benefits [Abstract]
Pension Plans and Other Postretirement Benefits	Pension Plans and Other Postretirement Benefits NewMarket uses a December 31 measurement date for all of our plans. U.S. Retirement Plans NewMarket sponsors four pension plans for all full-time U.S. employees that offer a benefit based primarily on years of service and compensation. Employees do not contribute to these pension plans. The plans are as follows: • Salaried employees pension plan; • Afton pension plan for union employees (the Sauget plan); • NewMarket retirement income plan for union employees in Houston, Texas (the Houston plan); and • Afton Chemical Additives pension plan for union employees in Port Arthur, Texas (the Port Arthur plan). In addition, we offer an unfunded, nonqualified supplemental pension plan. This plan restores the pension benefits from our regular pension plans that would have been payable to designated participants if it were not for limitations imposed by U.S. federal income tax regulations. We also provide postretirement health care benefits and life insurance to eligible retired employees. A plan amendment, with an effective date of January 1, 2016, was made in 2015 to provide post-65 medical and prescription drug benefits to retirees through a private healthcare exchange with fixed subsidies to eligible retirees through a health reimbursement account. As a result, the postretirement plan liabilities were remeasured at September 1, 2015 resulting in a non-cash improvement in the funded position. The adjustment to accumulated other comprehensive loss is reflected in prior service cost (credit) and is being amortized into expense. The components of net periodic pension and postretirement benefit cost (income), as well as other amounts recognized in other comprehensive income (loss), are shown below. Years Ended December 31, Pension Benefits Postretirement Benefits (in thousands) 2017 2016 2015 2017 2016 2015 Net periodic benefit cost (income) Service cost $ 13,679 $ 12,860 $ 13,034 $ 774 $ 705 $ 2,244 Interest cost 13,289 13,175 11,938 1,582 1,653 2,548 Expected return on plan assets (26,146 ) (23,137 ) (20,467 ) (1,197 ) (1,239 ) (1,288 ) Amortization of prior service cost (credit) 26 187 99 (3,029 ) (3,028 ) (1,008 ) Amortization of actuarial net (gain) loss 4,725 5,243 6,891 0 0 0 Net periodic benefit cost (income) 5,573 8,328 11,495 (1,870 ) (1,909 ) 2,496 Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss) Actuarial net (gain) loss (13,386 ) 9,140 11,095 2,635 156 (1,826 ) Prior service cost (credit) 0 749 0 0 0 (35,768 ) Amortization of actuarial net gain (loss) (4,725 ) (5,243 ) (6,891 ) 0 0 0 Amortization of prior service (cost) credit (26 ) (187 ) (99 ) 3,029 3,028 1,008 Total recognized in other comprehensive income (loss) (18,137 ) 4,459 4,105 5,664 3,184 (36,586 ) Total recognized in net periodic benefit cost (income) and other comprehensive income (loss) $ (12,564 ) $ 12,787 $ 15,600 $ 3,794 $ 1,275 $ (34,090 ) The estimated actuarial net loss to be amortized from accumulated other comprehensive loss into net periodic benefit cost (income) during 2018 is expected to be $5 million for pension plans. The estimated prior service cost to be amortized from accumulated other comprehensive loss into net periodic benefit cost (income) during 2018 is not expected to be material for pension plans. The estimated prior service credit to be amortized from accumulated other comprehensive loss into net periodic benefit cost (income) during 2018 related to postretirement benefits is expected to be $3 million . Changes in the plans’ benefit obligations and assets follow. December 31, Pension Benefits Postretirement Benefits (in thousands) 2017 2016 2017 2016 Change in benefit obligation Benefit obligation at beginning of year $ 316,366 $ 292,728 $ 38,110 $ 38,517 Service cost 13,679 12,860 774 705 Interest cost 13,289 13,175 1,582 1,653 Actuarial net (gain) loss 25,828 6,087 2,506 (322 ) Plan amendment 0 748 0 0 Benefits paid (10,350 ) (9,232 ) (2,534 ) (2,443 ) Benefit obligation at end of year 358,812 316,366 40,438 38,110 Change in plan assets Fair value of plan assets at beginning of year 291,092 260,911 23,238 23,972 Actual return on plan assets 65,360 20,083 1,067 761 Employer contributions 19,319 19,330 1,133 948 Benefits paid (10,350 ) (9,232 ) (2,534 ) (2,443 ) Fair value of plan assets at end of year 365,421 291,092 22,904 23,238 Funded status $ 6,609 $ (25,274 ) $ (17,534 ) $ (14,872 ) Amounts recognized in the Consolidated Balance Sheets Noncurrent assets $ 48,515 $ 15,188 $ 0 $ 0 Current liabilities (2,793 ) (2,781 ) (1,278 ) (1,313 ) Noncurrent liabilities (39,113 ) (37,681 ) (16,256 ) (13,559 ) $ 6,609 $ (25,274 ) $ (17,534 ) $ (14,872 ) Amounts recognized in accumulated other comprehensive loss Actuarial net (gain) loss $ 88,950 $ 107,061 $ 1,710 $ (925 ) Prior service cost (credit) 32 58 (28,703 ) (31,732 ) $ 88,982 $ 107,119 $ (26,993 ) $ (32,657 ) The accumulated benefit obligation for all domestic defined benefit pension plans was $307 million at December 31, 2017 and $272 million at December 31, 2016 . The fair market value of plan assets exceeded the accumulated benefit obligation for all domestic plans, except the nonqualified plan, at December 31, 2017 and December 31, 2016 . The fair market value of plan assets exceeded the projected benefit obligation for all domestic plans, except the nonqualified plan, at December 31, 2017 and December 31, 2016 . The net asset position for plans in which assets exceed the projected benefit obligation is included in prepaid pension cost on the Consolidated Balance Sheets. The net liability position of plans in which the projected benefit obligation exceeds assets is included in other noncurrent liabilities on the Consolidated Balance Sheets. A portion of the accrued benefit cost for the nonqualified plan is included in current liabilities at both December 31, 2017 and December 31, 2016 . As the nonqualified plan is unfunded, the amount reflected in current liabilities represents the expected benefit payments related to the nonqualified plan during 2018 . The first table below shows information on domestic pension plans with the accumulated benefit obligation in excess of plan assets. The second table presents information on domestic pension plans with the projected benefit obligation in excess of plan assets. December 31, (in thousands) 2017 2016 Plans with the accumulated benefit obligation in excess of the fair market value of plan assets Projected benefit obligation $ 41,906 $ 40,462 Accumulated benefit obligation 38,105 35,939 Fair market value of plan assets 0 0 December 31, (in thousands) 2017 2016 Plans with the projected benefit obligation in excess of the fair market value of plan assets Projected benefit obligation $ 41,906 $ 40,462 Fair market value of plan assets 0 0 There are no assets held by the trustee for the retired beneficiaries of the nonqualified plan. Payments to retired beneficiaries of the nonqualified plan are made with cash from operations. Assumptions —We used the following assumptions to calculate the results of our retirement plans: Pension Benefits Postretirement Benefits 2017 2016 2015 2017 2016 2015 Weighted-average assumptions used to determine net periodic benefit cost (income) for years ended December 31, Discount rate 4.250 % 4.500 % 4.125 % 4.250 % 4.500 % 4.125 % Expected long-term rate of return on plan assets 8.50 % 8.50 % 8.50 % 5.50 % 5.50 % 5.50 % Rate of projected compensation increase 3.50 % 3.50 % 3.50 % Weighted-average assumptions used to determine benefit obligations at December 31, Discount rate 3.750 % 4.250 % 4.500 % 3.750 % 4.250 % 4.500 % Rate of projected compensation increase 3.50 % 3.50 % 3.50 % For pension plans, we base the assumed expected long-term rate of return for plan assets on an analysis of our actual investments, including our asset allocation, as well as an analysis of expected returns. This analysis reflects the expected long-term rates of return for each significant asset class and economic indicator. As of January 1, 2018 , the expected rates were 8.5% for U.S. large cap stocks, 4.1% for fixed income, and 3.1% for inflation. The range of returns relies both on forecasts and on broad-market historical benchmarks for expected return, correlation, and volatility for each asset class. Our asset allocation is predominantly weighted toward equities. Through our ongoing monitoring of our investments and review of market data, we have determined that we should maintain the expected long-term rate of return for our U.S. plans at 8.5% at December 31, 2017 . For the postretirement plan, we based the assumed expected long-term rate of return for plan assets on an evaluation of projected interest rates, as well as the guaranteed interest rate for our insurance contract. Plan Assets —Pension plan assets are held and distributed by trusts and consist principally of equity securities and investment-grade fixed income securities. We invest directly in equity securities, as well as in funds which primarily hold equity and debt securities. Our target allocation is 90% to 97% in equities, 3% to 10% in debt securities and 1% to 5% in cash. The pension obligation is long-term in nature and the investment philosophy followed by the Pension Investment Committee is likewise long-term in its approach. The majority of the pension funds are invested in equity securities as historically, equity securities have outperformed debt securities and cash investments, resulting in a higher investment return over the long-term. While in the short-term, equity securities may underperform other investment classes, we are less concerned with short-term results and more concerned with long-term improvement. The pension funds are managed by five different investment companies who predominantly invest in U.S. and international equities. Each investment company’s performance is reviewed quarterly. A small portion of the funds is in investments such as cash or short-term bonds, which historically has been less vulnerable to short-term market swings. These funds are used to provide the cash needed to meet our monthly obligations. There are no significant concentrations of risk within plan assets, nor do the equity securities include any NewMarket common stock for any year presented. The assets of the postretirement benefit plan are invested completely in an insurance contract held by Metropolitan Life. No NewMarket common stock is included in these assets. The following table provides information on the fair value of our pension and postretirement benefit plans assets, as well as the related level within the fair value hierarchy. Investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified by level in the fair value hierarchy. December 31, 2017 December 31, 2016 Fair Value Measurements Using Fair Value Measurements Using (in thousands) Fair Value Level 1 Level 2 Level 3 Fair Value Level 1 Level 2 Level 3 Pension Plans Equity securities: U. S. companies $ 286,103 $ 286,103 $ 0 $ 0 $ 232,895 $ 232,895 $ 0 $ 0 International companies 2,074 2,074 0 0 1,757 1,757 0 0 Real estate investment trusts 3,487 3,487 0 0 2,653 2,653 0 0 Money market instruments 18,395 18,395 0 0 11,120 11,120 0 0 Pooled investment funds: Fixed income securities—mutual funds 8,958 8,958 0 0 8,799 8,799 0 0 International equities—mutual fund 16,715 16,715 0 0 13,104 13,104 0 0 Common collective trusts measured at net asset value 26,084 19,780 Insurance contract 3,605 0 3,605 0 984 0 984 0 $ 365,421 $ 335,732 $ 3,605 $ 0 $ 291,092 $ 270,328 $ 984 $ 0 Postretirement Plans Insurance contract $ 22,904 $ 0 $ 22,904 $ 0 $ 23,238 $ 0 $ 23,238 $ 0 The valuation methodologies used to develop the fair value measurements for the investments in the table above is outlined below. There have been no changes in the valuation techniques used to value the investments. • Equity securities, including common stock and real estate investment trusts, are valued at the closing price reported on a national exchange. • Money market instruments are valued at cost, which approximates fair value. • Pooled investment funds—Mutual funds are valued at the closing price reported on a national exchange. • The common collective trusts (the trusts) are valued at the net asset value of units held based on the quoted market value of the underlying investments held by the funds. One of the trusts invests primarily in a diversified portfolio of equity securities of companies located outside of the United States and Canada, as determined by a company's jurisdiction of incorporation. We may make withdrawals from this trust on the first business day of each month with at least ten business days' notice. The other trust invests primarily in a diversified portfolio of equity securities included in the S&P 500 index. There are no restrictions on redemption for the trusts and there were no unfunded commitments. • Cash and cash equivalents are valued at cost. • The insurance contracts are unallocated funds deposited with an insurance company and are stated at an amount equal to the sum of all amounts deposited less the sum of all amounts withdrawn, adjusted for investment return. Cash Flows —For U.S. plans, NewMarket expects to contribute $19 million to our pension plans in 2018 . Contributions to our postretirement benefit plans are not expected to be material. The expected benefit payments for the next ten years are as follows. (in thousands) Expected Pension Benefit Payments Expected Postretirement Benefit Payments 2018 $ 11,404 $ 2,815 2019 12,426 2,659 2020 13,227 2,511 2021 14,256 2,391 2022 15,154 2,278 2023 through 2027 92,183 10,277 Foreign Retirement Plans For most employees of our foreign subsidiaries, NewMarket has defined benefit pension plans that offer benefits based primarily on years of service and compensation. These defined benefit plans provide benefits for employees of our foreign subsidiaries located in Belgium, the United Kingdom, Germany, Canada, and Mexico. NewMarket generally contributes to investment trusts and insurance accounts to provide for these plans. The components of net periodic pension cost (income), as well as other amounts recognized in other comprehensive income (loss), for these foreign defined benefit pension plans are shown below. Years Ended December 31, (in thousands) 2017 2016 2015 Net periodic benefit cost (income) Service cost $ 7,437 $ 6,926 $ 8,150 Interest cost 4,314 4,915 4,932 Expected return on plan assets (8,479 ) (6,638 ) (7,077 ) Amortization of prior service cost (credit) (79 ) (83 ) (95 ) Amortization of actuarial net (gain) loss 959 1,021 1,587 Net periodic benefit cost (income) 4,152 6,141 7,497 Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss) Actuarial net (gain) loss (3,029 ) 3,215 (5,461 ) Amortization of actuarial net gain (loss) (959 ) (1,021 ) (1,587 ) Amortization of prior service (cost) credit 79 83 95 Total recognized in other comprehensive income (loss) (3,909 ) 2,277 (6,953 ) Total recognized in net periodic benefit cost (income) and other comprehensive income (loss) $ 243 $ 8,418 $ 544 The estimated actuarial net loss to be amortized from accumulated other comprehensive loss into net periodic benefit cost (income) during 2018 is expected to be $1 million . The estimated prior service credit to be amortized from accumulated other comprehensive loss into net periodic benefit cost (income) during 2018 is not expected to be material. Changes in the benefit obligations and assets of the foreign defined benefit pension plans follow. December 31, (in thousands) 2017 2016 Change in benefit obligation Benefit obligation at beginning of year $ 157,101 $ 146,748 Service cost 7,437 6,926 Interest cost 4,314 4,915 Acquisition 1,888 0 Employee contributions 766 832 Actuarial net (gain) loss 2,417 25,794 Benefits paid (5,157 ) (3,501 ) Foreign currency translation 17,049 (24,613 ) Benefit obligation at end of year 185,815 157,101 Change in plan assets Fair value of plan assets at beginning of year 144,877 138,646 Actual return on plan assets 13,778 29,026 Employer contributions 5,646 5,441 Employee contributions 766 832 Benefits paid (5,157 ) (3,501 ) Acquisition 1,910 0 Foreign currency translation 15,148 (25,567 ) Fair value of plan assets at end of year 176,968 144,877 Funded status $ (8,847 ) $ (12,224 ) Amounts recognized in the Consolidated Balance Sheets Noncurrent assets $ 17,980 $ 10,612 Current liabilities (346 ) (295 ) Noncurrent liabilities (26,481 ) (22,541 ) $ (8,847 ) $ (12,224 ) Amounts recognized in accumulated other comprehensive loss Actuarial net (gain) loss $ 38,831 $ 42,809 Prior service cost (credit) 118 39 Transition obligation 0 10 $ 38,949 $ 42,858 The accumulated benefit obligation for all foreign defined benefit pension plans was $155 million at December 31, 2017 and $132 million at December 31, 2016 . The fair market value of plan assets exceeded both the accumulated benefit obligation and projected benefit obligation for the United Kingdom and the Canadian Salary plans at both year-end 2017 and 2016. The net asset position of the United Kingdom and Canadian Salary plans are included in prepaid pension cost on the Consolidated Balance Sheets at December 31, 2017 and December 31, 2016. The accumulated benefit obligation and projected benefit obligation exceeded the fair market value of plan assets for the German and Belgian plans at December 31, 2017 and for the German, Belgian, and Mexican plans at December 31, 2016. For the two Mexican plans, the fair market value of plan assets exceeded the accumulated benefit obligation but not the projected benefit obligation at December 31, 2017. The accrued benefit cost of these plans is included in other noncurrent liabilities on the Consolidated Balance Sheets. As the German plan is unfunded, a portion of the accrued benefit cost for the German plan is included in current liabilities at year-end 2017 and 2016, reflecting the expected benefit payments related to the plan for the following year. The first table below shows information on foreign pension plans with the accumulated benefit obligation in excess of plan assets. The second table shows information on foreign pension plans with the projected benefit obligation in excess of plan assets. December 31, (in thousands) 2017 2016 Plans with the accumulated benefit obligation in excess of the fair market value of plan assets Projected benefit obligation $ 36,687 $ 32,407 Accumulated benefit obligation 23,704 21,310 Fair market value of plan assets 10,151 9,568 December 31, (in thousands) 2017 2016 Plans with the projected benefit obligation in excess of the fair market value of plan assets Projected benefit obligation $ 39,074 $ 32,407 Fair market value of plan assets 12,247 9,568 Assumptions —The information in the table below provides the weighted-average assumptions used to calculate the results of our foreign defined benefit pension plans. 2017 2016 2015 Weighted-average assumptions used to determine net periodic benefit cost (income) for the years ended December 31, Discount rate 2.53 % 3.58 % 3.11 % Expected long-term rate of return on plan assets 5.50 % 5.10 % 5.03 % Rate of projected compensation increase 4.20 % 4.28 % 4.27 % Weighted-average assumptions used to determine benefit obligations at December 31, Discount rate 2.36 % 2.53 % 3.58 % Rate of projected compensation increase 4.14 % 4.20 % 4.28 % The actuarial assumptions used by the various foreign locations are based upon the circumstances of each particular country and pension plan. The factors impacting the determination of the long-term rate of return for a particular foreign pension plan include the market conditions within a particular country, as well as the investment strategy and asset allocation of the specific plan. Plan Assets —Pension plan assets vary by foreign location and plan. Assets are held and distributed by trusts and, depending upon the foreign location and plan, consist primarily of pooled equity funds, pooled debt securities funds, pooled diversified funds, equity securities, debt securities, cash, and insurance contracts. The combined weighted-average target allocation of our foreign pension plans is 38% in equities (including pooled funds), 37% in debt securities (including pooled funds), 6% in insurance contracts, and 19% in pooled diversified funds. While the pension obligation is long-term in nature for each of our foreign plans, the investment strategies followed by each plan vary to some degree based upon the laws of a particular country, as well as the provisions of the specific pension trust. The United Kingdom and Canadian plans are invested predominantly in equity securities funds, diversified funds, and debt securities funds. The funds of these plans are managed by various trustees and investment companies whose performance is reviewed throughout the year. The Belgian plan is invested in an insurance contract. The Mexican plans are invested in various mutual funds, equities, and debt securities. The German plan has no assets. There are no significant concentrations of risk within plan assets, nor do the equity securities include any NewMarket common stock for any year presented. The following table provides information on the fair value of our foreign pension plans assets, as well as the related level within the fair value hierarchy. Investments that are measured at fair value using net asset value per share (or its equivalent) have not been classified by level in the fair value hierarchy. December 31, 2017 December 31, 2016 Fair Value Measurements Using Fair Value Measurements Using (in thousands) Fair Value Level 1 Level 2 Level 3 Fair Value Level 1 Level 2 Level 3 Insurance contract $ 10,151 $ 0 $ 10,151 $ 0 $ 9,399 $ 0 $ 9,399 $ 0 Equity securities—international companies 755 755 0 0 0 0 0 0 Debt securities 872 801 71 0 0 0 0 0 Pooled investment funds—mutual funds 469 469 0 0 169 169 0 0 Cash and cash equivalents 825 825 0 0 427 427 0 0 Pooled investment funds (measured at net asset value): Equity securities—U.S. companies 10,621 9,341 Equity securities—international companies 56,803 64,903 Debt securities 63,007 55,557 Diversified growth funds 33,465 0 Cash and cash equivalents 0 349 Property 0 4,732 $ 176,968 $ 2,850 $ 10,222 $ 0 $ 144,877 $ 596 $ 9,399 $ 0 The valuation methodologies used to develop the fair value measurements for the investments in the table above are outlined below. There have been no changes in the valuation techniques used to value the investments. • The insurance contract represents funds deposited with an insurance company and is stated at an amount equal to the sum of all amounts deposited less the sum of all amounts withdrawn, adjusted for investment return. • Equity securities are valued at the closing price reported on a national exchange. • Debt securities are valued by quoted market prices or valued based on yields currently available on comparable securities of issuers with similar credit ratings. • Pooled investment funds that are mutual funds are valued at the closing price reported on a national exchange. • Cash and cash equivalents are valued at cost. • The pooled investment funds are valued at the net asset value of units held by the plans based on the quoted market value of the underlying investments held by the fund. The United Kingdom pension plan is invested in units of life insurance policies that are linked to equity securities funds, government bond funds and diversified growth funds. The underlying assets of the equity funds, bond funds, and diversified growth funds are traded on a national exchange and are based on tracking various indices of the London Stock Exchange. There are no redemption restrictions on these funds. There were no unfunded commitments for the United Kingdom pension plan funds. The Canadian pension plan is invested in a pooled Canadian equity fund and a pooled diversified fund. The Canadian equity fund invests in a diversification (sector and industry) of equities listed on a recognized Canadian exchange. The diversified fund invests in a balanced portfolio of marketable securities and controls short-term risk by diversification in equities, bonds and cash. There are no redemption restrictions on the pooled Canadian funds and there were no unfunded commitments. Cash Flows —For foreign pension plans, NewMarket expects to contribute $6 million to the plans in 2018 . The expected benefit payments for the next ten years for our foreign pension plans are shown in the table below. (in thousands) Expected Pension Benefit Payments 2018 $ 4,061 2019 4,087 2020 4,540 2021 4,637 2022 3,773 2023 through 2027 28,938

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Tax Expense	Income Taxes On December 22, 2017, the U.S. enacted tax legislation commonly known as the Tax Cuts and Jobs Act (Tax Reform Act), which required a one-time transition tax in 2017 on the deemed repatriation of previously deferred foreign earnings and reduces the U.S. corporate tax rate to 21% beginning in 2018. As of December 31, 2017 , we have not fully completed our analysis of the impacts of the Tax Reform Act. However, we have recorded the effects of the reduced tax rate on our existing deferred tax balances and have estimated the one-time tax on deferred foreign earnings. We recognized $31 million of income tax expense in the year ended December 31, 2017 , as a result of the Tax Reform Act. This expense includes $32 million relating to the one-time tax on deferred foreign earnings, which we will elect to pay over an eight-year period, partially offset by $1 million of reductions to deferred tax liabilities. The amount recorded for the transition tax on foreign earnings that is due within the next 12 months has been recorded as an offset to trade and other accounts receivable, net in our Consolidated Balance Sheet at December 31, 2017. The remainder has been recorded in other noncurrent liabilities. Our estimate of the transition tax expense is based on currently available information and interpretations regarding the application of the new tax provisions. The U.S. Treasury, the Internal Revenue Service, and other standard-setting bodies could interpret or issue guidance regarding the provisions of the Tax Reform Act that differ from our interpretation, which could impact our provisional expense. Additional work is necessary to further analyze our historical foreign earnings and other items that affect the calculations. Adjustments to the provisional amounts recorded as of December 31, 2017 , will affect our tax expense or benefit from continuing operations in the period that adjustments are determined, which will be no later than the fourth quarter of 2018. Our income before income tax expense, as well as our provision for income taxes is shown in the table below. Years Ended December 31, (in thousands) 2017 2016 2015 Income before income tax expense Domestic $ 140,779 $ 161,687 $ 229,561 Foreign 174,663 181,521 109,410 $ 315,442 $ 343,208 $ 338,971 Income tax expense Current income taxes Federal $ 61,188 $ 34,213 $ 62,491 State 3,942 9,020 11,216 Foreign 32,428 37,349 26,511 97,558 80,582 100,218 Deferred income taxes Federal 15,901 13,876 1,287 State 3,633 3,095 (936 ) Foreign 7,841 2,214 (201 ) 27,375 19,185 150 Total income tax expense $ 124,933 $ 99,767 $ 100,368 The reconciliation of the U.S. federal statutory rate to the effective income tax rate follows: % of Income Before Income Tax Expense 2017 2016 2015 Federal statutory rate 35.0 % 35.0 % 35.0 % State taxes, net of federal tax 1.6 2.3 2.0 Foreign operations (4.4 ) (5.8 ) (4.3 ) Domestic research tax credit (1.1 ) (1.2 ) (1.2 ) Domestic manufacturing tax benefit (0.8 ) (0.8 ) (1.9 ) Deemed repatriation of foreign earnings 10.1 0.0 0.0 Other items and adjustments (0.8 ) (0.4 ) 0.0 Effective income tax rate 39.6 % 29.1 % 29.6 % Our deferred income tax assets and liabilities follow. December 31, (in thousands) 2017 2016 Deferred income tax assets Future employee benefits $ 8,039 $ 30,178 Environmental and future shutdown reserves 3,327 5,737 Operating loss and credit carryforwards 6,312 2,935 Trademark expenses 3,852 5,810 Foreign currency translation adjustments 3,993 6,687 Other 3,248 7,458 Gross deferred income tax assets 28,771 58,805 Valuation allowance (5,768 ) (2,935 ) Total deferred income tax assets 23,003 55,870 Deferred income tax liabilities Depreciation and amortization 45,128 29,736 Other 8,829 6,305 Total deferred tax liabilities 53,957 36,041 Net deferred income tax (liabilities) assets $ (30,954 ) $ 19,829 Reconciliation to financial statements Deferred income tax assets $ 4,349 $ 29,063 Deferred income tax liabilities 35,303 9,234 Net deferred income tax (liabilities) assets $ (30,954 ) $ 19,829 Deferred income tax liabilities are included in other noncurrent liabilities in our Consolidated Balance Sheets. Our deferred taxes are in a net liability position at December 31, 2017 . Our deferred tax assets include $6 million of foreign operating loss carryforwards and foreign and state tax credits. The loss carryforwards expire in 2019 through 2022 and certain tax credits expire in 2026. Based on current forecasted operating plans and historical profitability, we believe that we will recover the full benefit of our deferred tax assets with the exception of $6 million of certain credits and operating loss carryforwards. Therefore, as of December 31, 2017, we have recorded an offsetting valuation allowance against these items, as we do not believe we will be able to utilize these credits and operating loss carryforwards before expiration. The $3 million increase in operating loss and credit carryforwards, and the offsetting valuation allowance, during 2017 is primarily due to recording foreign tax credits as a result of the deemed repatriation of foreign earnings under the Tax Reform Act. A reconciliation of the beginning and ending balances of the unrecognized tax benefits from uncertain positions is as follows: December 31, (in thousands) 2017 2016 2015 Balance at beginning of year $ 8,810 $ 2,322 $ 1,465 Increases for tax positions of prior years 865 773 1,035 Decreases for tax positions of prior years 0 0 0 Increases for tax positions of the current year 453 5,826 533 Settlements (260 ) (111 ) (497 ) Lapses of statutes (766 ) 0 (214 ) Balance at end of year $ 9,102 $ 8,810 $ 2,322 At December 31, 2017 , $9 million of the amount of unrecognized tax benefits, if recognized, would affect our effective tax rate. We expect the amount of unrecognized tax benefits to change in the next twelve months; however, we do not expect the change to have a material impact on our financial statements. Our U.S. subsidiaries file a U.S. federal consolidated income tax return. We are currently under examination by various U.S. state and foreign jurisdictions and remain subject to examination until the statute of limitations expires for the respective tax jurisdiction. We are no longer subject to U.S. federal income examination for years before 2014. Foreign and U.S. state jurisdictions have statutes of limitations generally ranging from three to five years. Years still open to examination by foreign tax authorities in major jurisdictions include: the United Kingdom (2015 and forward); Singapore (2013 and forward); Belgium (2016 and forward); and Brazil (2013 and forward).

Other Comprehensive Income (Los

Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2017
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 Loss The balances of, and changes in, the components of accumulated other comprehensive loss, net of tax, consist of the following: (in thousands) Pension Plans Foreign Currency Translation Adjustments Accumulated Other Balance at December 31, 2014 $ (95,119 ) $ (44,041 ) $ (139,160 ) Other comprehensive income (loss) before reclassifications 20,524 (30,687 ) (10,163 ) Amounts reclassified from accumulated other comprehensive loss (a) 4,797 0 4,797 Other comprehensive income (loss) 25,321 (30,687 ) (5,366 ) Balance at December 31, 2015 (69,798 ) (74,728 ) (144,526 ) Other comprehensive income (loss) before reclassifications (8,565 ) (31,595 ) (40,160 ) Amounts reclassified from accumulated other comprehensive loss (a) 2,176 0 2,176 Other comprehensive income (loss) (6,389 ) (31,595 ) (37,984 ) Balance at December 31, 2016 (76,187 ) (106,323 ) (182,510 ) Other comprehensive income (loss) before reclassifications 10,966 23,849 34,815 Amounts reclassified from accumulated other comprehensive loss (a) 1,701 0 1,701 Other comprehensive income (loss) 12,667 23,849 36,516 Balance at December 31, 2017 $ (63,520 ) $ (82,474 ) $ (145,994 ) (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 17 for further information.

Segment and Geographic Area Inf

Segment and Geographic Area Information	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Segment and Geographic Area Information	Segment and Geographic Area Information Segment Information —The tables below show our consolidated segment results. The “All other” category includes the operations of the TEL business, as well as certain contracted manufacturing and services associated with Ethyl. The segment accounting policies are the same as those described in Note 1. We evaluate the performance of the petroleum additives business based on segment operating profit. NewMarket Services departments and other expenses are billed to Afton and Ethyl based on the services provided under the holding company structure. Depreciation on segment property, plant, and equipment, as well as amortization of segment intangible assets, are included in segment operating profit. No transfers occurred between the petroleum additives 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 last three years. Years Ended December 31, (in thousands) 2017 2016 2015 Net sales Petroleum additives Lubricant additives $ 1,790,254 $ 1,672,523 $ 1,740,956 Fuel additives 397,029 362,122 384,039 Total 2,187,283 2,034,645 2,124,995 All other 11,121 14,806 15,835 Net sales (a) $ 2,198,404 $ 2,049,451 $ 2,140,830 Segment operating profit Petroleum additives $ 359,832 $ 384,906 $ 374,934 All other 4,318 530 4,372 Segment operating profit 364,150 385,436 379,306 Corporate, general, and administrative expenses (27,604 ) (21,783 ) (22,779 ) Interest and financing expenses, net (21,856 ) (16,785 ) (14,652 ) Other income (expense), net 752 (3,660 ) (2,904 ) Income before income tax expense $ 315,442 $ 343,208 $ 338,971 (a) No single customer accounted for 10% or more of our total net sales in 2017, 2016, or 2015. The following tables show asset information by segment and the reconciliation to consolidated assets. Segment assets consist of accounts receivable, inventory, and long-lived assets. Long-lived assets included in the petroleum additives segment amounts in the table below include property, plant, and equipment, net of depreciation, as well as intangibles (net of amortization) and goodwill. The additions to long-lived assets include only property, plant, and equipment for each year presented. December 31, (in thousands) 2017 2016 Segment assets Petroleum additives $ 1,461,013 $ 1,083,585 All other 14,089 16,019 1,475,102 1,099,604 Cash and cash equivalents 84,166 192,154 Other accounts receivable 11,026 7,547 Deferred income taxes 4,349 29,063 Prepaid expenses and other current assets 31,074 26,301 Non-segment property, plant, and equipment, net 32,939 29,870 Prepaid pension cost 66,495 25,800 Deferred charges and other assets 7,003 6,097 Total assets $ 1,712,154 $ 1,416,436 Years Ended December 31, (in thousands) 2017 2016 2015 Additions to long-lived assets Petroleum additives $ 196,951 $ 145,768 $ 124,605 All other 0 21 22 Corporate 6,266 1,895 1,872 Total additions to long-lived assets $ 203,217 $ 147,684 $ 126,499 Depreciation and amortization Petroleum additives $ 52,266 $ 42,128 $ 39,365 All other 13 15 12 Corporate 3,061 2,750 2,888 Total depreciation and amortization $ 55,340 $ 44,893 $ 42,265 Geographic Area Information - The tables below report net sales, total assets, and long-lived assets by geographic area, as well as by country for those countries with significant net sales or long-lived assets. Since our foreign operations are significant to our overall business, we are also presenting net sales in the table below by the major regions in which we operate. NewMarket assigns net sales to geographic areas based on the location to which the product was shipped to a third party. Long-lived assets in the table below include property, plant, and equipment, net of depreciation. Years Ended December 31, (in thousands) 2017 2016 2015 Net sales United States $ 696,138 $ 701,209 $ 775,591 China 224,409 203,031 184,175 Europe, Middle East, Africa, India 742,337 653,341 669,198 Asia Pacific, except China 293,137 267,585 252,221 Other foreign 242,383 224,285 259,645 Net sales $ 2,198,404 $ 2,049,451 $ 2,140,830 December 31, (in thousands) 2017 2016 Total assets United States $ 557,488 $ 539,792 Foreign 1,154,666 876,644 Total assets $ 1,712,154 $ 1,416,436 Long-lived assets United States $ 230,049 $ 224,790 Singapore 271,516 189,485 Other foreign 150,716 89,470 Total long-lived assets $ 652,281 $ 503,745

Selected Quarterly Consolidated

Selected Quarterly Consolidated Financial Data (unaudited)	12 Months Ended
	Dec. 31, 2017
Selected Quarterly Financial Information [Abstract]
Selected Quarterly Consolidated Financial Data (unaudited)	Selected Quarterly Consolidated Financial Data (unaudited) (in thousands, except per-share amounts) First Quarter Second Quarter Third Quarter Fourth Quarter 2017 Net sales $ 542,818 $ 547,188 $ 548,416 $ 559,982 Gross profit 170,245 164,876 160,305 146,592 Net income 63,937 62,728 59,772 4,072 Earnings per share - basic and diluted 5.39 5.29 5.04 0.35 2016 First Quarter Second Quarter Third Quarter Fourth Quarter Net sales $ 509,927 $ 521,807 $ 516,090 $ 501,627 Gross profit 175,550 178,400 177,401 149,410 Net income 61,931 64,389 71,449 45,672 Earnings per share - basic and diluted 5.22 5.43 6.03 3.86

Recent Accounting Pronouncement

Recent Accounting Pronouncements	12 Months Ended
	Dec. 31, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606)” (ASU 2014-09). ASU 2014-09 replaces the previous guidance and clarifies the principles for revenue recognition. It requires a five-step process for revenue recognition that represents the transfer of goods or services to customers in an amount that reflects the consideration expected to be received by a company. ASU 2014-09 also requires enhanced disclosures regarding the nature, amount, timing, and uncertainty of revenues and cash flows from contracts with customers. ASU 2014-09 is effective for our reporting period beginning January 1, 2018. Entities can transition to the standard either retrospectively or as a cumulative-effect adjustment as of the date of adoption. We will adopt the standard as a cumulative-effect adjustment. We have substantially completed the evaluation, analysis, and documentation of our adoption of ASU 2014-09 (including those subsequently issued updates that clarify its provisions) and do not believe the adoption will have a material impact on the timing or amount of revenue recognized in our consolidated financial statements, although there will be expanded footnote disclosures. In February 2016, the FASB issued ASU No. 2016-02, "Leases (Topic 842)" (ASU 2016-02). The FASB issued ASU 2016-02 to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and requiring disclosures related to certain information about leasing arrangements. Under the new guidance, operating leases are, in most cases, required to be recognized on the balance sheet as a lease asset and liability. A modified retrospective approach is required for the adoption of ASU 2016-02, which is effective for our reporting period beginning January 1, 2019. Early adoption is permitted. We are currently assessing the impact that the adoption of ASU 2016-02 will have on our consolidated financial statements. In March 2017, the FASB issued ASU No. 2017-07, "Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost" (ASU 2017-07), which requires that an employer report the service cost component of net benefit cost in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the income statement outside of operating profit. ASU 2017-07 also allows only the service cost component to be eligible for capitalization in assets. There will be no change to net income as a result of ASU 2017-07, which is effective for our reporting period beginning January 1, 2018. Retrospective application is required for the income statement presentation and prospective application is required for the capitalization of the service cost component in assets. The adoption of ASU 2017-07 will result in a change within operating profit with a corresponding change in other income (expense), net to reflect the impact of presenting all components of net benefit cost, except for service cost, outside of operating income. See Note 17 for the components of our net benefit costs. We do not expect a material impact to our consolidated financial statements.

Summary of Significant Accoun33

Summary of Significant Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Consolidation	Consolidation —Our consolidated financial statements include the accounts of NewMarket Corporation and its subsidiaries. All intercompany transactions are eliminated upon consolidation. References to "we," "us," "our," the "company," and "NewMarket" are to NewMarket Corporation and its consolidated subsidiaries, unless the context indicates otherwise. NewMarket is the parent company of three operating companies, each managing its own assets and liabilities. Those companies are Afton, which focuses on petroleum additive products; Ethyl, representing certain contracted manufacturing and services, as well as the TEL business; and NewMarket Development, which manages the property and improvements that we own in Virginia. NewMarket is also the parent company of NewMarket Services, which provides various administrative services to NewMarket, Afton, Ethyl, and NewMarket Development. Certain reclassifications have been made to the accompanying consolidated financial statements and the related notes to conform to the current presentation.
Foreign Currency Translation	Foreign Currency Translation —We translate the balance sheets of our foreign subsidiaries into U.S. Dollars based on the current exchange rate at the end of each period. We translate the statements of income using the weighted-average exchange rates for the period. NewMarket includes translation adjustments in the Consolidated Balance Sheets as part of accumulated other comprehensive loss and transaction adjustments in the Consolidated Statements of Income as part of cost of goods sold.
Revenue Recognition	Revenue Recognition —Our policy is to recognize revenue from the sale of products when title and risk of loss have transferred to the buyer, the price is fixed and determinable, and collectability is reasonably assured. Net sales (revenues) are reported at the gross amount billed, including amounts related to shipping that are charged to the customer. Provisions for rebates to customers are recorded in the same period that the related sales are recorded. Freight costs incurred on the delivery of products are included in the Consolidated Statements of Income in cost of goods sold. Our standard terms of delivery are included in our contracts, sales order confirmation documents, and invoices. Taxes assessed by a governmental authority concurrent with sales to our customers, including sales, use, value-added, and revenue-related excise taxes, are not included as net sales, but are reflected in accrued expenses until remitted to the appropriate governmental authority.
Cash and Cash Equivalents	Cash and Cash Equivalents —Our cash equivalents consist of government obligations and commercial paper with original maturities of 90 days or less. Throughout the year, we have cash balances in excess of federally insured amounts on deposit with various financial institutions. We state cash and cash equivalents at cost, which approximates fair value.
Accounts Receivable	Accounts Receivable —We record our accounts receivable at net realizable value. We maintain an allowance for doubtful accounts for estimated losses resulting from our customers not making required payments. We determine the adequacy of the allowance by periodically evaluating each customer’s receivable balance, considering their financial condition and credit history, and considering current economic conditions.
Inventories	Inventories —NewMarket values its petroleum additives and TEL inventories at the lower of cost or net realizable value. In the United States, cost is determined on the last-in, first-out (LIFO) basis. In all other countries, we determine cost using the weighted-average method. Inventory cost includes raw materials, direct labor, and manufacturing overhead.
Property, Plant, and Equipment	Property, Plant, and Equipment —We state property, plant, and equipment at cost and compute depreciation by the straight-line method based on the estimated useful lives of the assets. We capitalize expenditures for significant improvements that extend the useful life of the related property. We expense repairs and maintenance, including plant turnaround costs, as incurred. When property is sold or retired, we remove the cost and accumulated depreciation from the accounts and any related gain or loss is included in earnings.
Intangibles (Net of Amortization) and Goodwill	Intangibles (Net of Amortization) and Goodwill —Identifiable intangibles include the cost of acquired contracts, formulas and technology, trademarks and trade names, and customer bases. We assign a value to identifiable intangibles based on independent third-party appraisals and management's assessment at the time of acquisition. NewMarket amortizes the cost of the customer bases by an accelerated method and the cost of the remaining identifiable intangibles by the straight-line method over the estimated economic life of the intangible. Goodwill arises from the excess of cost over net assets of businesses acquired. Goodwill represents the residual purchase price after allocation to all identifiable net assets. We test goodwill for impairment each year, as well as whenever a significant event or circumstance occurs which could reduce the fair value of the reporting unit to which the goodwill applies below the carrying amount of the reporting unit. We have historically tested goodwill for impairment as of December 31. This year, we voluntarily changed the annual impairment assessment date from December 31 to December 1. We determined this measurement date, which represents a change in the method of applying an accounting principle, to be preferable as it better aligns with our business planning and forecasting process, which is a key component of the annual impairment testing. The change in the measurement date did not delay, accelerate, or prevent an impairment charge.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets —When significant events or circumstances occur that might impair the value of long-lived assets, we evaluate recoverability of the recorded cost of these assets. Assets are considered to be impaired if their carrying amount is not recoverable from the estimated undiscounted future cash flows associated with the assets. If we determine an asset is impaired and its recorded cost is higher than estimated fair market value based on the estimated present value of future cash flows, we adjust the asset to estimated fair market value.
Environmental Costs	Environmental Costs —NewMarket capitalizes environmental compliance costs if they extend the useful life of the related property or prevent future contamination. Environmental compliance costs also include maintenance and operation of pollution prevention and control facilities. We expense these compliance costs in cost of goods sold as incurred. Accrued environmental remediation and monitoring costs relate to an existing condition caused by past operations. NewMarket accrues these costs in current operations within cost of goods sold in the Consolidated Statements of Income when it is probable that we have incurred a liability and the amount can be reasonably estimated. These estimates are based on an assessment of the site, available clean-up methods, and prior experience in handling remediation. When we can reliably determine the amount and timing of future cash flows, we discount these liabilities, incorporating an inflation factor.
Legal Costs	Legal Costs —We expense legal costs in the period incurred.
Employee Savings Plan	Employee Savings Plan —Most of our full-time salaried and hourly employees may participate in defined contribution savings plans. Employees who are covered by collective bargaining agreements may also participate in a savings plan according to the terms of their bargaining agreements. Employees, as well as NewMarket, contribute to the plans.
Research, Development, and Testing Expenses	Research, Development, and Testing Expenses —NewMarket expenses all research, development, and testing costs as incurred. R&D costs include personnel-related costs, as well as internal and external testing of our products.
Income Taxes	Income Taxes —We recognize deferred income taxes for temporary differences between the financial reporting basis and the income tax basis of assets and liabilities. We also adjust for changes in tax rates and laws at the time the changes are enacted. A valuation allowance is recorded when it is more likely than not that a deferred tax asset will not be realized. We recognize accrued interest and penalties associated with uncertain tax positions as part of income tax expense on our Consolidated Statements of Income. We generally provide for additional U.S. taxes that would be incurred if a foreign subsidiary returns its earnings in cash to the United States.
Capital Lease Obligation	Capital Lease Obligation —We record our capital lease obligations at the lower of fair market value of the related asset at the inception of the lease or the present value of the total minimum lease payments.
Derivative Financial Instruments and Hedging Activities	Derivative Financial Instruments and Hedging Activities —We are exposed to certain risks arising from both our business operations and economic conditions. We manage our exposures to a wide variety of business and operational risks through management of our core business activities. We manage certain economic risks, including interest rate, liquidity, and credit risk primarily by managing the amount, sources, and duration of our debt funding, as well as through the use of derivative financial instruments. Specifically, we have entered, and in the future may enter, into interest rate swaps to manage our exposure to interest rate movements. In addition, our foreign operations expose us to fluctuations of foreign exchange rates. These fluctuations may impact our results of operations, financial position, and cash flows. To manage this exposure, we sometimes enter into foreign currency forward contracts to minimize currency exposure due to cash flows from foreign operations. We record all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether we have elected to designate a derivative in a hedging relationship and apply hedge accounting, and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. We may enter into derivative contracts that are intended to economically hedge certain of our risks, even though hedge accounting does not apply or we elect not to apply hedge accounting. We do not enter into derivative instruments for speculative purposes. We had no derivative financial instruments outstanding at December 31, 2017 or December 31, 2016.
Stock-based Compensation	Stock-based Compensation —We calculate the fair value of restricted stock and restricted stock units based on the closing price of our common stock on the date of grant. If award recipients are entitled to receive dividends during the vesting period, we make no adjustment to the fair value of the award for dividends. If the award does not entitle recipients to dividends during the vesting period, we reduce the grant-date price of our common stock by the present value of the dividends expected to be paid on the underlying shares during the vesting period, discounted at the risk-free interest rate. We recognize stock-based compensation expense for the number of awards expected to vest on a straight-line basis over the requisite service period.
Estimates and Risks Due to Concentration of Business	Estimates and Risks Due to Concentration of Business —The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.
Long-term Debt	Long-term debt - We record the carrying amount of our long-term debt at historical cost, less deferred financing costs related to the 4.10% senior notes.

Acquisition of Business (Tables

Acquisition of Business (Tables)	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Schedule of Business Acquisitions, by Acquisition [Table Text Block]	A preliminary allocation of the purchase price is as follows (in millions): Cash $ 1 Trade accounts receivable 16 Inventory 7 Property, plant, and equipment 53 Goodwill 118 Intangible assets 18 Other long-term assets 2 Other current liabilities (8 ) Other long-term liabilities (3 ) Deferred taxes (19 ) Fair value of net assets acquired $ 185
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]	Identified intangible assets acquired consisted of the following: Fair Value (in millions) Estimated Useful Lives (in years) Formulas and technology $ 9 3-6 Customer base 9 4 Total identified intangible assets $ 18

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	The following table illustrates the earnings allocation method utilized in the calculation of basic and diluted earnings per share. Years Ended December 31, (in thousands, except per-share amounts) 2017 2016 2015 Earnings per share numerator: Net income attributable to common shareholders before allocation of earnings to participating securities $ 190,509 $ 243,441 $ 238,603 Earnings allocated to participating securities 356 477 482 Net income attributable to common shareholders after allocation of earnings to participating securities $ 190,153 $ 242,964 $ 238,121 Earnings per share denominator: Weighted-average number of shares of common stock outstanding - basic and diluted 11,824 11,828 12,241 Earnings per share - basic and diluted $ 16.08 $ 20.54 $ 19.45

Supplemental Cash Flow Inform36

Supplemental Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]
Schedule Of Supplemental Cash Flow Information	Years Ended December 31, (in thousands) 2017 2016 2015 Cash paid during the year for Interest and financing expenses (net of capitalization) $ 20,376 $ 18,775 $ 16,193 Income taxes 59,010 60,998 99,006 Supplemental disclosure of non-cash transactions: Release of deposit account funds to terminate interest rate swap $ 0 $ 21,868 $ 0 Non-cash additions to property, plant, and equipment 11,209 8,762 13,959 Non-cash obligation under capital lease 1,341 4,810 0

Trade and Other Accounts Rece37

Trade and Other Accounts Receivable, Net (Tables)	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Schedule of Trade and Other Accounts Receivable, Net	December 31, (in thousands) 2017 2016 Trade receivables $ 310,941 $ 265,991 Income tax receivables 7,455 26,189 Other 16,921 14,736 $ 335,317 $ 306,916

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
Schedule Of Inventories	December 31, (in thousands) 2017 2016 Finished goods and work-in-process $ 319,036 $ 254,068 Raw materials 51,485 45,581 Stores, supplies, and other 12,576 11,863 $ 383,097 $ 311,512

Prepaid Expenses and Other Cu39

Prepaid Expenses and Other Current Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Prepaid Expense and Other Assets, Current [Abstract]
Schedule of Prepaid Expenses and Other Current Assets	December 31, (in thousands) 2017 2016 Dividend funding $ 19,055 $ 17,478 Income taxes on intercompany profit 6,866 3,954 Other 5,153 4,869 $ 31,074 $ 26,301

Property, Plant, and Equipmen40

Property, Plant, and Equipment, at Cost (Tables)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Schedule Of Property, Plant, And Equipment, At Cost	December 31, (in thousands) 2017 2016 Land $ 42,067 $ 40,190 Land improvements 45,144 44,048 Leasehold improvements 1,636 1,510 Buildings 170,624 161,512 Machinery and equipment 1,043,194 915,423 Construction in progress 172,297 102,274 $ 1,474,962 $ 1,264,957
Schedule Of Useful Lives Of Property, Plant, And Equipment	We depreciate the cost of property, plant, and equipment by the straight-line method over the following estimated useful lives: Land improvements 5 - 30 years Buildings 10 - 48 years Machinery and equipment 3 - 20 years

Intangibles (Net of Amortizat41

Intangibles (Net of Amortization) and Goodwill (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule Of 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. December 31, 2017 2016 (in thousands) Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Amortizing intangible assets Formulas and technology $ 12,339 $ 3,280 $ 2,678 $ 1,958 Contract 2,000 200 2,000 0 Customer bases 15,759 5,140 6,938 3,961 Trademarks and trade names 1,531 1,213 1,513 1,069 Goodwill 122,541 4,295 $ 154,170 $ 9,833 $ 17,424 $ 6,988 Aggregate amortization expense $ 2,845 $ 1,860
Schedule Of Estimated Annual Amortization Expense Related To Intangible Assets	Estimated annual amortization expense related to our intangible assets for the next five years is expected to be (in thousands): 2018 $ 7,651 2019 4,660 2020 3,024 2021 2,206 2022 1,473

Deferred Charges and Other As42

Deferred Charges and Other Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Other Assets, Noncurrent [Abstract]
Schedule Of Deferred Charges and Other Assets	December 31, (in thousands) 2017 2016 Asbestos insurance receivables $ 3,767 4,147 Deferred financing costs, net of amortization 2,614 1,414 Other 4,657 4,948 $ 11,038 $ 10,509

Accrued Expenses (Tables)

Accrued Expenses (Tables)	12 Months Ended
	Dec. 31, 2017
Accrued Liabilities, Current [Abstract]
Schedule Of Accrued Expenses	December 31, (in thousands) 2017 2016 Employee benefits, payroll, and related taxes $ 36,252 $ 33,019 Customer rebates 20,703 20,944 Taxes other than income and payroll 5,398 6,046 Capital projects 6,316 18,779 Other 39,330 25,294 $ 107,999 $ 104,082

Long-term Debt (Tables)

Long-term Debt (Tables)	12 Months Ended
	Dec. 31, 2017
Long-term Debt and Capital Lease Obligations [Abstract]
Schedule Of Long-Term Debt	December 31, (in thousands) 2017 2016 Senior notes - 4.10% due 2022 (net of related deferred financing costs) $ 347,091 $ 346,505 Senior notes - 3.78% due 2029 250,000 0 Revolving credit facility 0 156,000 Capital lease obligations 5,809 4,770 $ 602,900 $ 507,275
Schedule of Unused Portion of Revolving Credit Facility	The following table provides information related to the unused portion of our revolving credit facility in effect at December 31, 2017 and December 31, 2016 : December 31, (in thousands) 2017 2016 Maximum borrowing capacity under the revolving credit facility $ 850,000 $ 650,000 Outstanding borrowings under the revolving credit facility 0 156,000 Outstanding letters of credit 2,830 3,483 Unused portion of revolving credit facility $ 847,170 $ 490,517

Other Noncurrent Liabilities (T

Other Noncurrent Liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Other Liabilities, Noncurrent [Abstract]
Schedule Of Other Noncurrent Liabilities	December 31, (in thousands) 2017 2016 Employee benefits $ 89,116 $ 81,377 Deferred income taxes 35,303 9,234 Deemed repatriation of earnings 26,901 0 Environmental remediation 11,753 13,796 Asbestos litigation reserve 8,251 9,710 Other 19,488 17,203 $ 190,812 $ 131,320

Stock-based Compensation (Table

Stock-based Compensation (Tables)	12 Months Ended
	Dec. 31, 2017
Share-based Compensation [Abstract]
Schedule of Restricted Stock and Restricted Stock Unit Activity	A summary of activity during 2017 related to NewMarket’s restricted stock and restricted stock units (stock awards) is presented below in whole shares: Number of Shares Weighted Average Grant-Date Fair Value Unvested stock awards at January 1, 2017 18,114 $ 379.22 Granted in 2017 6,785 428.61 Vested in 2017 6,795 381.99 Forfeited in 2017 467 378.09 Unvested stock awards at December 31, 2017 17,637 397.18

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Estimated Fair Value Of Long-Term Debt	December 31, 2017 December 31, 2016 (in thousands) Carrying Amount Fair Value Carrying Amount Fair Value Long-term debt (excluding capital lease obligation) $ 597,091 $ 623,557 $ 502,505 $ 507,925

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Future Lease Payments For Noncancelable Operating Leases	Future lease payments for all noncancelable operating leases as of December 31, 2017 are (in thousands): 2018 $ 14,520 2019 11,328 2020 8,000 2021 5,169 2022 3,461 After 2022 19,206
Future Payments for Purchase Obligations	Future payments for purchase obligations as of December 31, 2017 are (in thousands): 2018 $ 193,821 2019 197,235 2020 200,115 2021 196,849 2022 185,956 After 2022 113,310

Pension Plans and Other Postr49

Pension Plans and Other Postretirement Benefits (Tables)	12 Months Ended
	Dec. 31, 2017
Retirement Benefits [Abstract]
Schedule of Net Periodic Benefit Cost (Income)	The components of net periodic pension and postretirement benefit cost (income), as well as other amounts recognized in other comprehensive income (loss), are shown below. Years Ended December 31, Pension Benefits Postretirement Benefits (in thousands) 2017 2016 2015 2017 2016 2015 Net periodic benefit cost (income) Service cost $ 13,679 $ 12,860 $ 13,034 $ 774 $ 705 $ 2,244 Interest cost 13,289 13,175 11,938 1,582 1,653 2,548 Expected return on plan assets (26,146 ) (23,137 ) (20,467 ) (1,197 ) (1,239 ) (1,288 ) Amortization of prior service cost (credit) 26 187 99 (3,029 ) (3,028 ) (1,008 ) Amortization of actuarial net (gain) loss 4,725 5,243 6,891 0 0 0 Net periodic benefit cost (income) 5,573 8,328 11,495 (1,870 ) (1,909 ) 2,496 Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss) Actuarial net (gain) loss (13,386 ) 9,140 11,095 2,635 156 (1,826 ) Prior service cost (credit) 0 749 0 0 0 (35,768 ) Amortization of actuarial net gain (loss) (4,725 ) (5,243 ) (6,891 ) 0 0 0 Amortization of prior service (cost) credit (26 ) (187 ) (99 ) 3,029 3,028 1,008 Total recognized in other comprehensive income (loss) (18,137 ) 4,459 4,105 5,664 3,184 (36,586 ) Total recognized in net periodic benefit cost (income) and other comprehensive income (loss) $ (12,564 ) $ 12,787 $ 15,600 $ 3,794 $ 1,275 $ (34,090 ) The components of net periodic pension cost (income), as well as other amounts recognized in other comprehensive income (loss), for these foreign defined benefit pension plans are shown below. Years Ended December 31, (in thousands) 2017 2016 2015 Net periodic benefit cost (income) Service cost $ 7,437 $ 6,926 $ 8,150 Interest cost 4,314 4,915 4,932 Expected return on plan assets (8,479 ) (6,638 ) (7,077 ) Amortization of prior service cost (credit) (79 ) (83 ) (95 ) Amortization of actuarial net (gain) loss 959 1,021 1,587 Net periodic benefit cost (income) 4,152 6,141 7,497 Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss) Actuarial net (gain) loss (3,029 ) 3,215 (5,461 ) Amortization of actuarial net gain (loss) (959 ) (1,021 ) (1,587 ) Amortization of prior service (cost) credit 79 83 95 Total recognized in other comprehensive income (loss) (3,909 ) 2,277 (6,953 ) Total recognized in net periodic benefit cost (income) and other comprehensive income (loss) $ 243 $ 8,418 $ 544
Schedule of Amounts Recognized in Other Comprehensive Income (Loss)	The components of net periodic pension and postretirement benefit cost (income), as well as other amounts recognized in other comprehensive income (loss), are shown below. Years Ended December 31, Pension Benefits Postretirement Benefits (in thousands) 2017 2016 2015 2017 2016 2015 Net periodic benefit cost (income) Service cost $ 13,679 $ 12,860 $ 13,034 $ 774 $ 705 $ 2,244 Interest cost 13,289 13,175 11,938 1,582 1,653 2,548 Expected return on plan assets (26,146 ) (23,137 ) (20,467 ) (1,197 ) (1,239 ) (1,288 ) Amortization of prior service cost (credit) 26 187 99 (3,029 ) (3,028 ) (1,008 ) Amortization of actuarial net (gain) loss 4,725 5,243 6,891 0 0 0 Net periodic benefit cost (income) 5,573 8,328 11,495 (1,870 ) (1,909 ) 2,496 Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss) Actuarial net (gain) loss (13,386 ) 9,140 11,095 2,635 156 (1,826 ) Prior service cost (credit) 0 749 0 0 0 (35,768 ) Amortization of actuarial net gain (loss) (4,725 ) (5,243 ) (6,891 ) 0 0 0 Amortization of prior service (cost) credit (26 ) (187 ) (99 ) 3,029 3,028 1,008 Total recognized in other comprehensive income (loss) (18,137 ) 4,459 4,105 5,664 3,184 (36,586 ) Total recognized in net periodic benefit cost (income) and other comprehensive income (loss) $ (12,564 ) $ 12,787 $ 15,600 $ 3,794 $ 1,275 $ (34,090 ) The components of net periodic pension cost (income), as well as other amounts recognized in other comprehensive income (loss), for these foreign defined benefit pension plans are shown below. Years Ended December 31, (in thousands) 2017 2016 2015 Net periodic benefit cost (income) Service cost $ 7,437 $ 6,926 $ 8,150 Interest cost 4,314 4,915 4,932 Expected return on plan assets (8,479 ) (6,638 ) (7,077 ) Amortization of prior service cost (credit) (79 ) (83 ) (95 ) Amortization of actuarial net (gain) loss 959 1,021 1,587 Net periodic benefit cost (income) 4,152 6,141 7,497 Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss) Actuarial net (gain) loss (3,029 ) 3,215 (5,461 ) Amortization of actuarial net gain (loss) (959 ) (1,021 ) (1,587 ) Amortization of prior service (cost) credit 79 83 95 Total recognized in other comprehensive income (loss) (3,909 ) 2,277 (6,953 ) Total recognized in net periodic benefit cost (income) and other comprehensive income (loss) $ 243 $ 8,418 $ 544
Schedule of Changes in the Plans' Benefit Obligations and Assets	Changes in the benefit obligations and assets of the foreign defined benefit pension plans follow. December 31, (in thousands) 2017 2016 Change in benefit obligation Benefit obligation at beginning of year $ 157,101 $ 146,748 Service cost 7,437 6,926 Interest cost 4,314 4,915 Acquisition 1,888 0 Employee contributions 766 832 Actuarial net (gain) loss 2,417 25,794 Benefits paid (5,157 ) (3,501 ) Foreign currency translation 17,049 (24,613 ) Benefit obligation at end of year 185,815 157,101 Change in plan assets Fair value of plan assets at beginning of year 144,877 138,646 Actual return on plan assets 13,778 29,026 Employer contributions 5,646 5,441 Employee contributions 766 832 Benefits paid (5,157 ) (3,501 ) Acquisition 1,910 0 Foreign currency translation 15,148 (25,567 ) Fair value of plan assets at end of year 176,968 144,877 Funded status $ (8,847 ) $ (12,224 ) Amounts recognized in the Consolidated Balance Sheets Noncurrent assets $ 17,980 $ 10,612 Current liabilities (346 ) (295 ) Noncurrent liabilities (26,481 ) (22,541 ) $ (8,847 ) $ (12,224 ) Amounts recognized in accumulated other comprehensive loss Actuarial net (gain) loss $ 38,831 $ 42,809 Prior service cost (credit) 118 39 Transition obligation 0 10 $ 38,949 $ 42,858 Changes in the plans’ benefit obligations and assets follow. December 31, Pension Benefits Postretirement Benefits (in thousands) 2017 2016 2017 2016 Change in benefit obligation Benefit obligation at beginning of year $ 316,366 $ 292,728 $ 38,110 $ 38,517 Service cost 13,679 12,860 774 705 Interest cost 13,289 13,175 1,582 1,653 Actuarial net (gain) loss 25,828 6,087 2,506 (322 ) Plan amendment 0 748 0 0 Benefits paid (10,350 ) (9,232 ) (2,534 ) (2,443 ) Benefit obligation at end of year 358,812 316,366 40,438 38,110 Change in plan assets Fair value of plan assets at beginning of year 291,092 260,911 23,238 23,972 Actual return on plan assets 65,360 20,083 1,067 761 Employer contributions 19,319 19,330 1,133 948 Benefits paid (10,350 ) (9,232 ) (2,534 ) (2,443 ) Fair value of plan assets at end of year 365,421 291,092 22,904 23,238 Funded status $ 6,609 $ (25,274 ) $ (17,534 ) $ (14,872 ) Amounts recognized in the Consolidated Balance Sheets Noncurrent assets $ 48,515 $ 15,188 $ 0 $ 0 Current liabilities (2,793 ) (2,781 ) (1,278 ) (1,313 ) Noncurrent liabilities (39,113 ) (37,681 ) (16,256 ) (13,559 ) $ 6,609 $ (25,274 ) $ (17,534 ) $ (14,872 ) Amounts recognized in accumulated other comprehensive loss Actuarial net (gain) loss $ 88,950 $ 107,061 $ 1,710 $ (925 ) Prior service cost (credit) 32 58 (28,703 ) (31,732 ) $ 88,982 $ 107,119 $ (26,993 ) $ (32,657 )
Schedule of Amounts Recognized in the Consolidated Balance Sheets	Changes in the benefit obligations and assets of the foreign defined benefit pension plans follow. December 31, (in thousands) 2017 2016 Change in benefit obligation Benefit obligation at beginning of year $ 157,101 $ 146,748 Service cost 7,437 6,926 Interest cost 4,314 4,915 Acquisition 1,888 0 Employee contributions 766 832 Actuarial net (gain) loss 2,417 25,794 Benefits paid (5,157 ) (3,501 ) Foreign currency translation 17,049 (24,613 ) Benefit obligation at end of year 185,815 157,101 Change in plan assets Fair value of plan assets at beginning of year 144,877 138,646 Actual return on plan assets 13,778 29,026 Employer contributions 5,646 5,441 Employee contributions 766 832 Benefits paid (5,157 ) (3,501 ) Acquisition 1,910 0 Foreign currency translation 15,148 (25,567 ) Fair value of plan assets at end of year 176,968 144,877 Funded status $ (8,847 ) $ (12,224 ) Amounts recognized in the Consolidated Balance Sheets Noncurrent assets $ 17,980 $ 10,612 Current liabilities (346 ) (295 ) Noncurrent liabilities (26,481 ) (22,541 ) $ (8,847 ) $ (12,224 ) Amounts recognized in accumulated other comprehensive loss Actuarial net (gain) loss $ 38,831 $ 42,809 Prior service cost (credit) 118 39 Transition obligation 0 10 $ 38,949 $ 42,858 Changes in the plans’ benefit obligations and assets follow. December 31, Pension Benefits Postretirement Benefits (in thousands) 2017 2016 2017 2016 Change in benefit obligation Benefit obligation at beginning of year $ 316,366 $ 292,728 $ 38,110 $ 38,517 Service cost 13,679 12,860 774 705 Interest cost 13,289 13,175 1,582 1,653 Actuarial net (gain) loss 25,828 6,087 2,506 (322 ) Plan amendment 0 748 0 0 Benefits paid (10,350 ) (9,232 ) (2,534 ) (2,443 ) Benefit obligation at end of year 358,812 316,366 40,438 38,110 Change in plan assets Fair value of plan assets at beginning of year 291,092 260,911 23,238 23,972 Actual return on plan assets 65,360 20,083 1,067 761 Employer contributions 19,319 19,330 1,133 948 Benefits paid (10,350 ) (9,232 ) (2,534 ) (2,443 ) Fair value of plan assets at end of year 365,421 291,092 22,904 23,238 Funded status $ 6,609 $ (25,274 ) $ (17,534 ) $ (14,872 ) Amounts recognized in the Consolidated Balance Sheets Noncurrent assets $ 48,515 $ 15,188 $ 0 $ 0 Current liabilities (2,793 ) (2,781 ) (1,278 ) (1,313 ) Noncurrent liabilities (39,113 ) (37,681 ) (16,256 ) (13,559 ) $ 6,609 $ (25,274 ) $ (17,534 ) $ (14,872 ) Amounts recognized in accumulated other comprehensive loss Actuarial net (gain) loss $ 88,950 $ 107,061 $ 1,710 $ (925 ) Prior service cost (credit) 32 58 (28,703 ) (31,732 ) $ 88,982 $ 107,119 $ (26,993 ) $ (32,657 )
Schedule of Plans With the Benefit Obligation in Excess of the Fair Market Value of Plan Assets	The first table below shows information on domestic pension plans with the accumulated benefit obligation in excess of plan assets. The second table presents information on domestic pension plans with the projected benefit obligation in excess of plan assets. December 31, (in thousands) 2017 2016 Plans with the accumulated benefit obligation in excess of the fair market value of plan assets Projected benefit obligation $ 41,906 $ 40,462 Accumulated benefit obligation 38,105 35,939 Fair market value of plan assets 0 0 December 31, (in thousands) 2017 2016 Plans with the projected benefit obligation in excess of the fair market value of plan assets Projected benefit obligation $ 41,906 $ 40,462 Fair market value of plan assets 0 0 The first table below shows information on foreign pension plans with the accumulated benefit obligation in excess of plan assets. The second table shows information on foreign pension plans with the projected benefit obligation in excess of plan assets. December 31, (in thousands) 2017 2016 Plans with the accumulated benefit obligation in excess of the fair market value of plan assets Projected benefit obligation $ 36,687 $ 32,407 Accumulated benefit obligation 23,704 21,310 Fair market value of plan assets 10,151 9,568 December 31, (in thousands) 2017 2016 Plans with the projected benefit obligation in excess of the fair market value of plan assets Projected benefit obligation $ 39,074 $ 32,407 Fair market value of plan assets 12,247 9,568
Schedule of Assumptions to Calculate the Results of Our Retirement Plans	We used the following assumptions to calculate the results of our retirement plans: Pension Benefits Postretirement Benefits 2017 2016 2015 2017 2016 2015 Weighted-average assumptions used to determine net periodic benefit cost (income) for years ended December 31, Discount rate 4.250 % 4.500 % 4.125 % 4.250 % 4.500 % 4.125 % Expected long-term rate of return on plan assets 8.50 % 8.50 % 8.50 % 5.50 % 5.50 % 5.50 % Rate of projected compensation increase 3.50 % 3.50 % 3.50 % Weighted-average assumptions used to determine benefit obligations at December 31, Discount rate 3.750 % 4.250 % 4.500 % 3.750 % 4.250 % 4.500 % Rate of projected compensation increase 3.50 % 3.50 % 3.50 % The information in the table below provides the weighted-average assumptions used to calculate the results of our foreign defined benefit pension plans. 2017 2016 2015 Weighted-average assumptions used to determine net periodic benefit cost (income) for the years ended December 31, Discount rate 2.53 % 3.58 % 3.11 % Expected long-term rate of return on plan assets 5.50 % 5.10 % 5.03 % Rate of projected compensation increase 4.20 % 4.28 % 4.27 % Weighted-average assumptions used to determine benefit obligations at December 31, Discount rate 2.36 % 2.53 % 3.58 % Rate of projected compensation increase 4.14 % 4.20 % 4.28 %
Schedule of Fair Value of Pension and Postretirement Benefit Plans Assets	The following table provides information on the fair value of our pension and postretirement benefit plans assets, as well as the related level within the fair value hierarchy. Investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified by level in the fair value hierarchy. December 31, 2017 December 31, 2016 Fair Value Measurements Using Fair Value Measurements Using (in thousands) Fair Value Level 1 Level 2 Level 3 Fair Value Level 1 Level 2 Level 3 Pension Plans Equity securities: U. S. companies $ 286,103 $ 286,103 $ 0 $ 0 $ 232,895 $ 232,895 $ 0 $ 0 International companies 2,074 2,074 0 0 1,757 1,757 0 0 Real estate investment trusts 3,487 3,487 0 0 2,653 2,653 0 0 Money market instruments 18,395 18,395 0 0 11,120 11,120 0 0 Pooled investment funds: Fixed income securities—mutual funds 8,958 8,958 0 0 8,799 8,799 0 0 International equities—mutual fund 16,715 16,715 0 0 13,104 13,104 0 0 Common collective trusts measured at net asset value 26,084 19,780 Insurance contract 3,605 0 3,605 0 984 0 984 0 $ 365,421 $ 335,732 $ 3,605 $ 0 $ 291,092 $ 270,328 $ 984 $ 0 Postretirement Plans Insurance contract $ 22,904 $ 0 $ 22,904 $ 0 $ 23,238 $ 0 $ 23,238 $ 0 The following table provides information on the fair value of our foreign pension plans assets, as well as the related level within the fair value hierarchy. Investments that are measured at fair value using net asset value per share (or its equivalent) have not been classified by level in the fair value hierarchy. December 31, 2017 December 31, 2016 Fair Value Measurements Using Fair Value Measurements Using (in thousands) Fair Value Level 1 Level 2 Level 3 Fair Value Level 1 Level 2 Level 3 Insurance contract $ 10,151 $ 0 $ 10,151 $ 0 $ 9,399 $ 0 $ 9,399 $ 0 Equity securities—international companies 755 755 0 0 0 0 0 0 Debt securities 872 801 71 0 0 0 0 0 Pooled investment funds—mutual funds 469 469 0 0 169 169 0 0 Cash and cash equivalents 825 825 0 0 427 427 0 0 Pooled investment funds (measured at net asset value): Equity securities—U.S. companies 10,621 9,341 Equity securities—international companies 56,803 64,903 Debt securities 63,007 55,557 Diversified growth funds 33,465 0 Cash and cash equivalents 0 349 Property 0 4,732 $ 176,968 $ 2,850 $ 10,222 $ 0 $ 144,877 $ 596 $ 9,399 $ 0
Schedule of Expected Benefit Payments	The expected benefit payments for the next ten years for our foreign pension plans are shown in the table below. (in thousands) Expected Pension Benefit Payments 2018 $ 4,061 2019 4,087 2020 4,540 2021 4,637 2022 3,773 2023 through 2027 28,938 The expected benefit payments for the next ten years are as follows. (in thousands) Expected Pension Benefit Payments Expected Postretirement Benefit Payments 2018 $ 11,404 $ 2,815 2019 12,426 2,659 2020 13,227 2,511 2021 14,256 2,391 2022 15,154 2,278 2023 through 2027 92,183 10,277

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Schedule of Income Before Income Tax Expense	Our income before income tax expense, as well as our provision for income taxes is shown in the table below. Years Ended December 31, (in thousands) 2017 2016 2015 Income before income tax expense Domestic $ 140,779 $ 161,687 $ 229,561 Foreign 174,663 181,521 109,410 $ 315,442 $ 343,208 $ 338,971 Income tax expense Current income taxes Federal $ 61,188 $ 34,213 $ 62,491 State 3,942 9,020 11,216 Foreign 32,428 37,349 26,511 97,558 80,582 100,218 Deferred income taxes Federal 15,901 13,876 1,287 State 3,633 3,095 (936 ) Foreign 7,841 2,214 (201 ) 27,375 19,185 150 Total income tax expense $ 124,933 $ 99,767 $ 100,368
Schedule of Provision for Income Taxes	Our income before income tax expense, as well as our provision for income taxes is shown in the table below. Years Ended December 31, (in thousands) 2017 2016 2015 Income before income tax expense Domestic $ 140,779 $ 161,687 $ 229,561 Foreign 174,663 181,521 109,410 $ 315,442 $ 343,208 $ 338,971 Income tax expense Current income taxes Federal $ 61,188 $ 34,213 $ 62,491 State 3,942 9,020 11,216 Foreign 32,428 37,349 26,511 97,558 80,582 100,218 Deferred income taxes Federal 15,901 13,876 1,287 State 3,633 3,095 (936 ) Foreign 7,841 2,214 (201 ) 27,375 19,185 150 Total income tax expense $ 124,933 $ 99,767 $ 100,368
Reconciliation Of U.S. Federal Statutory Rate To Effective Income Tax Rate	The reconciliation of the U.S. federal statutory rate to the effective income tax rate follows: % of Income Before Income Tax Expense 2017 2016 2015 Federal statutory rate 35.0 % 35.0 % 35.0 % State taxes, net of federal tax 1.6 2.3 2.0 Foreign operations (4.4 ) (5.8 ) (4.3 ) Domestic research tax credit (1.1 ) (1.2 ) (1.2 ) Domestic manufacturing tax benefit (0.8 ) (0.8 ) (1.9 ) Deemed repatriation of foreign earnings 10.1 0.0 0.0 Other items and adjustments (0.8 ) (0.4 ) 0.0 Effective income tax rate 39.6 % 29.1 % 29.6 %
Schedule of Deferred Income Tax Assets and Liabilities	Our deferred income tax assets and liabilities follow. December 31, (in thousands) 2017 2016 Deferred income tax assets Future employee benefits $ 8,039 $ 30,178 Environmental and future shutdown reserves 3,327 5,737 Operating loss and credit carryforwards 6,312 2,935 Trademark expenses 3,852 5,810 Foreign currency translation adjustments 3,993 6,687 Other 3,248 7,458 Gross deferred income tax assets 28,771 58,805 Valuation allowance (5,768 ) (2,935 ) Total deferred income tax assets 23,003 55,870 Deferred income tax liabilities Depreciation and amortization 45,128 29,736 Other 8,829 6,305 Total deferred tax liabilities 53,957 36,041 Net deferred income tax (liabilities) assets $ (30,954 ) $ 19,829 Reconciliation to financial statements Deferred income tax assets $ 4,349 $ 29,063 Deferred income tax liabilities 35,303 9,234 Net deferred income tax (liabilities) assets $ (30,954 ) $ 19,829
Schedule of Reconciliation Of Unrecognized Tax Benefits	A reconciliation of the beginning and ending balances of the unrecognized tax benefits from uncertain positions is as follows: December 31, (in thousands) 2017 2016 2015 Balance at beginning of year $ 8,810 $ 2,322 $ 1,465 Increases for tax positions of prior years 865 773 1,035 Decreases for tax positions of prior years 0 0 0 Increases for tax positions of the current year 453 5,826 533 Settlements (260 ) (111 ) (497 ) Lapses of statutes (766 ) 0 (214 ) Balance at end of year $ 9,102 $ 8,810 $ 2,322

Other Comprehensive Income (L51

Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2017
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 loss, net of tax, consist of the following: (in thousands) Pension Plans Foreign Currency Translation Adjustments Accumulated Other Balance at December 31, 2014 $ (95,119 ) $ (44,041 ) $ (139,160 ) Other comprehensive income (loss) before reclassifications 20,524 (30,687 ) (10,163 ) Amounts reclassified from accumulated other comprehensive loss (a) 4,797 0 4,797 Other comprehensive income (loss) 25,321 (30,687 ) (5,366 ) Balance at December 31, 2015 (69,798 ) (74,728 ) (144,526 ) Other comprehensive income (loss) before reclassifications (8,565 ) (31,595 ) (40,160 ) Amounts reclassified from accumulated other comprehensive loss (a) 2,176 0 2,176 Other comprehensive income (loss) (6,389 ) (31,595 ) (37,984 ) Balance at December 31, 2016 (76,187 ) (106,323 ) (182,510 ) Other comprehensive income (loss) before reclassifications 10,966 23,849 34,815 Amounts reclassified from accumulated other comprehensive loss (a) 1,701 0 1,701 Other comprehensive income (loss) 12,667 23,849 36,516 Balance at December 31, 2017 $ (63,520 ) $ (82,474 ) $ (145,994 ) (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 17 for further information.

Segment and Geographic Area I52

Segment and Geographic Area Information (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Schedule of 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 last three years. Years Ended December 31, (in thousands) 2017 2016 2015 Net sales Petroleum additives Lubricant additives $ 1,790,254 $ 1,672,523 $ 1,740,956 Fuel additives 397,029 362,122 384,039 Total 2,187,283 2,034,645 2,124,995 All other 11,121 14,806 15,835 Net sales (a) $ 2,198,404 $ 2,049,451 $ 2,140,830 Segment operating profit Petroleum additives $ 359,832 $ 384,906 $ 374,934 All other 4,318 530 4,372 Segment operating profit 364,150 385,436 379,306 Corporate, general, and administrative expenses (27,604 ) (21,783 ) (22,779 ) Interest and financing expenses, net (21,856 ) (16,785 ) (14,652 ) Other income (expense), net 752 (3,660 ) (2,904 ) Income before income tax expense $ 315,442 $ 343,208 $ 338,971 (a) No single customer accounted for 10% or more of our total net sales in 2017, 2016, or 2015.
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 last three years. Years Ended December 31, (in thousands) 2017 2016 2015 Net sales Petroleum additives Lubricant additives $ 1,790,254 $ 1,672,523 $ 1,740,956 Fuel additives 397,029 362,122 384,039 Total 2,187,283 2,034,645 2,124,995 All other 11,121 14,806 15,835 Net sales (a) $ 2,198,404 $ 2,049,451 $ 2,140,830 Segment operating profit Petroleum additives $ 359,832 $ 384,906 $ 374,934 All other 4,318 530 4,372 Segment operating profit 364,150 385,436 379,306 Corporate, general, and administrative expenses (27,604 ) (21,783 ) (22,779 ) Interest and financing expenses, net (21,856 ) (16,785 ) (14,652 ) Other income (expense), net 752 (3,660 ) (2,904 ) Income before income tax expense $ 315,442 $ 343,208 $ 338,971 (a) No single customer accounted for 10% or more of our total net sales in 2017, 2016, or 2015.
Schedule Of Asset Information By Segment	The following tables show asset information by segment and the reconciliation to consolidated assets. Segment assets consist of accounts receivable, inventory, and long-lived assets. Long-lived assets included in the petroleum additives segment amounts in the table below include property, plant, and equipment, net of depreciation, as well as intangibles (net of amortization) and goodwill. The additions to long-lived assets include only property, plant, and equipment for each year presented. December 31, (in thousands) 2017 2016 Segment assets Petroleum additives $ 1,461,013 $ 1,083,585 All other 14,089 16,019 1,475,102 1,099,604 Cash and cash equivalents 84,166 192,154 Other accounts receivable 11,026 7,547 Deferred income taxes 4,349 29,063 Prepaid expenses and other current assets 31,074 26,301 Non-segment property, plant, and equipment, net 32,939 29,870 Prepaid pension cost 66,495 25,800 Deferred charges and other assets 7,003 6,097 Total assets $ 1,712,154 $ 1,416,436
Additions To Long-lived Assets And Depreciation And Amortization By Segment	Years Ended December 31, (in thousands) 2017 2016 2015 Additions to long-lived assets Petroleum additives $ 196,951 $ 145,768 $ 124,605 All other 0 21 22 Corporate 6,266 1,895 1,872 Total additions to long-lived assets $ 203,217 $ 147,684 $ 126,499 Depreciation and amortization Petroleum additives $ 52,266 $ 42,128 $ 39,365 All other 13 15 12 Corporate 3,061 2,750 2,888 Total depreciation and amortization $ 55,340 $ 44,893 $ 42,265
Schedule Of Net Sales, Total Assets, And Long-Lived Assets By Geographic Area	The tables below report net sales, total assets, and long-lived assets by geographic area, as well as by country for those countries with significant net sales or long-lived assets. Since our foreign operations are significant to our overall business, we are also presenting net sales in the table below by the major regions in which we operate. NewMarket assigns net sales to geographic areas based on the location to which the product was shipped to a third party. Long-lived assets in the table below include property, plant, and equipment, net of depreciation. Years Ended December 31, (in thousands) 2017 2016 2015 Net sales United States $ 696,138 $ 701,209 $ 775,591 China 224,409 203,031 184,175 Europe, Middle East, Africa, India 742,337 653,341 669,198 Asia Pacific, except China 293,137 267,585 252,221 Other foreign 242,383 224,285 259,645 Net sales $ 2,198,404 $ 2,049,451 $ 2,140,830 December 31, (in thousands) 2017 2016 Total assets United States $ 557,488 $ 539,792 Foreign 1,154,666 876,644 Total assets $ 1,712,154 $ 1,416,436 Long-lived assets United States $ 230,049 $ 224,790 Singapore 271,516 189,485 Other foreign 150,716 89,470 Total long-lived assets $ 652,281 $ 503,745

Selected Quarterly Consolidat53

Selected Quarterly Consolidated Financial Data (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2017
Selected Quarterly Financial Information [Abstract]
Schedule Of Selected Quarterly Consolidated Financial Data (unaudited)	(in thousands, except per-share amounts) First Quarter Second Quarter Third Quarter Fourth Quarter 2017 Net sales $ 542,818 $ 547,188 $ 548,416 $ 559,982 Gross profit 170,245 164,876 160,305 146,592 Net income 63,937 62,728 59,772 4,072 Earnings per share - basic and diluted 5.39 5.29 5.04 0.35 2016 First Quarter Second Quarter Third Quarter Fourth Quarter Net sales $ 509,927 $ 521,807 $ 516,090 $ 501,627 Gross profit 175,550 178,400 177,401 149,410 Net income 61,931 64,389 71,449 45,672 Earnings per share - basic and diluted 5.22 5.43 6.03 3.86

Summary of Significant Accoun54

Summary of Significant Accounting Policies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)company	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of operating companies under parent company | company	3
Foreign currency transaction adjustments	$ 5,000	$ 5,000	$ (11,000)
Contributions by employer for employee savings plans	6,000	7,000	6,000
Undistributed earnings of foreign subsidiaries	0	537,000	436,000
Derivative Liability, Notional Amount		$ 97,000
Derivative, Fixed Interest Rate		5.3075%
Release of deposit account funds to terminate interest rate swap	$ 0	$ 21,868	$ 0
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents maturity, days	90 days

Acquisition of Business (Narrat

Acquisition of Business (Narrative) (Details) $ in Millions	Jul. 03, 2017USD ($)
Business Acquisition [Line Items]
Percentage of Business Acquired	99.50%
Cash Payment for Acquisition	$ 185
Goodwill	118
MEXICO
Business Acquisition [Line Items]
Goodwill Deductible for Tax Purposes	$ 0

Acquisition of Business (Schedu

Acquisition of Business (Schedule of Business Acquisition, By Acquisition) (Details) $ in Millions	Jul. 03, 2017USD ($)
Business Acquisition [Line Items]
Cash	$ 1
Trade accounts receivable	16
Inventory	7
Property, plant, and equipment	53
Goodwill	118
Intangible assets	18
Other long-term assets	2
Other current liabilities	(8)
Other long-term liabilities	(3)
Deferred taxes	(19)
Fair value of net assets acquired	$ 185

Acquisition of Business (Sche57

Acquisition of Business (Schedule Of Finite Lived Intangible Assets Acquired As Part Of Business Combination (Details) - USD ($) $ in Millions	Jul. 03, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Intangible assets	$ 18
Formulas and Technology [Member]
Business Acquisition [Line Items]
Intangible assets	9
Customer Bases [Member]
Business Acquisition [Line Items]
Intangible assets	$ 9
Estimated economic life, in years	4 years
Minimum [Member] | Formulas and Technology [Member]
Business Acquisition [Line Items]
Estimated economic life, in years	3 years	3 years
Minimum [Member] | Customer Bases [Member]
Business Acquisition [Line Items]
Estimated economic life, in years		4 years
Maximum [Member] | Formulas and Technology [Member]
Business Acquisition [Line Items]
Estimated economic life, in years	6 years	10 years
Maximum [Member] | Customer Bases [Member]
Business Acquisition [Line Items]
Estimated economic life, in years		20 years

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Anti-dilutive shares that were excluded from the calculation of diluted earnings per share (in shares)									16,708	17,130	26,450
Earnings per share numerator:
Net income attributable to common shareholders before allocation of earnings to participating securities	$ 4,072	$ 59,772	$ 62,728	$ 63,937	$ 45,672	$ 71,449	$ 64,389	$ 61,931	$ 190,509	$ 243,441	$ 238,603
Earnings allocated to participating securities									356	477	482
Net income attributable to common shareholders after allocation of earnings to participating securities									$ 190,153	$ 242,964	$ 238,121
Earnings per share denominator:
Weighted-average number of shares of common stock outstanding - basic and diluted (in shares)									11,824,000	11,828,000	12,241,000
Earnings per share - basic and diluted (in dollars per share)	$ 0.35	$ 5.04	$ 5.29	$ 5.39	$ 3.86	$ 6.03	$ 5.43	$ 5.22	$ 16.08	$ 20.54	$ 19.45

Supplemental Cash Flow Inform59

Supplemental Cash Flow Information (Schedule Of Cash Flow Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash paid during the year for
Interest and financing expenses (net of capitalization)	$ 20,376	$ 18,775	$ 16,193
Income taxes	59,010	60,998	99,006
Supplemental disclosure of non-cash transactions
Release of deposit account funds to terminate interest rate swap	0	21,868	0
Non-cash additions to property, plant, and equipment	11,209	8,762	13,959
Non-cash obligation under capital lease	$ 1,341	$ 4,810	$ 0

Trade and Other Accounts Rece60

Trade and Other Accounts Receivable, Net (Schedule Of Trade And Other Accounts Receivable, Net) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Receivables [Abstract]
Trade receivables	$ 310,941	$ 265,991
Income tax receivables	7,455	26,189
Other	16,921	14,736
Trade and other accounts receivable, net	$ 335,317	$ 306,916

Inventories (Narrative) (Detail

Inventories (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Inventory [Line Items]
U.S. inventories, LIFO basis	$ 128,000	$ 130,000
LIFO inventories amount below replacement cost	49,000	39,000
Inventories	383,097	311,512
International companies
Inventory [Line Items]
Inventories	$ 244,000	$ 176,000

Inventories (Schedule Of Invent

Inventories (Schedule Of Inventories) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Finished goods and work-in-process	$ 319,036	$ 254,068
Raw materials	51,485	45,581
Stores, supplies, and other	12,576	11,863
Inventories	$ 383,097	$ 311,512

Prepaid Expenses and Other Cu63

Prepaid Expenses and Other Current Assets (Schedule Of Prepaid Expenses And Other Current Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Prepaid Expense and Other Assets, Current [Abstract]
Dividend funding	$ 19,055	$ 17,478
Income taxes on intercompany profit	6,866	3,954
Other	5,153	4,869
Prepaid expenses and other current assets	$ 31,074	$ 26,301

Property, Plant, and Equipmen64

Property, Plant, and Equipment, at Cost (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 51	$ 42	$ 35

Property, Plant, and Equipmen65

Property, Plant, and Equipment, at Cost (Schedule Of Property, Plant, And Equipment, At Cost) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Land	$ 42,067	$ 40,190
Land improvements	45,144	44,048
Leasehold improvements	1,636	1,510
Buildings	170,624	161,512
Machinery and equipment	1,043,194	915,423
Construction in progress	172,297	102,274
Property, plant, and equipment, at cost	$ 1,474,962	$ 1,264,957

Property, Plant, and Equipmen66

Property, Plant, and Equipment, at Cost (Schedule Of Useful Lives Of Property, Plant, And Equipment) (Details)	12 Months Ended
	Dec. 31, 2017
Minimum [Member] | Land Improvements [Member]
Property, Plant and Equipment, at Cost [Line Items]
Property, plant, and equipment, useful lives (in years)	5 years
Minimum [Member] | Buildings [Member]
Property, Plant and Equipment, at Cost [Line Items]
Property, plant, and equipment, useful lives (in years)	10 years
Minimum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment, at Cost [Line Items]
Property, plant, and equipment, useful lives (in years)	3 years
Maximum [Member] | Land Improvements [Member]
Property, Plant and Equipment, at Cost [Line Items]
Property, plant, and equipment, useful lives (in years)	30 years
Maximum [Member] | Buildings [Member]
Property, Plant and Equipment, at Cost [Line Items]
Property, plant, and equipment, useful lives (in years)	48 years
Maximum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment, at Cost [Line Items]
Property, plant, and equipment, useful lives (in years)	20 years

Intangibles (Net of Amortizat67

Intangibles (Net of Amortization) and Goodwill (Narrative) (Details) - USD ($)	Jul. 03, 2017	Dec. 31, 2017	Dec. 31, 2016
Intangibles (net of amortization) and Goodwill [Line Items]
Accumulated Goodwill Impairment		$ 0	$ 0
Intangibles (net of amortization) and goodwill		$ 144,337,000	$ 10,436,000
Contracts [Member]
Intangibles (net of amortization) and Goodwill [Line Items]
Estimated economic life, in years		10 years
Customer Bases [Member]
Intangibles (net of amortization) and Goodwill [Line Items]
Estimated economic life, in years	4 years
Customer Bases [Member] | Minimum [Member]
Intangibles (net of amortization) and Goodwill [Line Items]
Estimated economic life, in years		4 years
Customer Bases [Member] | Maximum [Member]
Intangibles (net of amortization) and Goodwill [Line Items]
Estimated economic life, in years		20 years
Formulas and Technology [Member] | Minimum [Member]
Intangibles (net of amortization) and Goodwill [Line Items]
Estimated economic life, in years	3 years	3 years
Formulas and Technology [Member] | Maximum [Member]
Intangibles (net of amortization) and Goodwill [Line Items]
Estimated economic life, in years	6 years	10 years
Trademarks and Trade Names [Member]
Intangibles (net of amortization) and Goodwill [Line Items]
Estimated economic life, in years		10 years

Intangibles (Net of Amortizat68

Intangibles (Net of Amortization) and Goodwill (Schedule Of Information Related To Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Intangibles (net of amortization) and Goodwill [Line Items]
Amortizing intangible assets, Accumulated Amortization	$ 9,833	$ 6,988
Goodwill, Gross Carrying Amount	122,541	4,295
Amortizing intangible assets and Goodwill, Gross Carrying Amount	154,170	17,424
Aggregate amortization expense	2,845	1,860	$ 6,000
Formulas and Technology [Member]
Intangibles (net of amortization) and Goodwill [Line Items]
Amortizing intangible assets, Gross Carrying Amount	12,339	2,678
Amortizing intangible assets, Accumulated Amortization	3,280	1,958
Contracts [Member]
Intangibles (net of amortization) and Goodwill [Line Items]
Amortizing intangible assets, Gross Carrying Amount	2,000	2,000
Amortizing intangible assets, Accumulated Amortization	200	0
Customer Bases [Member]
Intangibles (net of amortization) and Goodwill [Line Items]
Amortizing intangible assets, Gross Carrying Amount	15,759	6,938
Amortizing intangible assets, Accumulated Amortization	5,140	3,961
Trademarks and Trade Names [Member]
Intangibles (net of amortization) and Goodwill [Line Items]
Amortizing intangible assets, Gross Carrying Amount	1,531	1,513
Amortizing intangible assets, Accumulated Amortization	$ 1,213	$ 1,069

Intangibles (Net of Amortizat69

Intangibles (Net of Amortization) and Goodwill (Schedule Of Estimated Annual Amortization Expense Related To Intangible Assets) (Details) $ in Thousands	Dec. 31, 2017USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,018	$ 7,651
2,019	4,660
2,020	3,024
2,021	2,206
2,022	$ 1,473

Deferred Charges and Other As70

Deferred Charges and Other Assets (Schedule Of Deferred Charges And Other Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred Charges and Other Assets [Line Items]
Asbestos insurance receivables	$ 3,767	$ 4,147
Deferred financing costs, net of amortization	2,614	1,414
Other	4,657	4,948
Deferred charges and other assets	$ 11,038	$ 10,509
4.10% Senior Notes [Member]
Deferred Charges and Other Assets [Line Items]
Senior notes, interest rate	4.10%	4.10%

Accrued Expenses (Schedule Of A

Accrued Expenses (Schedule Of Accrued Expenses) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accrued Liabilities, Current [Abstract]
Employee benefits, payroll, and related taxes	$ 36,252	$ 33,019
Customer rebates	20,703	20,944
Taxes other than income and payroll	5,398	6,046
Capital projects	6,316	18,779
Other	39,330	25,294
Accrued expenses	$ 107,999	$ 104,082

Long-term Debt (Narrative) (Det

Long-term Debt (Narrative) (Details)	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2012USD ($)	Dec. 20, 2012
Debt Instrument [Line Items]
Outstanding borrowings	$ 602,900,000	$ 507,275,000
4.10% Senior Notes [Member]
Debt Instrument [Line Items]
Outstanding borrowings	$ 347,091,000	$ 346,505,000
Senior notes, interest rate	4.10%	4.10%
Debt instrument, maturity date	2,022	2,022
Principal amount of debt issued	$ 350,000,000
4.10% senior notes issue price				99.83%
Financing costs incurred			$ 5,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Outstanding borrowings	0	$ 156,000,000
Financing costs incurred	$ 2,800,000
Term of credit facility	5 years
Maximum borrowing capacity	$ 850,000,000	$ 650,000,000
Increase in aggregate amount of revolving credit facility allowed	425,000,000
Payments of Financing Costs	1,900,000
Line Of Credit Facility Financing Costs Carried Over	900,000
Deferred financing costs written off	$ 200,000
Revolving credit facility, maturity date	Sep. 22, 2022
Basis spread on NYFRB rate	0.50%
Basis spread on adjusted LIBO rate	1.00%
Maximum Consolidated Leverage Ratio	3.50
Minimum Consolidated Interest Coverage Ratio	3
Average interest rate during period	2.50%	1.90%
Average interest rate at period end		2.10%
Revolving Credit Facility [Member] | Letters of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 75,000,000
Revolving Credit Facility [Member] | Multicurrency Borrowings [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	150,000,000
Revolving Credit Facility [Member] | Swingline Loans [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 20,000,000
Revolving Credit Facility [Member] | Loans Bearing Interest Based On ABR [Member]
Debt Instrument [Line Items]
Applicable Rate	0.125%
Revolving Credit Facility [Member] | Loans Bearing Interest Based On ABR [Member] | Minimum [Member]
Debt Instrument [Line Items]
Applicable Rate	0.00%
Revolving Credit Facility [Member] | Loans Bearing Interest Based On ABR [Member] | Maximum [Member]
Debt Instrument [Line Items]
Applicable Rate	0.625%
Revolving Credit Facility [Member] | Loans Bearing Interest Based On Adjusted LIBO Rate [Member]
Debt Instrument [Line Items]
Applicable Rate	1.125%
Revolving Credit Facility [Member] | Loans Bearing Interest Based On Adjusted LIBO Rate [Member] | Minimum [Member]
Debt Instrument [Line Items]
Applicable Rate	1.00%
Revolving Credit Facility [Member] | Loans Bearing Interest Based On Adjusted LIBO Rate [Member] | Maximum [Member]
Debt Instrument [Line Items]
Applicable Rate	1.625%
3.78% Senior Notes [Member]
Debt Instrument [Line Items]
Outstanding borrowings	$ 250,000,000	$ 0
Senior notes, interest rate	3.78%
Debt Instrument, Maturity Date	Jan. 4, 2029
Annual principal payments beginning January 4, 2025	$ 50,000,000
Principal amount of debt issued	$ 250,000,000

Long-term Debt (Schedule Of Lon

Long-term Debt (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Outstanding borrowings	$ 602,900	$ 507,275
4.10% Senior Notes [Member]
Debt Instrument [Line Items]
Outstanding borrowings	$ 347,091	$ 346,505
Senior notes, interest rate	4.10%	4.10%
Debt instrument, maturity date	2,022	2,022
3.78% Senior Notes [Member]
Debt Instrument [Line Items]
Outstanding borrowings	$ 250,000	$ 0
Senior notes, interest rate	3.78%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Outstanding borrowings	$ 0	156,000
Capital Lease Obligation [Member]
Debt Instrument [Line Items]
Outstanding borrowings	$ 5,809	$ 4,770

Long-term Debt (Schedule Of Unu

Long-term Debt (Schedule Of Unused Portion Of Revolving Credit Facility) (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Outstanding borrowings	$ 602,900,000	$ 507,275,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity under the revolving credit facility	850,000,000	650,000,000
Outstanding borrowings	0	156,000,000
Outstanding letters of credit	2,830,000	3,483,000
Unused portion of revolving credit facility	$ 847,170,000	$ 490,517,000

Other Noncurrent Liabilities (S

Other Noncurrent Liabilities (Schedule Of Other Noncurrent Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Liabilities, Noncurrent [Abstract]
Employee benefits	$ 89,116	$ 81,377
Deferred income taxes	35,303	9,234
Deemed repatriation of earnings	26,901	0
Environmental remediation	11,753	13,796
Asbestos litigation reserve	8,251	9,710
Other	19,488	17,203
Other noncurrent liabilities	$ 190,812	$ 131,320

Stock-based Compensation (Narra

Stock-based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)director$ / sharesshares	Dec. 31, 2016USD ($)shares	Dec. 31, 2015USD ($)$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive stock option, exercise period, maximum, in years	10 years
Maximum number of shares, options, SARs, or stock units granted or awarded in calendar year per participant	200,000
Maximum aggregate number of shares of common stock that may be issued under the Plan	1,000,000
Shares available for grant (in shares)	974,044
Restricted Stock And Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards granted (in shares)	6,785	0
Stock awards weighted average grant date fair value (in dollars per share) | $ / shares	$ 428.61		$ 375.57
Fair value of shares vested | $	$ 3	$ 3	$ 4
Compensation expense | $	3	$ 3	$ 2
Unrecognized compensation expense | $	$ 3
Period for recognition of unrecognized compensation expense, in years	1 year 6 months
Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards granted (in shares)	650
Number of non-employee directors | director	5

Stock-based Compensation (Sched

Stock-based Compensation (Schedule of Restricted Stock And Restricted Stock Unit Activity) (Details) - Restricted Stock And Restricted Stock Units [Member] - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Number of Shares
Stock awards at beginning of year (in shares)	18,114
Granted in 2017 (in shares)	6,785	0
Vested in 2017 (in shares)	6,795
Forfeited in 2017 (in shares)	467
Stock awards at end of year (in shares)	17,637	18,114
Weighted Average Grant-Date Fair Value
Sock awards at beginning of year (in dollars per share)	$ 379.22
Granted in 2017 (in dollars per share)	428.61		$ 375.57
Vested in 2017 (in dollars per share)	381.99
Forfeited in 2017 (in dollars per share)	378.09
Stock awards at end of year (in dollars per share)	$ 397.18	$ 379.22

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value Measurements [Line Items]
Cash and cash equivalents, Carrying Amount in Consolidated Balance Sheets	$ 84,166	$ 192,154	$ 93,424	$ 103,003
Carrying Amount in Consolidated Balance Sheets [Member]
Fair Value Measurements [Line Items]
Cash and cash equivalents, Carrying Amount in Consolidated Balance Sheets	84,166	192,154
Level 1 | Fair Value
Fair Value Measurements [Line Items]
Cash and cash equivalents, Fair Value	$ 84,166	$ 192,154

Fair Value Measurements (Estima

Fair Value Measurements (Estimated Fair Value Of Long-Term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt, Carrying Amount	$ 597,091	$ 502,505
4.10% Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes, interest rate	4.10%	4.10%
Level 2
Debt Instrument [Line Items]
Long-term debt, Fair Value	$ 623,557	$ 507,925

Commitments and Contingencies80

Commitments and Contingencies (Contractual Commitments and Purchase Obligations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Contractual Commitments [Abstract]
Operating lease rental expense	$ 33,000	$ 33,000	$ 34,000
2,018	14,520
2,019	11,328
2,020	8,000
2,021	5,169
2,022	3,461
After 2,022	19,206
Inventories [Member]
Purchase Obligations [Abstract]
2,018	193,821
2,019	197,235
2,020	200,115
2,021	196,849
2,022	185,956
After 2,022	113,310
Construction of Assets and Purchases of Property and Equipment [Member]
Contractual Commitments [Abstract]
Contractual purchase obligations	$ 26,000
Period of obligations for construction of assets and purchases of property and equipment	5 years

Commitments and Contingencies81

Commitments and Contingencies (Litigation) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Asbestos Litigation Reserve	$ 10	$ 11
Insurance Settlements Receivable	$ 5	$ 5

Commitments and Contingencies82

Commitments and Contingencies (Environmental) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Site Contingency [Line Items]
Accruals for environmental remediation, dismantling, and decontamination	$ 14	$ 16
Former TEL Plant Site Louisiana and Houston, Texas Plant Site [Member]
Site Contingency [Line Items]
Accruals for environmental remediation, dismantling, and decontamination	7	10
Accrual for environmental remediation, dismantling, and decontamination, undiscounted	10	13
Former TEL Plant Site Louisiana [Member]
Site Contingency [Line Items]
Accrual for remediation of groundwater and soil	3	4
Houston, Texas Plant Site [Member]
Site Contingency [Line Items]
Accrual for remediation of groundwater and soil	$ 4	$ 5
Minimum [Member] | Former TEL Plant Site Louisiana and Houston, Texas Plant Site [Member]
Site Contingency [Line Items]
Discount rate	4.00%	4.00%
Maximum [Member] | Former TEL Plant Site Louisiana and Houston, Texas Plant Site [Member]
Site Contingency [Line Items]
Discount rate	9.00%	9.00%

Pension Plans and Other Postr83

Pension Plans and Other Postretirement Benefits (Narrative) (Details) $ in Millions	Jan. 01, 2018	Dec. 31, 2017USD ($)plansinvestmentmanagers	Dec. 31, 2017USD ($)plansinvestmentmanagers	Dec. 31, 2016USD ($)	Dec. 31, 2015
Pension Benefits | CANADA | Pooled investment funds
Defined Benefit Plan Disclosure [Line Items]
Unfunded commitments - pooled investment funds		$ 0	$ 0
Pension Benefits | UNITED KINGDOM | Pooled investment funds
Defined Benefit Plan Disclosure [Line Items]
Unfunded commitments - pooled investment funds		$ 0	$ 0
Pension Benefits | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Number of pension plans | plans		4	4
Actuarial net loss to be amortized from accumulated other comprehensive loss into net periodic benefit cost (income) in next fiscal year		$ (5)	$ (5)
Accumulated benefit obligation		$ 307	$ 307	$ 272
Expected long-term rate of return on plan assets		8.50%	8.50%	8.50%	8.50%
Number of investment companies managing pension funds | investmentmanagers		5	5
Number of business days notice required to make withdrawals			10 days
Estimated contributions to pension plans in next fiscal year		$ 19	$ 19
Pension Benefits | UNITED STATES | Expected
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate for inflation	3.10%
Pension Benefits | UNITED STATES | Equities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage for plan assets		90.00%	90.00%
Pension Benefits | UNITED STATES | Equities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage for plan assets		97.00%	97.00%
Pension Benefits | UNITED STATES | Equities | UNITED STATES | Expected
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets	8.50%
Pension Benefits | UNITED STATES | Debt Securities [Member] | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage for plan assets		3.00%	3.00%
Pension Benefits | UNITED STATES | Debt Securities [Member] | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage for plan assets		10.00%	10.00%
Pension Benefits | UNITED STATES | Debt Securities [Member] | Expected
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets	4.10%
Pension Benefits | UNITED STATES | Pooled investment funds
Defined Benefit Plan Disclosure [Line Items]
Unfunded commitments - pooled investment funds		$ 0	$ 0
Pension Benefits | UNITED STATES | Cash and cash equivalents | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage for plan assets		1.00%	1.00%
Pension Benefits | UNITED STATES | Cash and cash equivalents | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage for plan assets		5.00%	5.00%
Pension Benefits | Foreign Retirement Plans
Defined Benefit Plan Disclosure [Line Items]
Actuarial net loss to be amortized from accumulated other comprehensive loss into net periodic benefit cost (income) in next fiscal year		$ (1)	$ (1)
Accumulated benefit obligation		155	$ 155	$ 132
Expected long-term rate of return on plan assets			5.50%	5.10%	5.03%
Estimated contributions to pension plans in next fiscal year		$ 6	$ 6
Pension Benefits | Foreign Retirement Plans | Equities | Pooled investment funds
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage for plan assets		38.00%	38.00%
Pension Benefits | Foreign Retirement Plans | Debt Securities [Member] | Pooled investment funds
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage for plan assets		37.00%	37.00%
Pension Benefits | Foreign Retirement Plans | Insurance contract
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage for plan assets		6.00%	6.00%
Pension Benefits | Foreign Retirement Plans | Diversified growth funds
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage for plan assets		19.00%	19.00%
Postretirement Benefits | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Prior service cost (credit) to be amortized from accumulated other comprehensive loss into net periodic benefit cost (income) in next fiscal year		$ (3)	$ (3)
Expected long-term rate of return on plan assets			5.50%	5.50%	5.50%

Pension Plans and Other Postr84

Pension Plans and Other Postretirement Benefits (Summary Of Components Of Net Periodic Benefit Cost (Income)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Benefits | UNITED STATES
Net periodic benefit cost (income)
Service cost	$ 13,679	$ 12,860	$ 13,034
Interest cost	13,289	13,175	11,938
Expected return on plan assets	(26,146)	(23,137)	(20,467)
Amortization of prior service cost (credit)	26	187	99
Amortization of actuarial net (gain) loss	4,725	5,243	6,891
Net periodic benefit cost (income)	5,573	8,328	11,495
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)
Actuarial net (gain) loss	(13,386)	9,140	11,095
Prior service cost (credit)	0	749	0
Amortization of actuarial net gain (loss)	(4,725)	(5,243)	(6,891)
Amortization of prior service (cost) credit	(26)	(187)	(99)
Total recognized in other comprehensive income (loss)	(18,137)	4,459	4,105
Total recognized in net periodic benefit cost (income) and other comprehensive income (loss)	(12,564)	12,787	15,600
Pension Benefits | Foreign Retirement Plans
Net periodic benefit cost (income)
Service cost	7,437	6,926	8,150
Interest cost	4,314	4,915	4,932
Expected return on plan assets	(8,479)	(6,638)	(7,077)
Amortization of prior service cost (credit)	(79)	(83)	(95)
Amortization of actuarial net (gain) loss	959	1,021	1,587
Net periodic benefit cost (income)	4,152	6,141	7,497
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)
Actuarial net (gain) loss	(3,029)	3,215	(5,461)
Amortization of actuarial net gain (loss)	(959)	(1,021)	(1,587)
Amortization of prior service (cost) credit	79	83	95
Total recognized in other comprehensive income (loss)	(3,909)	2,277	(6,953)
Total recognized in net periodic benefit cost (income) and other comprehensive income (loss)	243	8,418	544
Postretirement Benefits | UNITED STATES
Net periodic benefit cost (income)
Service cost	774	705	2,244
Interest cost	1,582	1,653	2,548
Expected return on plan assets	(1,197)	(1,239)	(1,288)
Amortization of prior service cost (credit)	(3,029)	(3,028)	(1,008)
Amortization of actuarial net (gain) loss	0	0	0
Net periodic benefit cost (income)	(1,870)	(1,909)	2,496
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)
Actuarial net (gain) loss	2,635	156	(1,826)
Prior service cost (credit)	0	0	(35,768)
Amortization of actuarial net gain (loss)	0	0	0
Amortization of prior service (cost) credit	3,029	3,028	1,008
Total recognized in other comprehensive income (loss)	5,664	3,184	(36,586)
Total recognized in net periodic benefit cost (income) and other comprehensive income (loss)	$ 3,794	$ 1,275	$ (34,090)

Pension Plans and Other Postr85

Pension Plans and Other Postretirement Benefits (Changes In The Plans' Benefit Obligations And Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Amounts recognized in the Consolidated Balance Sheets
Noncurrent assets	$ 66,495	$ 25,800
Pension Benefits | UNITED STATES
Change in benefit obligation
Benefit obligation at beginning of year	316,366	292,728
Service cost	13,679	12,860	$ 13,034
Interest cost	13,289	13,175	11,938
Actuarial net (gain) loss	25,828	6,087
Plan amendment	0	748
Benefits paid	(10,350)	(9,232)
Benefit obligation at end of year	358,812	316,366	292,728
Change in plan assets
Fair value of plan assets at beginning of year	291,092	260,911
Actual return on plan assets	65,360	20,083
Employer contributions	19,319	19,330
Benefits paid	(10,350)	(9,232)
Fair value of plan assets at end of year	365,421	291,092	260,911
Funded status	6,609	(25,274)
Amounts recognized in the Consolidated Balance Sheets
Noncurrent assets	48,515	15,188
Current liabilities	(2,793)	(2,781)
Noncurrent liabilities	(39,113)	(37,681)
Amounts recognized in the Consolidated Balance Sheets	6,609	(25,274)
Amounts recognized in accumulated other comprehensive loss
Actuarial net (gain) loss	88,950	107,061
Prior service cost (credit)	32	58
Amounts recognized in accumulated other comprehensive loss	88,982	107,119
Pension Benefits | Foreign Retirement Plans
Change in benefit obligation
Benefit obligation at beginning of year	157,101	146,748
Service cost	7,437	6,926	8,150
Interest cost	4,314	4,915	4,932
Acquisition	1,888	0
Employee contributions	766	832
Actuarial net (gain) loss	2,417	25,794
Benefits paid	(5,157)	(3,501)
Foreign currency translation	17,049	(24,613)
Benefit obligation at end of year	185,815	157,101	146,748
Change in plan assets
Fair value of plan assets at beginning of year	144,877	138,646
Actual return on plan assets	13,778	29,026
Employer contributions	5,646	5,441
Employee contributions	766	832
Benefits paid	(5,157)	(3,501)
Acquisition	1,910	0
Foreign currency translation	15,148	(25,567)
Fair value of plan assets at end of year	176,968	144,877	138,646
Funded status	(8,847)	(12,224)
Amounts recognized in the Consolidated Balance Sheets
Noncurrent assets	17,980	10,612
Current liabilities	(346)	(295)
Noncurrent liabilities	(26,481)	(22,541)
Amounts recognized in the Consolidated Balance Sheets	(8,847)	(12,224)
Amounts recognized in accumulated other comprehensive loss
Actuarial net (gain) loss	38,831	42,809
Prior service cost (credit)	118	39
Transition obligation	0	10
Amounts recognized in accumulated other comprehensive loss	38,949	42,858
Postretirement Benefits | UNITED STATES
Change in benefit obligation
Benefit obligation at beginning of year	38,110	38,517
Service cost	774	705	2,244
Interest cost	1,582	1,653	2,548
Actuarial net (gain) loss	2,506	(322)
Plan amendment	0	0
Benefits paid	(2,534)	(2,443)
Benefit obligation at end of year	40,438	38,110	38,517
Change in plan assets
Fair value of plan assets at beginning of year	23,238	23,972
Actual return on plan assets	1,067	761
Employer contributions	1,133	948
Benefits paid	(2,534)	(2,443)
Fair value of plan assets at end of year	22,904	23,238	$ 23,972
Funded status	(17,534)	(14,872)
Amounts recognized in the Consolidated Balance Sheets
Noncurrent assets	0	0
Current liabilities	(1,278)	(1,313)
Noncurrent liabilities	(16,256)	(13,559)
Amounts recognized in the Consolidated Balance Sheets	(17,534)	(14,872)
Amounts recognized in accumulated other comprehensive loss
Actuarial net (gain) loss	1,710	(925)
Prior service cost (credit)	(28,703)	(31,732)
Amounts recognized in accumulated other comprehensive loss	$ (26,993)	$ (32,657)

Pension Plans and Other Postr86

Pension Plans and Other Postretirement Benefits (Pension Plans With The Benefit Obligation In Excess Of Plan Assets) (Details) - Pension Benefits - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
UNITED STATES
Plans with the accumulated benefit obligation in excess of the fair market value of plan assets
Projected benefit obligation	$ 41,906	$ 40,462
Accumulated benefit obligation	38,105	35,939
Fair market value of plan assets	0	0
Plans with the projected benefit obligation in excess of the fair market value of plan assets
Projected benefit obligation	41,906	40,462
Fair market value of plan assets	0	0
Foreign Retirement Plans
Plans with the accumulated benefit obligation in excess of the fair market value of plan assets
Projected benefit obligation	36,687	32,407
Accumulated benefit obligation	23,704	21,310
Fair market value of plan assets	10,151	9,568
Plans with the projected benefit obligation in excess of the fair market value of plan assets
Projected benefit obligation	39,074	32,407
Fair market value of plan assets	$ 12,247	$ 9,568

Pension Plans and Other Postr87

Pension Plans and Other Postretirement Benefits (Assumptions To Calculate The Results Of Our Retirement Plans) (Details)	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Benefits | UNITED STATES
Weighted-average assumptions used to determine net periodic benefit cost (income)
Discount rate		4.25%	4.50%	4.125%
Expected long-term rate of return on plan assets	8.50%	8.50%	8.50%	8.50%
Rate of projected compensation increase		3.50%	3.50%	3.50%
Weighted-average assumptions used to determine benefit obligations
Discount rate	3.75%	3.75%	4.25%	4.50%
Rate of projected compensation increase	3.50%	3.50%	3.50%	3.50%
Pension Benefits | Foreign Retirement Plans
Weighted-average assumptions used to determine net periodic benefit cost (income)
Discount rate		2.53%	3.58%	3.11%
Expected long-term rate of return on plan assets		5.50%	5.10%	5.03%
Rate of projected compensation increase		4.20%	4.28%	4.27%
Weighted-average assumptions used to determine benefit obligations
Discount rate	2.36%	2.36%	2.53%	3.58%
Rate of projected compensation increase	4.14%	4.14%	4.20%	4.28%
Postretirement Benefits | UNITED STATES
Weighted-average assumptions used to determine net periodic benefit cost (income)
Discount rate		4.25%	4.50%	4.125%
Expected long-term rate of return on plan assets		5.50%	5.50%	5.50%
Weighted-average assumptions used to determine benefit obligations
Discount rate	3.75%	3.75%	4.25%	4.50%

Pension Plans and Other Postr88

Pension Plans and Other Postretirement Benefits (Fair Value Of The Pension And Postretirement Benefit Plans Assets By Asset Category) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Benefits | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 365,421	$ 291,092	$ 260,911
Pension Benefits | UNITED STATES | Insurance contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,605	984
Pension Benefits | UNITED STATES | Equity securities | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	286,103	232,895
Pension Benefits | UNITED STATES | Equity securities | International companies
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,074	1,757
Pension Benefits | UNITED STATES | Equity securities | Real estate investment trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,487	2,653
Pension Benefits | UNITED STATES | Money market instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	18,395	11,120
Pension Benefits | UNITED STATES | Pooled investment funds | Fixed income securities—mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,958	8,799
Pension Benefits | UNITED STATES | Pooled investment funds | International equities—mutual fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16,715	13,104
Pension Benefits | UNITED STATES | Pooled investment funds | Common collective trusts measured at net asset value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	26,084	19,780
Pension Benefits | UNITED STATES | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	335,732	270,328
Pension Benefits | UNITED STATES | Level 1 | Insurance contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | UNITED STATES | Level 1 | Equity securities | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	286,103	232,895
Pension Benefits | UNITED STATES | Level 1 | Equity securities | International companies
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,074	1,757
Pension Benefits | UNITED STATES | Level 1 | Equity securities | Real estate investment trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,487	2,653
Pension Benefits | UNITED STATES | Level 1 | Money market instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	18,395	11,120
Pension Benefits | UNITED STATES | Level 1 | Pooled investment funds | Fixed income securities—mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,958	8,799
Pension Benefits | UNITED STATES | Level 1 | Pooled investment funds | International equities—mutual fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16,715	13,104
Pension Benefits | UNITED STATES | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,605	984
Pension Benefits | UNITED STATES | Level 2 | Insurance contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,605	984
Pension Benefits | UNITED STATES | Level 2 | Equity securities | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | UNITED STATES | Level 2 | Equity securities | International companies
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | UNITED STATES | Level 2 | Equity securities | Real estate investment trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | UNITED STATES | Level 2 | Money market instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | UNITED STATES | Level 2 | Pooled investment funds | Fixed income securities—mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | UNITED STATES | Level 2 | Pooled investment funds | International equities—mutual fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | UNITED STATES | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | UNITED STATES | Level 3 | Insurance contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | UNITED STATES | Level 3 | Equity securities | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | UNITED STATES | Level 3 | Equity securities | International companies
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | UNITED STATES | Level 3 | Equity securities | Real estate investment trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | UNITED STATES | Level 3 | Money market instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | UNITED STATES | Level 3 | Pooled investment funds | Fixed income securities—mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | UNITED STATES | Level 3 | Pooled investment funds | International equities—mutual fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | Foreign Retirement Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	176,968	144,877	138,646
Pension Benefits | Foreign Retirement Plans | Insurance contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,151	9,399
Pension Benefits | Foreign Retirement Plans | Equity securities | International companies
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	755	0
Pension Benefits | Foreign Retirement Plans | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	872	0
Pension Benefits | Foreign Retirement Plans | Pooled investment funds | U. S. companies
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,621	9,341
Pension Benefits | Foreign Retirement Plans | Pooled investment funds | International companies
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	56,803	64,903
Pension Benefits | Foreign Retirement Plans | Pooled investment funds | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	63,007	55,557
Pension Benefits | Foreign Retirement Plans | Pooled investment funds | Diversified growth funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	33,465	0
Pension Benefits | Foreign Retirement Plans | Pooled investment funds | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	349
Pension Benefits | Foreign Retirement Plans | Pooled investment funds | Real estate investment trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	4,732
Pension Benefits | Foreign Retirement Plans | Pooled investment funds—mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	469	169
Pension Benefits | Foreign Retirement Plans | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	825	427
Pension Benefits | Foreign Retirement Plans | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,850	596
Pension Benefits | Foreign Retirement Plans | Level 1 | Insurance contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | Foreign Retirement Plans | Level 1 | Equity securities | International companies
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	755	0
Pension Benefits | Foreign Retirement Plans | Level 1 | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	801	0
Pension Benefits | Foreign Retirement Plans | Level 1 | Pooled investment funds—mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	469	169
Pension Benefits | Foreign Retirement Plans | Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	825	427
Pension Benefits | Foreign Retirement Plans | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,222	9,399
Pension Benefits | Foreign Retirement Plans | Level 2 | Insurance contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,151	9,399
Pension Benefits | Foreign Retirement Plans | Level 2 | Equity securities | International companies
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | Foreign Retirement Plans | Level 2 | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	71	0
Pension Benefits | Foreign Retirement Plans | Level 2 | Pooled investment funds—mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | Foreign Retirement Plans | Level 2 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | Foreign Retirement Plans | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | Foreign Retirement Plans | Level 3 | Insurance contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | Foreign Retirement Plans | Level 3 | Equity securities | International companies
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | Foreign Retirement Plans | Level 3 | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | Foreign Retirement Plans | Level 3 | Pooled investment funds—mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | Foreign Retirement Plans | Level 3 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Postretirement Benefits | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	22,904	23,238	$ 23,972
Postretirement Benefits | UNITED STATES | Insurance contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	22,904	23,238
Postretirement Benefits | UNITED STATES | Level 1 | Insurance contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Postretirement Benefits | UNITED STATES | Level 2 | Insurance contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	22,904	23,238
Postretirement Benefits | UNITED STATES | Level 3 | Insurance contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0

Pension Plans and Other Postr89

Pension Plans and Other Postretirement Benefits (Expected Benefit Payments) (Details) $ in Thousands	Dec. 31, 2017USD ($)
Pension Benefits | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
2,018	$ 11,404
2,019	12,426
2,020	13,227
2,021	14,256
2,022	15,154
2023 through 2027	92,183
Pension Benefits | Foreign Retirement Plans
Defined Benefit Plan Disclosure [Line Items]
2,018	4,061
2,019	4,087
2,020	4,540
2,021	4,637
2,022	3,773
2023 through 2027	28,938
Postretirement Benefits | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
2,018	2,815
2,019	2,659
2,020	2,511
2,021	2,391
2,022	2,278
2023 through 2027	$ 10,277

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Contingency [Line Items]
U.S. Corporate Tax Rate		35.00%	35.00%	35.00%
Tax Reform Act expense		$ 31,375	$ 0	$ 0
Deferred Tax Assets, Operating Loss Carryforwards, Foreign And State Credits		6,312	$ 2,935
Tax Expense due to Deemed Repatriation of Deferred Foreign Earnings		32,000
Unrecognized tax benefits that would impact effective tax rate if recognized		9,000
Reduction to Deferred Tax Liabilities Related to Tax Reform Act		1,000
Foreign Tax Credit due to Result of Deemed Repatriation of Foreign Earnings under the Tax Reform Act		$ 3,000
Minimum [Member]
Income Tax Contingency [Line Items]
Foreign and United States jurisdictions, period of statutes of limitations, years		3 years
Maximum [Member]
Income Tax Contingency [Line Items]
Foreign and United States jurisdictions, period of statutes of limitations, years		5 years
Subsequent Event [Member]
Income Tax Contingency [Line Items]
U.S. Corporate Tax Rate	21.00%

Income Taxes (Schedule Of Incom

Income Taxes (Schedule Of Income Before Income Tax Expense and Provision for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income before income tax expense
Domestic	$ 140,779	$ 161,687	$ 229,561
Foreign	174,663	181,521	109,410
Income before income tax expense	315,442	343,208	338,971
Current income taxes
Federal	61,188	34,213	62,491
State	3,942	9,020	11,216
Foreign	32,428	37,349	26,511
Current income taxes	97,558	80,582	100,218
Deferred income taxes
Federal	15,901	13,876	1,287
State	3,633	3,095	(936)
Foreign	7,841	2,214	(201)
Deferred income taxes	27,375	19,185	150
Total income tax expense	$ 124,933	$ 99,767	$ 100,368

Income Taxes (Reconciliation Of

Income Taxes (Reconciliation Of U.S. Federal Statutory Rate To Effective Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
State taxes, net of federal tax	1.60%	2.30%	2.00%
Foreign operations	(4.40%)	(5.80%)	(4.30%)
Domestic research tax credit	(1.10%)	(1.20%)	(1.20%)
Domestic manufacturing tax benefit	(0.80%)	(0.80%)	(1.90%)
Deemed repatriation of foreign earnings	10.10%	0.00%	0.00%
Other items and adjustments	(0.80%)	(0.40%)	0.00%
Effective income tax rate	39.60%	29.10%	29.60%

Income Taxes (Deferred Income T

Income Taxes (Deferred Income Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred income tax assets
Future employee benefits	$ 8,039	$ 30,178
Environmental and future shutdown reserves	3,327	5,737
Operating Loss and Credit Carryfowards	6,312	2,935
Trademark expenses	3,852	5,810
Foreign currency translation adjustments	3,993	6,687
Other	3,248	7,458
Gross Deferred Income Tax Assets	28,771	58,805
Valuation allowance	(5,768)	(2,935)
Total deferred income tax assets	23,003	55,870
Deferred income tax liabilities
Depreciation and amortization	45,128	29,736
Other	8,829	6,305
Total Deferred income tax liabilities	53,957	36,041
Deferred Income Tax Liabilities, Net	(30,954)
Deferred Income Tax Assets, Net		19,829
Deferred income tax assets	4,349	29,063
Deferred income tax liabilities	$ 35,303	$ 9,234

Income Taxes (Schedule of Recon

Income Taxes (Schedule of Reconciliation Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 8,810	$ 2,322	$ 1,465
Increases for tax positions of prior years	865	773	1,035
Decreases for tax positions of prior years	0	0	0
Increases for tax positions of the current year	453	5,826	533
Settlements	(260)	(111)	(497)
Lapses of statutes	(766)	0	(214)
Balance at end of year	$ 9,102	$ 8,810	$ 2,322

Other Comprehensive Income (L95

Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Pension Plans and Other Postretirement Benefits, Beginning Balance	$ (76,187)	$ (69,798)	$ (95,119)
Foreign Currency Translation Adjustments, Beginning Balance	(106,323)	(74,728)	(44,041)
Accumulated Other Comprehensive (Loss) Income, Beginning Balance	(182,510)	(144,526)	(139,160)
Other comprehensive income (loss) before reclassifications, Pension Plans and Other Postretirement Benefits	10,966	(8,565)	20,524
Other comprehensive income (loss) before reclassifications, Foreign Currency Translation Adjustments	23,849	(31,595)	(30,687)
Other comprehensive income (loss) before reclassifications, Accumulated Other Comprehensive (Loss) Income	34,815	(40,160)	(10,163)
Amounts reclassified from accumulated other comprehensive loss, Pension Plans and Other Postretirement Benefits	1,701	2,176	4,797	[1]
Amounts reclassified from accumulated other comprehensive loss, Foreign Currency Translation Adjustments	0	0	0
Amounts reclassified from accumulated other compehensive loss, Accumulated Other Comprehensive (Loss) Income	1,701	2,176	4,797
Total pension plans and other postretirement benefits	12,667	(6,389)	25,321
Foreign Currency Translation Adjustments, Other comprehensive income (loss)	23,849	(31,595)	(30,687)
Other comprehensive income (loss)	36,516	(37,984)	(5,366)
Pension Plans and Other Postretirement Benefits, Ending Balance	(63,520)	(76,187)	(69,798)
Foreign Currency Translation Adjustments, Ending Balance	(82,474)	(106,323)	(74,728)
Accumulated Other Comprehensive (Loss) Income, Ending Balance	$ (145,994)	$ (182,510)	$ (144,526)
[1]	(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 17 for further information.

Segment and Geographic Area I96

Segment and Geographic Area Information (Schedule Of Net Sales And Operating Profit By Segment) (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017USD ($)	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2017USD ($)customer		Dec. 31, 2016USD ($)customer		Dec. 31, 2015USD ($)customer
Segment Reporting Information [Line Items]
Net sales	$ 559,982	$ 548,416	$ 547,188	$ 542,818	$ 501,627	$ 516,090	$ 521,807	$ 509,927	$ 2,198,404	[1]	$ 2,049,451	[1]	$ 2,140,830	[1]
Segment operating profit									336,769		362,690		356,720
Corporate, general, and administrative expenses									(165,056)		(161,112)		(164,082)
Interest and financing expenses, net									(21,856)		(16,785)		(14,652)
Other income (expense), net									529		(2,697)		(3,097)
Income before income tax expense									$ 315,442		$ 343,208		$ 338,971
Number of customers that exceeded threshold percentage | customer									0		0		0
Operating Segments [Member]
Segment Reporting Information [Line Items]
Segment operating profit									$ 364,150		$ 385,436		$ 379,306
Operating Segments [Member] | Petroleum Additives [Member]
Segment Reporting Information [Line Items]
Net sales									2,187,283		2,034,645		2,124,995
Segment operating profit									359,832		384,906		374,934
Operating Segments [Member] | All Other [Member]
Segment Reporting Information [Line Items]
Net sales									11,121		14,806		15,835
Segment operating profit									4,318		530		4,372
Operating Segments [Member] | Lubricant additives [Member] | Petroleum Additives [Member]
Segment Reporting Information [Line Items]
Net sales									1,790,254		1,672,523		1,740,956
Operating Segments [Member] | Fuel additives [Member] | Petroleum Additives [Member]
Segment Reporting Information [Line Items]
Net sales									397,029		362,122		384,039
Corporate [Member]
Segment Reporting Information [Line Items]
Corporate, general, and administrative expenses									(27,604)		(21,783)		(22,779)
Other income (expense), net									$ 752		$ (3,660)		$ (2,904)
[1]	No single customer accounted for 10% or more of our total net sales in 2017, 2016, or 2015.

Segment and Geographic Area I97

Segment and Geographic Area Information (Schedule Of Asset Information By Segment) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total assets	$ 1,712,154	$ 1,416,436
Cash and cash equivalents	84,166	192,154	$ 93,424	$ 103,003
Trade and other accounts receivable, net	335,317	306,916
Deferred income taxes	4,349	29,063
Net property, plant, and equipment	652,281	503,745
Prepaid pension cost	66,495	25,800
Deferred charges and other assets	11,038	10,509
Petroleum Additives [Member]
Segment Reporting Information [Line Items]
Total assets	1,461,013	1,083,585
All Other [Member]
Segment Reporting Information [Line Items]
Total assets	14,089	16,019
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total assets	1,475,102	1,099,604
Corporate [Member]
Segment Reporting Information [Line Items]
Trade and other accounts receivable, net	11,026	7,547
Prepaid expenses and other current assets	31,074	26,301
Net property, plant, and equipment	32,939	29,870
Deferred charges and other assets	$ 7,003	$ 6,097

Segment and Geographic Area I98

Segment and Geographic Area Information (Schedule of Additions to Long-lived Assets and Depreciation and Amortization) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Additions to long-lived assets	$ 203,217	$ 147,684	$ 126,499
Depreciation and amortization	55,340	44,893	42,265
Petroleum Additives [Member]
Segment Reporting Information [Line Items]
Additions to long-lived assets	196,951	145,768	124,605
Depreciation and amortization	52,266	42,128	39,365
All Other [Member]
Segment Reporting Information [Line Items]
Additions to long-lived assets	0	21	22
Depreciation and amortization	13	15	12
Corporate [Member]
Segment Reporting Information [Line Items]
Additions to long-lived assets	6,266	1,895	1,872
Depreciation and amortization	$ 3,061	$ 2,750	$ 2,888

Segment and Geographic Area I99

Segment and Geographic Area Information (Schedule of Net Sales by Geographic Area) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 559,982	$ 548,416	$ 547,188	$ 542,818	$ 501,627	$ 516,090	$ 521,807	$ 509,927	$ 2,198,404	[1]	$ 2,049,451	[1]	$ 2,140,830	[1]
Total assets	1,712,154				1,416,436				1,712,154		1,416,436
Long-lived assets	652,281				503,745				652,281		503,745
UNITED STATES
Segment Reporting Information [Line Items]
Net sales									696,138		701,209		775,591
Total assets	557,488				539,792				557,488		539,792
Long-lived assets	230,049				224,790				230,049		224,790
CHINA
Segment Reporting Information [Line Items]
Net sales									224,409		203,031		184,175
Singapore [Member]
Segment Reporting Information [Line Items]
Long-lived assets	271,516				189,485				271,516		189,485
International companies
Segment Reporting Information [Line Items]
Total assets	1,154,666				876,644				1,154,666		876,644
Europe, Middle East, Africa, India [Member]
Segment Reporting Information [Line Items]
Net sales									742,337		653,341		669,198
Asia Pacific, except China
Segment Reporting Information [Line Items]
Net sales									293,137		267,585		252,221
Other foreign [Member]
Segment Reporting Information [Line Items]
Net sales									242,383		224,285		$ 259,645
Long-lived assets	$ 150,716				$ 89,470				$ 150,716		$ 89,470
[1]	No single customer accounted for 10% or more of our total net sales in 2017, 2016, or 2015.

Selected Quarterly Consolida100

Selected Quarterly Consolidated Financial Data (unaudited) (Schedule Of Selected Quarterly Consolidated Financial Data) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Selected Quarterly Financial Information [Abstract]
Net sales	$ 559,982	$ 548,416	$ 547,188	$ 542,818	$ 501,627	$ 516,090	$ 521,807	$ 509,927	$ 2,198,404	[1]	$ 2,049,451	[1]	$ 2,140,830	[1]
Gross profit	146,592	160,305	164,876	170,245	149,410	177,401	178,400	175,550	642,018		680,761		679,056
Net income	$ 4,072	$ 59,772	$ 62,728	$ 63,937	$ 45,672	$ 71,449	$ 64,389	$ 61,931	$ 190,509		$ 243,441		$ 238,603
Earnings per share - basic and diluted (in dollars per share)	$ 0.35	$ 5.04	$ 5.29	$ 5.39	$ 3.86	$ 6.03	$ 5.43	$ 5.22	$ 16.08		$ 20.54		$ 19.45
[1]	No single customer accounted for 10% or more of our total net sales in 2017, 2016, or 2015.