NewMarket (NEU) 10-Q 27 Apr 17 2017 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information	3 Months Ended
	Mar. 31, 2017shares
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q1
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	11,852,617

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Net sales	$ 542,818	$ 509,927
Cost of goods sold	372,573	334,377
Gross profit	170,245	175,550
Selling, general, and administrative expenses	39,929	40,940
Research, development, and testing expenses	36,705	39,216
Operating profit	93,611	95,394
Interest and financing expenses, net	5,572	4,188
Other income (expense), net	194	(2,260)
Income before income tax expense	88,233	88,946
Income tax expense	24,296	27,015
Net income	$ 63,937	$ 61,931
Earnings per share - basic and diluted (in dollars per share)	$ 5.39	$ 5.22
Cash dividends declared per share (in dollars per share)	$ 1.75	$ 1.60

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 63,937	$ 61,931
Pension plans and other postretirement benefits:
Amortization of prior service cost (credit) included in net periodic benefit cost, net of income tax expense (benefit) of $(296) in 2017 and $(305) in 2016	(474)	(489)
Amortization of actuarial net loss (gain) included in net periodic benefit cost, net of income tax expense (benefit) of $509 in 2017 and $570 in 2016	783	991
Total pension plans and other postretirement benefits	309	502
Foreign currency translation adjustments, net of income tax expense (benefit) of $280 in 2017 and $1,665 in 2016	3,642	(4,763)
Other comprehensive income (loss)	3,951	(4,261)
Comprehensive income	$ 67,888	$ 57,670

Consolidated Statements Of Com4

Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Amortization of prior service cost (credit) included in net periodic benefit cost, income tax expense (benefit)	$ (296)	$ (305)
Amortization of actuarial net loss (gain) included in net periodic benefit cost, income tax expense (benefit)	509	570
Foreign currency translation adjustments, income tax expense (benefit)	$ 280	$ 1,665

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 251,244	$ 192,154
Trade and other accounts receivable, less allowance for doubtful accounts	331,577	306,916
Inventories:
Finished goods and work-in-process	273,568	254,068
Raw materials	46,736	45,581
Stores, supplies, and other	10,190	11,863
Total inventories	330,494	311,512
Prepaid expenses and other current assets	28,625	26,301
Total current assets	941,940	836,883
Property, plant, and equipment, at cost	1,313,737	1,264,957
Less accumulated depreciation and amortization	774,510	761,212
Net property, plant, and equipment	539,227	503,745
Prepaid pension cost	31,021	25,800
Deferred income taxes	24,961	29,063
Intangibles (net of amortization) and goodwill	10,314	10,436
Deferred charges and other assets	10,322	10,509
Total assets	1,557,785	1,416,436
Current liabilities:
Accounts payable	153,515	141,869
Accrued expenses	93,711	104,082
Dividends payable	19,117	17,478
Income taxes payable	16,348	17,573
Other current liabilities	9,912	13,588
Total current liabilities	292,603	294,590
Long-term debt	601,413	507,275
Other noncurrent liabilities	132,754	131,320
Total liabilities	1,026,770	933,185
Commitments and contingencies
Shareholders’ equity:
Common stock and paid-in capital (without par value; authorized shares - 80,000,000; issued and outstanding shares - 11,852,617 at March 31, 2017 and 11,845,972 at December 31, 2016)	2,220	1,603
Accumulated other comprehensive loss	(178,559)	(182,510)
Retained earnings	707,354	664,158
Total shareholders' equity	531,015	483,251
Total liabilities and shareholders’ equity	$ 1,557,785	$ 1,416,436

Condensed Consolidated Balance6

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 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	11,852,617	11,845,972
Common stock, outstanding shares	11,852,617	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, 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	61,931			61,931
Other comprehensive income (loss)	(4,261)		(4,261)
Cash dividends	(18,959)			(18,959)
Repurchases of common stock (in shares)		(98,867)
Repurchases of common stock	(35,815)	$ (252)		(35,563)
Stock-based compensation (in shares)		(630)
Stock-based compensation	688	$ 680		8
Balance (in shares) at Mar. 31, 2016		11,848,949
Balance at Mar. 31, 2016	$ 391,148	$ 428	(148,787)	539,507
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	63,937			63,937
Other comprehensive income (loss)	3,951		3,951
Cash dividends	(20,741)			(20,741)
Stock-based compensation (in shares)		6,645
Stock-based compensation	$ 617	$ 617
Balance (in shares) at Mar. 31, 2017	11,852,617	11,852,617
Balance at Mar. 31, 2017	$ 531,015	$ 2,220	$ (178,559)	$ 707,354

Consolidated Statements Of Sha8

Consolidated Statements Of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Stockholders' Equity [Abstract]
Cash dividends (in dollars per share)	$ 1.75	$ 1.60

Condensed Consolidated Statemen

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Cash Flows [Abstract]
Cash and cash equivalents at beginning of year	$ 192,154	$ 93,424
Cash flows from operating activities:
Net income	63,937	61,931
Adjustments to reconcile net income to cash flows from operating activities:
Depreciation and amortization	12,306	10,680
Noncash pension and postretirement expense	2,007	3,039
Deferred income tax expense	5,283	1,671
Unrealized loss on derivative instruments, net	0	1,372
Working capital changes	(39,836)	(4,737)
Cash pension and postretirement contributions	(6,326)	(6,383)
Realized loss on derivative instruments, net	0	2,482
Other, net	(3,163)	4,212
Cash provided from (used in) operating activities	34,208	74,267
Cash flows from investing activities:
Capital expenditures	(46,346)	(28,446)
Deposits for interest rate swap	0	(4,965)
Return of deposits for interest rate swap	0	3,760
Other, net	(2,000)	(2,482)
Cash provided from (used in) investing activities	(48,346)	(32,133)
Cash flows from financing activities:
Net (repayments) borrowings under revolving credit facility	(156,000)	45,000
Issuance of 3.78% senior notes	250,000	0
Dividends paid	(20,741)	(18,959)
Repurchases of common stock	0	(35,815)
Other, net	(1,447)	(3,066)
Cash provided from (used in) financing activities	71,812	(12,840)
Effect of foreign exchange on cash and cash equivalents	1,416	(462)
Increase in cash and cash equivalents	59,090	28,832
Cash and cash equivalents at end of period	251,244	122,256
Supplemental disclosure of non-cash transations
Non-cash additions to property, plant, and equipment	16,840	18,941
Non-cash obligation under capital lease	$ 0	$ 5,068

Condensed Consolidated Statem10

Condensed Consolidated Statements of Cash Flows (Parenthetical)	Mar. 31, 2017
3.78% Senior Notes [Member]
Senior notes, interest rate	3.78%

Financial Statement Presentatio

Financial Statement Presentation	3 Months Ended
	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Financial Statement Presentation	Financial Statement Presentation In the opinion of management, the accompanying consolidated financial statements of NewMarket Corporation and its subsidiaries contain all necessary adjustments for the fair statement of, in all material respects, our consolidated financial position as of March 31, 2017 and December 31, 2016 , and our consolidated results of operations, comprehensive income, changes in shareholders' equity, and cash flows for the three months ended March 31, 2017 and March 31, 2016 . All adjustments are of a normal, recurring nature, unless otherwise disclosed. These financial statements should be read in conjunction with the consolidated financial statements and related notes included in the NewMarket Corporation Annual Report on Form 10-K for the year ended December 31, 2016 ( 2016 Annual Report), as filed with the Securities and Exchange Commission (SEC). The results of operations for the three month period ended March 31, 2017 are not necessarily indicative of the results to be expected for the full year ending December 31, 2017 . The December 31, 2016 condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America. Unless the context otherwise indicates, all references to “we,” “us,” “our,” the “company,” and “NewMarket” are to NewMarket Corporation and its consolidated subsidiaries. Certain reclassifications have been made to the accompanying consolidated financial statements to conform to the current presentation.

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2017
Segment Reporting [Abstract]
Segment Information	Segment Information The tables below show our consolidated segment results. The “All other” category includes the operations of the tetraethyl lead (TEL) business, as well as certain contracted manufacturing and services associated with Ethyl Corporation (Ethyl). Net Sales by Segment Three Months Ended (in thousands) 2017 2016 Petroleum additives Lubricant additives $ 443,961 $ 418,852 Fuel additives 96,072 87,291 Total 540,033 506,143 All other 2,785 3,784 Net sales $ 542,818 $ 509,927 Segment Operating Profit Three Months Ended (in thousands) 2017 2016 Petroleum additives $ 99,070 $ 100,389 All other 1,080 236 Segment operating profit 100,150 100,625 Corporate, general, and administrative expenses (6,669 ) (5,270 ) Interest and financing expenses, net (5,572 ) (4,188 ) Other income (expense), net 324 (2,221 ) Income before income tax expense $ 88,233 $ 88,946

Pension Plans and Other Postret

Pension Plans and Other Postretirement Benefits	3 Months Ended
	Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Pension Plans and Other Postretirement Benefits	Pension Plans and Other Postretirement Benefits The table below shows cash contributions made during the three months ended March 31, 2017 , as well as the remaining cash contributions we expect to make during the year ending December 31, 2017 , for our domestic and foreign pension plans and domestic postretirement benefit plan. (in thousands) Actual Cash Contributions for Three Months Ended March 31, 2017 Expected Remaining Cash Contributions for Year Ending December 31, 2017 Domestic plans Pension benefits $ 4,826 $ 14,478 Postretirement benefits 297 890 Foreign plans Pension benefits 1,203 3,685 The tables below present information on net periodic benefit cost (income) for our domestic and foreign pension plans and domestic postretirement benefit plan. Domestic Pension Benefits Postretirement Benefits Three Months Ended March 31, (in thousands) 2017 2016 2017 2016 Service cost $ 3,379 $ 3,107 $ 186 $ 161 Interest cost 3,360 3,266 394 420 Expected return on plan assets (6,503 ) (5,753 ) (309 ) (318 ) Amortization of prior service cost (credit) 7 (16 ) (757 ) (757 ) Amortization of actuarial net (gain) loss 1,229 1,303 0 0 Net periodic benefit cost (income) $ 1,472 $ 1,907 $ (486 ) $ (494 ) Foreign Pension Benefits Three Months Ended March 31, (in thousands) 2017 2016 Service cost $ 1,821 $ 1,843 Interest cost 1,018 1,274 Expected return on plan assets (2,024 ) (1,731 ) Amortization of prior service cost (credit) (19 ) (22 ) Amortization of actuarial net (gain) loss 225 262 Net periodic benefit cost (income) $ 1,021 $ 1,626

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share We had 24,819 shares of nonvested restricted stock and restricted stock units at March 31, 2017 and 26,804 shares of nonvested restricted stock and restricted stock units at March 31, 2016 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. Three Months Ended (in thousands, except per-share amounts) 2017 2016 Earnings per share numerator: Net income attributable to common shareholders before allocation of earnings to participating securities $ 63,937 $ 61,931 Earnings allocated to participating securities 127 131 Net income attributable to common shareholders after allocation of earnings to participating securities $ 63,810 $ 61,800 Earnings per share denominator: Weighted-average number of shares of common stock outstanding - basic and diluted 11,829 11,839 Earnings per share - basic and diluted $ 5.39 $ 5.22

Intangibles (Net of Amortizatio

Intangibles (Net of Amortization) and Goodwill	3 Months Ended
	Mar. 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 $10 million at March 31, 2017 and December 31, 2016 . The gross carrying amount and accumulated amortization of each type of intangible asset and goodwill are presented in the table below. March 31, 2017 December 31, 2016 (in thousands) Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Amortizing intangible assets Formulas and technology $ 2,693 $ 2,016 $ 2,678 $ 1,958 Contracts 2,000 50 2,000 0 Customer bases 6,945 4,036 6,938 3,961 Trademarks and trade names 1,519 1,104 1,513 1,069 Goodwill 4,363 4,295 $ 17,520 $ 7,206 $ 17,424 $ 6,988 All of the intangibles relate to the petroleum additives segment. The change in the gross carrying amount between December 31, 2016 and March 31, 2017 is due to foreign currency fluctuations. There is no accumulated goodwill impairment. Amortization expense was (in thousands): Three months ended March 31, 2017 $ 218 Three months ended March 31, 2016 1,053 Estimated amortization expense for the remainder of 2017 , as well as estimated annual amortization expense related to our intangible assets for the next five years, is expected to be (in thousands): 2017 $ 646 2018 834 2019 813 2020 504 2021 440 2022 440 We amortize contracts over 10 years; customer bases over 20 years; formulas and technology over 10 years; and trademarks and trade names over 10 years.

Long-term Debt

Long-term Debt	3 Months Ended
	Mar. 31, 2017
Long-term Debt and Capital Lease Obligations [Abstract]
Long-term Debt	Long-term Debt (in thousands) March 31, December 31, Senior notes - 4.10% due 2022 (net of related deferred financing costs) $ 346,652 $ 346,505 Senior notes - 3.78% due 2029 250,000 0 Revolving credit facility 0 156,000 Capital lease obligation 4,761 4,770 $ 601,413 $ 507,275 The outstanding 4.10% senior notes have an aggregate principal amount of $350 million and are registered under the Securities Act of 1933, as amended (Securities Act). 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. The proceeds from the 3.78% senior notes were used to pay off the outstanding amount on our revolving credit facility. The capital lease obligation in the table above is related to the Singapore manufacturing facility. The following table provides information related to the unused portion of our revolving credit facility: (in thousands) March 31, December 31, Maximum borrowing capacity under the revolving credit facility $ 650,000 $ 650,000 Outstanding borrowings under the revolving credit facility 0 156,000 Outstanding letters of credit 3,499 3,483 Unused portion of revolving credit facility $ 646,501 $ 490,517 The average interest rate for borrowings under our revolving credit facility was 2.1% during the first three months of 2017 and 1.9% during the full year of 2016 . We were in compliance with all covenants under our debt agreements at March 31, 2017 and at December 31, 2016 , as applicable.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Matters We are involved in legal proceedings that are incidental to our business and may include administrative or judicial actions. Some of these legal proceedings involve governmental authorities and relate to environmental matters. For further information, see Environmental below. While it is not possible to predict or determine with certainty the outcome of any legal proceeding, we believe the outcome of any of these proceedings, or all of them combined, will not result in a material adverse effect on our consolidated results of operations, financial condition, or cash flows. In late 2013, Afton Chemical Corporation (Afton) initiated a voluntary self-audit of its compliance with certain sections of the Toxic Substances Control Act (TSCA) under the Environmental Protection Agency's (EPA) audit policy (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. 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 $16 million at both March 31, 2017 and 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 Condensed 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 $9 million of the total accrual above at March 31, 2017 and $10 million of the total accrual above at December 31, 2016 , using discount rates ranging from 4% to 9% for both periods. The aggregate undiscounted amount for these sites was $12 million at March 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 for the Louisiana site was $4 million at both March 31, 2017 and December 31, 2016 . The amount related to remediation of groundwater and soil for the Texas site was $5 million at both March 31, 2017 and 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 Record of Decision confirming its remedies for the selected Sauget Area 2 sites. We have accrued our estimated proportional share of the remedial costs and expenses addressed in the Record of Decision. We do not believe there is any additional information available as a basis for revision of the liability that we have established at March 31, 2017 . The amount accrued for this site is not material.

Other Comprehensive Income (Los

Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss	3 Months Ended
	Mar. 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 and Other Postretirement Benefits Foreign Currency Translation Adjustments Accumulated Other Comprehensive (Loss) Income Balance at December 31, 2015 $ (69,798 ) $ (74,728 ) $ (144,526 ) Other comprehensive income (loss) before reclassifications 0 (4,763 ) (4,763 ) Amounts reclassified from accumulated other comprehensive loss (a) 502 0 502 Other comprehensive income (loss) 502 (4,763 ) (4,261 ) Balance at March 31, 2016 $ (69,296 ) $ (79,491 ) $ (148,787 ) Balance at December 31, 2016 $ (76,187 ) $ (106,323 ) $ (182,510 ) Other comprehensive income (loss) before reclassifications 0 3,642 3,642 Amounts reclassified from accumulated other comprehensive loss (a) 309 0 309 Other comprehensive income (loss) 309 3,642 3,951 Balance at March 31, 2017 $ (75,878 ) $ (102,681 ) $ (178,559 ) (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 3 in this Form 10-Q and Note 17 in our 2016 Annual Report for further information.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The carrying amount in the Condensed Consolidated Balance Sheets and the fair value of cash and cash equivalents were $251 million at March 31, 2017 and $192 million at December 31, 2016 . The fair value is categorized in Level 1 of the fair value hierarchy. No material events occurred during the three months ended March 31, 2017 requiring adjustment to the recognized balances of assets or liabilities which are recorded at fair value on a nonrecurring basis. Long-term debt – We record the carrying amount of our long-term debt related to the 4.10% senior notes at historical cost, less deferred financing costs. We record the carrying amount of our long-term debt related to the 3.78% senior notes at historical cost. 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 also based on the last quoted price closest to March 31, 2017 . The fair value of our debt instruments are categorized as Level 2. March 31, 2017 December 31, 2016 (in thousands) Carrying Amount Fair Value Carrying Amount Fair Value Long-term debt (excluding capital lease obligation) $ 596,652 $ 608,411 $ 502,505 $ 507,925

Recent Accounting Pronouncement

Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements Recently Issued 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 continue to evaluate whether we will adopt the standard retrospectively or as a cumulative-effect adjustment. We expect to continue the evaluation, analysis, and documentation of our adoption of ASU 2014-09 (including those subsequently issued updates that clarify the provisions), throughout most of this year as we work towards implementation and finalize the impact the adoption will have on our consolidated financial statements. 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.

Significant Accounting Policies

Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2017
Accounting Policies [Abstract]
Long-Term Debt	We record the carrying amount of our long-term debt related to the 4.10% senior notes at historical cost, less deferred financing costs. We record the carrying amount of our long-term debt related to the 3.78% senior notes at historical cost.

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2017
Segment Reporting [Abstract]
Consolidated Revenue by Segment	Net Sales by Segment Three Months Ended (in thousands) 2017 2016 Petroleum additives Lubricant additives $ 443,961 $ 418,852 Fuel additives 96,072 87,291 Total 540,033 506,143 All other 2,785 3,784 Net sales $ 542,818 $ 509,927
Segment Operating Profit	Segment Operating Profit Three Months Ended (in thousands) 2017 2016 Petroleum additives $ 99,070 $ 100,389 All other 1,080 236 Segment operating profit 100,150 100,625 Corporate, general, and administrative expenses (6,669 ) (5,270 ) Interest and financing expenses, net (5,572 ) (4,188 ) Other income (expense), net 324 (2,221 ) Income before income tax expense $ 88,233 $ 88,946

Pension Plans and Other Postr23

Pension Plans and Other Postretirement Benefits (Tables)	3 Months Ended
	Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Cash Contributions Made And Expected Remaining Contributions For Pension And Postretirement Benefit Plans	The table below shows cash contributions made during the three months ended March 31, 2017 , as well as the remaining cash contributions we expect to make during the year ending December 31, 2017 , for our domestic and foreign pension plans and domestic postretirement benefit plan. (in thousands) Actual Cash Contributions for Three Months Ended March 31, 2017 Expected Remaining Cash Contributions for Year Ending December 31, 2017 Domestic plans Pension benefits $ 4,826 $ 14,478 Postretirement benefits 297 890 Foreign plans Pension benefits 1,203 3,685
Domestic [Member]
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Benefit Cost (Income) For Pension And Postretirement Benefit Plans	The tables below present information on net periodic benefit cost (income) for our domestic and foreign pension plans and domestic postretirement benefit plan. Domestic Pension Benefits Postretirement Benefits Three Months Ended March 31, (in thousands) 2017 2016 2017 2016 Service cost $ 3,379 $ 3,107 $ 186 $ 161 Interest cost 3,360 3,266 394 420 Expected return on plan assets (6,503 ) (5,753 ) (309 ) (318 ) Amortization of prior service cost (credit) 7 (16 ) (757 ) (757 ) Amortization of actuarial net (gain) loss 1,229 1,303 0 0 Net periodic benefit cost (income) $ 1,472 $ 1,907 $ (486 ) $ (494 )
Foreign [Member]
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Benefit Cost (Income) For Pension And Postretirement Benefit Plans	Foreign Pension Benefits Three Months Ended March 31, (in thousands) 2017 2016 Service cost $ 1,821 $ 1,843 Interest cost 1,018 1,274 Expected return on plan assets (2,024 ) (1,731 ) Amortization of prior service cost (credit) (19 ) (22 ) Amortization of actuarial net (gain) loss 225 262 Net periodic benefit cost (income) $ 1,021 $ 1,626

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Schedule of Basic and Diluted Earnings Per Share	The following table illustrates the earnings allocation method utilized in the calculation of basic and diluted earnings per share. Three Months Ended (in thousands, except per-share amounts) 2017 2016 Earnings per share numerator: Net income attributable to common shareholders before allocation of earnings to participating securities $ 63,937 $ 61,931 Earnings allocated to participating securities 127 131 Net income attributable to common shareholders after allocation of earnings to participating securities $ 63,810 $ 61,800 Earnings per share denominator: Weighted-average number of shares of common stock outstanding - basic and diluted 11,829 11,839 Earnings per share - basic and diluted $ 5.39 $ 5.22

Intangibles (Net of Amortizat25

Intangibles (Net of Amortization) and Goodwill (Tables)	3 Months Ended
	Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Information Related to Intangible Assets and Goodwill	The gross carrying amount and accumulated amortization of each type of intangible asset and goodwill are presented in the table below. March 31, 2017 December 31, 2016 (in thousands) Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Amortizing intangible assets Formulas and technology $ 2,693 $ 2,016 $ 2,678 $ 1,958 Contracts 2,000 50 2,000 0 Customer bases 6,945 4,036 6,938 3,961 Trademarks and trade names 1,519 1,104 1,513 1,069 Goodwill 4,363 4,295 $ 17,520 $ 7,206 $ 17,424 $ 6,988
Schedule Of Amortization Expense	Amortization expense was (in thousands): Three months ended March 31, 2017 $ 218 Three months ended March 31, 2016 1,053
Schedule Of Estimated Annual Amortization Expense Related To Intangible Assets	Estimated amortization expense for the remainder of 2017 , as well as estimated annual amortization expense related to our intangible assets for the next five years, is expected to be (in thousands): 2017 $ 646 2018 834 2019 813 2020 504 2021 440 2022 440

Long-term Debt (Tables)

Long-term Debt (Tables)	3 Months Ended
	Mar. 31, 2017
Long-term Debt and Capital Lease Obligations [Abstract]
Schedule Of Long-Term Debt	(in thousands) March 31, December 31, Senior notes - 4.10% due 2022 (net of related deferred financing costs) $ 346,652 $ 346,505 Senior notes - 3.78% due 2029 250,000 0 Revolving credit facility 0 156,000 Capital lease obligation 4,761 4,770 $ 601,413 $ 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 thousands) March 31, December 31, Maximum borrowing capacity under the revolving credit facility $ 650,000 $ 650,000 Outstanding borrowings under the revolving credit facility 0 156,000 Outstanding letters of credit 3,499 3,483 Unused portion of revolving credit facility $ 646,501 $ 490,517

Other Comprehensive Income (L27

Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss (Tables)	3 Months Ended
	Mar. 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 and Other Postretirement Benefits Foreign Currency Translation Adjustments Accumulated Other Comprehensive (Loss) Income Balance at December 31, 2015 $ (69,798 ) $ (74,728 ) $ (144,526 ) Other comprehensive income (loss) before reclassifications 0 (4,763 ) (4,763 ) Amounts reclassified from accumulated other comprehensive loss (a) 502 0 502 Other comprehensive income (loss) 502 (4,763 ) (4,261 ) Balance at March 31, 2016 $ (69,296 ) $ (79,491 ) $ (148,787 ) Balance at December 31, 2016 $ (76,187 ) $ (106,323 ) $ (182,510 ) Other comprehensive income (loss) before reclassifications 0 3,642 3,642 Amounts reclassified from accumulated other comprehensive loss (a) 309 0 309 Other comprehensive income (loss) 309 3,642 3,951 Balance at March 31, 2017 $ (75,878 ) $ (102,681 ) $ (178,559 ) (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 3 in this Form 10-Q and Note 17 in our 2016 Annual Report for further information.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Estimated Fair Value Of Long-Term Debt	March 31, 2017 December 31, 2016 (in thousands) Carrying Amount Fair Value Carrying Amount Fair Value Long-term debt (excluding capital lease obligation) $ 596,652 $ 608,411 $ 502,505 $ 507,925

Segment Information (Consolidat

Segment Information (Consolidated Revenue By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Information [Line Items]
Net sales	$ 542,818	$ 509,927
Operating Segments [Member] | Petroleum Additives [Member]
Segment Information [Line Items]
Net sales	540,033	506,143
Operating Segments [Member] | All Other [Member]
Segment Information [Line Items]
Net sales	2,785	3,784
Operating Segments [Member] | Lubricant Additives [Member] | Petroleum Additives [Member]
Segment Information [Line Items]
Net sales	443,961	418,852
Operating Segments [Member] | Fuel Additives [Member] | Petroleum Additives [Member]
Segment Information [Line Items]
Net sales	$ 96,072	$ 87,291

Segment Information (Segment Op

Segment Information (Segment Operating Profit) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Information [Line Items]
Segment operating profit	$ 93,611	$ 95,394
Corporate, general, and administrative expenses	(39,929)	(40,940)
Interest and financing expenses, net	(5,572)	(4,188)
Other income (expense), net	324	(2,221)
Income before income tax expense	88,233	88,946
Operating Segments [Member]
Segment Information [Line Items]
Segment operating profit	100,150	100,625
Operating Segments [Member] | Petroleum Additives [Member]
Segment Information [Line Items]
Segment operating profit	99,070	100,389
Operating Segments [Member] | All Other [Member]
Segment Information [Line Items]
Segment operating profit	1,080	236
Corporate, Non-Segment [Member]
Segment Information [Line Items]
Corporate, general, and administrative expenses	$ (6,669)	$ (5,270)

Pension Plans and Other Postr31

Pension Plans and Other Postretirement Benefits (Cash Contributions Made And Expected Remaining Contributions For Pension And Postretirement Benefit Plans) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)
Domestic Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual Cash Contributions, Pension benefits	$ 4,826
Expected Remaining Cash Contributions	14,478
Domestic Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual Cash Contributions, Postretirement benefits	297
Expected Remaining Cash Contributions	890
Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual Cash Contributions, Pension benefits	1,203
Expected Remaining Cash Contributions	$ 3,685

Pension Plans and Other Postr32

Pension Plans and Other Postretirement Benefits (Net Periodic Benefit Cost (Income) For Pension And Postretirement Benefit Plans) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Domestic Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3,379	$ 3,107
Interest cost	3,360	3,266
Expected return on plan assets	(6,503)	(5,753)
Amortization of prior service cost (credit)	7	(16)
Amortization of actuarial net (gain) loss	1,229	1,303
Net periodic benefit cost (income)	1,472	1,907
Domestic Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	186	161
Interest cost	394	420
Expected return on plan assets	(309)	(318)
Amortization of prior service cost (credit)	(757)	(757)
Amortization of actuarial net (gain) loss	0	0
Net periodic benefit cost (income)	(486)	(494)
Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,821	1,843
Interest cost	1,018	1,274
Expected return on plan assets	(2,024)	(1,731)
Amortization of prior service cost (credit)	(19)	(22)
Amortization of actuarial net (gain) loss	225	262
Net periodic benefit cost (income)	$ 1,021	$ 1,626

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Anti-dilutive shares of nonvested restricted stock and restricted stock units that were excluded from the calculation of diluted earnings per share (in shares)	24,819	26,804
Earnings per share numerator:
Net income attributable to common shareholders before allocation of earnings to participating securities	$ 63,937	$ 61,931
Earnings allocated to participating securities	127	131
Net income attributable to common shareholders after allocation of earnings to participating securities	$ 63,810	$ 61,800
Earnings per share denominator:
Weighted-average number of shares of common stock outstanding - basic and diluted (in shares)	11,829,000	11,839,000
Earnings per share - basic and diluted (in dollars per share)	$ 5.39	$ 5.22

Intangibles (Net of Amortizat34

Intangibles (Net of Amortization) and Goodwill (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Net carrying amount of intangibles and goodwill	$ 10,314,000	$ 10,436,000
Accumulated goodwill impairment	$ 0	$ 0
Formulas And Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic life, in years	10 years
Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic life, in years	10 years
Customer Bases [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic life, in years	20 years
Trademarks And Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic life, in years	10 years

Intangibles (Net of Amortizat35

Intangibles (Net of Amortization) and Goodwill (Schedule Of Information Related To Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Amortizing intangible assets, Accumulated Amortization	$ 7,206	$ 6,988
Goodwill, Gross Carrying Amount	4,363	4,295
Amortizing intangible assets and Goodwill, Gross Carrying Amount	17,520	17,424
Formulas And Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizing intangible assets, Gross Carrying Amount	2,693	2,678
Amortizing intangible assets, Accumulated Amortization	2,016	1,958
Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizing intangible assets, Gross Carrying Amount	2,000	2,000
Amortizing intangible assets, Accumulated Amortization	50	0
Customer Bases [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizing intangible assets, Gross Carrying Amount	6,945	6,938
Amortizing intangible assets, Accumulated Amortization	4,036	3,961
Trademarks And Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizing intangible assets, Gross Carrying Amount	1,519	1,513
Amortizing intangible assets, Accumulated Amortization	$ 1,104	$ 1,069

Intangibles (Net of Amortizat36

Intangibles (Net of Amortization) and Goodwill (Schedule Of Amortization Expense And Estimated Annual Amortization Expense Related To Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 218	$ 1,053
2,017	646
2,018	834
2,019	813
2,020	504
2,021	440
2,022	$ 440

Long-term Debt (Narrative) (Det

Long-term Debt (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Debt Instrument [Line Items]
Issuance of 3.78% senior notes	$ 250,000,000	$ 0
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Average interest rate during the period	2.10%	1.90%
4.10% Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes, interest rate	4.10%
Principal amount of debt	$ 350,000,000
3.78% Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes, interest rate	3.78%
Issuance of 3.78% senior notes	$ 250,000,000
Annual principal payments	$ 50,000,000

Long-term Debt (Schedule Of Lon

Long-term Debt (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt and capital lease obligation	$ 601,413	$ 507,275
4.10% Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes, interest rate	4.10%
Debt instruments maturity date	2,022
Long-term debt and capital lease obligation	$ 346,652	346,505
3.78% Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes, interest rate	3.78%
Debt instruments maturity date	2,029
Long-term debt and capital lease obligation	$ 250,000	0
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt and capital lease obligation	0	156,000
Capital Lease Obligation [Member]
Debt Instrument [Line Items]
Long-term debt and capital lease obligation	$ 4,761	$ 4,770

Long-term Debt (Schedule Of Unu

Long-term Debt (Schedule Of Unused Portion Of Revolving Credit Facility) (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt	$ 601,413,000	$ 507,275,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity under the revolving credit facility	650,000,000	650,000,000
Long-term debt	0	156,000,000
Outstanding letters of credit	3,499,000	3,483,000
Unused portion of revolving credit facility	$ 646,501,000	$ 490,517,000

Commitments and Contingencies (

Commitments and Contingencies (Environmental) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Site Contingency [Line Items]
Accruals for environmental remediation, dismantling, and decontamination	$ 16	$ 16
Former TEL Plant Site Louisiana And Houston Texas Plant Site [Member]
Site Contingency [Line Items]
Accruals for environmental remediation, dismantling, and decontamination	9	10
Accruals for environmental remediation, dismantling, and decontamination, undiscounted	12	13
Former TEL Plant Site, Louisiana [Member]
Site Contingency [Line Items]
Accrual for remediation of groundwater and soil	4	4
Houston, Texas Plant Site [Member]
Site Contingency [Line Items]
Accrual for remediation of groundwater and soil	$ 5	$ 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%

Other Comprehensive Income (L41

Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss (Schedule of Components of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Pension Plans and Other Postretirement Benefits, Beginning Balance		$ (76,187)	$ (69,798)
Foreign Currency Translation Adjustments, Beginning Balance		(106,323)	(74,728)
Accumulated Other Comprehensive (Loss) Income, Beginning Balance		(182,510)	(144,526)
Other comprehensive income (loss) before reclassifications, Pension Plans and Other Postretirement Benefits		0	0
Other comprehensive income (loss) before reclassifications, Foreign Currency Translation Adjustments		3,642	(4,763)
Other comprehensive income (loss) before reclassifications, Accumulated Other Comprehensive (Loss) Income		3,642	(4,763)
Amounts reclassified from accumulated other comprehensive loss, Pension Plans and Other Postretirement Benefits	[1]	309	502
Amounts reclassified from accumulated other comprehensive loss, Foreign Currency Translation Adjustments		0	0
Amounts reclassified from accumulated other comprehensive loss, Accumulated Other Comprehensive (Loss) Income		309	502
Total pension plans and other postretirement benefits		309	502
Other comprehensive income (loss), Foreign Currency Translation Adjustments		3,642	(4,763)
Other comprehensive income (loss)		3,951	(4,261)
Pension Plans and Other Postretirement Benefits, Ending Balance		(75,878)	(69,296)
Foreign Currency Translation Adjustments, Ending Balance		(102,681)	(79,491)
Accumulated Other Comprehensive (Loss) Income, Ending Balance		$ (178,559)	$ (148,787)
[1]	The pension plan and other postretirement benefit components of accumulated other comprehensive loss are included in the computation of net periodic benefit cost (income). See Note 3 in this Form 10-Q and Note 17 in our 2016 Annual Report for further information.

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 251,244	$ 192,154	$ 122,256	$ 93,424
Carrying Amount in Consolidated Balance Sheets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	251,244	192,154
Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	$ 251,244	$ 192,154

Fair Value Measurements (Estima

Fair Value Measurements (Estimated Fair Value Of Long-Term Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt (excluding capital lease obligation)	$ 596,652	$ 502,505
Long-term debt (excluding capital lease obligation), Fair Value	$ 608,411	$ 507,925
4.10% Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes, interest rate	4.10%
3.78% Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes, interest rate	3.78%