Murphy USA (MUSA) 10-K 20 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]
Entity Registrant Name	Murphy USA Inc.
Trading Symbol	MUSA
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Entity Central Index Key	1,573,516
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Entity Well-Known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Common Stock, Shares Outstanding		33,867,494
Entity Public Float			$ 2,671,809,000

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 170,028	$ 153,813	$ 102,335
Accounts receivable—trade, less allowance for doubtful accounts of $1,094 in 2017 and $1,891 in 2016	225,268	183,519
Inventories, at lower of cost or market	182,477	153,351
Prepaid expenses and other current assets	36,521	24,871
Total current assets	614,294	515,554
Property, plant and equipment, at cost less accumulated depreciation and amortization of $874,675 in 2017 and $780,426 in 2016	1,679,470	1,532,655
Other assets	37,275	40,531
Total assets	2,331,039	2,088,740	1,886,241
Current liabilities
Current maturities of long-term debt	19,887	40,596
Trade accounts payable and accrued liabilities	513,464	473,370
Income taxes payable	0	594
Total current liabilities	533,351	514,560
Long-term debt, including capitalized lease obligations	860,864	629,622
Deferred income taxes	154,245	204,656
Asset retirement obligations	28,159	26,200
Deferred credits and other liabilities	16,018	16,626
Total liabilities	1,592,637	1,391,664
Stockholders' Equity
Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding)	0	0
Common Stock, par $0.01, (authorized 200,000,000 shares, 46,767,164 and 46,767,164 shares issued at 2017 and 2016, respectively)	468	468
Treasury stock (12,675,630 and 9,831,196 shares held at December 31, 2017 and December 31, 2016, respectively)	(806,511)	(608,001)
Additional paid in capital (APIC)	549,910	555,338
Retained earnings	994,535	749,271
Total stockholders' equity	738,402	697,076	$ 792,290	$ 858,705
Total liabilities and stockholders' equity	$ 2,331,039	$ 2,088,740

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Accounts receivable - trade, allowance for doubtful accounts	$ 1,094	$ 1,891
Accumulated depreciation and amortization	$ 874,675	$ 780,426
Preferred stock par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock shares authorized (in shares)	20,000,000	20,000,000
Preferred stock shares outstanding (in shares)	0	0
Common stock par value (in dollars per share)	$ 0.01	$ 0.01
Common stock shares authorized (in shares)	200,000,000	200,000,000
Common stock shares issued (in shares)	46,767,164	46,767,164
Treasury stock (in shares)	12,675,630	9,831,196

Consolidated Income Statements

Consolidated Income Statements - USD ($) shares in Thousands, $ 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
Operating Revenues
Petroleum product sales	[1]									$ 10,287,856	$ 9,070,623	$ 10,304,689
Merchandise sales										2,372,658	2,338,586	2,273,888
Other operating revenues										166,039	185,344	120,834
Total operating revenues		$ 3,379,500	$ 3,236,300	$ 3,211,100	$ 2,999,600	$ 3,055,800	$ 3,042,700	$ 3,005,800	$ 2,490,300	12,826,553	11,594,553	12,699,411
Operating Expenses
Petroleum product cost of goods sold	[1]									9,773,211	8,603,953	9,794,475
Merchandise cost of goods sold										1,991,404	1,974,486	1,946,423
Station and other operating expenses										514,873	493,320	486,383
Depreciation and amortization										116,966	98,610	86,568
Selling, general and administrative										141,171	122,669	129,277
Accretion of asset retirement obligations										1,785	1,650	1,521
Total operating expenses										12,539,410	11,294,688	12,444,647
Gain (loss) on sale of assets										(3,950)	88,212	(4,658)
Income from operations										283,193	388,077	250,106
Other income (expense)
Interest income										1,309	578	2,177
Interest expense										(46,660)	(39,704)	(33,531)
Other nonoperating income (expense)										2,180	3,080	(463)
Total other income (expense)										(43,171)	(36,046)	(31,817)
Income from continuing operations before income taxes		51,200	108,700	89,900	(9,800)	66,800	71,800	74,100	139,300	240,022	352,031	218,289
Income tax expense (benefit)										(5,242)	130,539	80,698
Income from continuing operations		124,900	67,900	55,500	(3,000)	43,800	45,500	46,300	85,900	245,264	221,492	137,591
Income from discontinued operations, net of income taxes										0	0	38,749
Net Income		$ 124,900	$ 67,900	$ 55,500	$ (3,000)	$ 43,800	$ 45,500	$ 46,300	$ 85,900	$ 245,264	$ 221,492	$ 176,340
Earnings per share - basic:
Income from continuing operations (in dollars per share)		$ 3.62	$ 1.92	$ 1.52	$ (0.08)	$ 1.16	$ 1.17	$ 1.18	$ 2.10	$ 6.85	$ 5.64	$ 3.17
Income from discontinued operations (in dollars per share)										0	0	0.89
Net income - basic (in dollars per share)		3.62	1.92	1.52	(0.08)	1.16	1.17	1.18	2.10	6.85	5.64	4.06
Earnings per share - diluted:
Income from continuing operations (in dollars per share)		3.58	1.90	1.51	(0.08)	1.14	1.16	1.17	2.08	6.78	5.59	3.14
Income from discontinued operations (in dollars per share)										0	0	0.88
Net income - diluted (in dollars per share)		$ 3.58	$ 1.90	$ 1.51	$ (0.08)	$ 1.14	$ 1.16	$ 1.17	$ 2.08	$ 6.78	$ 5.59	$ 4.02
Weighted-average shares outstanding (in thousands):
Basic (in shares)										35,816	39,269	43,434
Diluted (in shares)										36,156	39,646	43,794
Excise taxes										$ 1,973,112	$ 1,961,478	$ 1,968,629
[1]	Years Ended December 31,(Thousands of dollars except per share amounts)2017 2016 2015 Supplemental information: (a) Includes excise taxes of:$1,973,112 $1,961,478 $1,968,629

Consolidated Statements of Cash

Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Operating Activities
Net income	$ 245,264	$ 221,492	$ 176,340
Adjustments to reconcile net income to net cash provided by operating activities
(Income) loss from discontinued operations, net of taxes	0	0	(38,749)
Depreciation and amortization	116,966	98,610	86,568
Deferred and noncurrent income tax charges (benefits)	(50,411)	40,407	40,556
Accretion of asset retirement obligations	1,785	1,650	1,521
Pretax (gains) losses from sale of assets	3,950	(88,212)	4,658
Net decrease (increase) in noncash operating working capital	(36,954)	53,726	(46,586)
Other operating activities - net	3,025	9,767	9,417
Net cash provided by (used in) continuing operations	283,625	337,440	233,725
Net cash provided by (used in) discontinued operations	0	0	(17,887)
Net cash provided by operating activities	283,625	337,440	215,838
Investing Activities
Property additions	(258,257)	(262,144)	(205,225)
Proceeds from sale of assets	887	85,327	729
Changes in restricted cash	0	68,571	(68,571)
Other investing activities - net	(4,737)	(28,963)	(2,889)
Investing activities of discontinued operations
Sales proceeds	0	0	93,765
Other	0	2,355	(7,443)
Net cash required by investing activities	(262,107)	(134,854)	(189,634)
Financing Activities
Purchase of treasury stock	(205,992)	(323,272)	(248,695)
Repayments of long-term debt	(131,412)	(20,438)	(146)
Additions to long-term debt	338,750	200,000	0
Debt issuance costs	(1,100)	(3,240)	(58)
Amounts related to share-based compensation	(5,549)	(4,158)	(3,075)
Net cash required by financing activities	(5,303)	(151,108)	(251,974)
Net change in cash and cash equivalents	16,215	51,478	(225,770)
Cash and cash equivalents at January 1	153,813	102,335	328,105
Cash and cash equivalents at December 31	170,028	153,813	102,335
Cash and cash equivalents of continuing operations at December 31	$ 170,028	$ 153,813	$ 102,335

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	APIC	Retained Earnings
Balance at Dec. 31, 2014	$ 858,705	$ 468	$ (51,073)	$ 557,871	$ 351,439
Balance (in shares) at Dec. 31, 2014		46,767,164
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	176,340				176,340
Purchase of treasury stock	(248,695)		(248,695)
Issuance of common stock	0	$ 0
Issuance of treasury stock	0		(5,629)	(5,629)
Amounts related to share-based compensation	(3,075)			(3,075)
Share-based compensation expense	9,015			9,015
Balance at Dec. 31, 2015	792,290	$ 468	(294,139)	558,182	527,779
Balance (in shares) at Dec. 31, 2015		46,767,164
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	221,492				221,492
Purchase of treasury stock	(323,272)		(323,272)
Issuance of common stock	0	$ 0
Issuance of treasury stock	0		(9,410)	(9,410)
Amounts related to share-based compensation	(2,748)			(2,748)
Share-based compensation expense	9,314			9,314
Balance at Dec. 31, 2016	$ 697,076	$ 468	(608,001)	555,338	749,271
Balance (in shares) at Dec. 31, 2016	46,767,164	46,767,164
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 245,264				245,264
Purchase of treasury stock	(205,992)		(205,992)
Issuance of common stock	0	$ 0
Issuance of treasury stock	(108)		(7,482)	(7,374)
Amounts related to share-based compensation	(5,549)			(5,549)
Share-based compensation expense	7,495			7,495
Balance at Dec. 31, 2017	$ 738,402	$ 468	$ (806,511)	$ 549,910	$ 994,535
Balance (in shares) at Dec. 31, 2017	46,767,164	46,767,164

Description of Business and Bas

Description of Business and Basis of Presentation	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Basis of Presentation	Description of Business and Basis of Presentation The business of Murphy USA Inc. and its subsidiaries (“Murphy USA” or the “Company”) primarily consists of the U.S. retail marketing business that was separated from its former parent company, Murphy Oil Corporation (“Murphy Oil”), plus other assets, liabilities and operating expenses of Murphy Oil that were associated with supporting the activities of the U.S. retail marketing operations. Murphy USA was incorporated in March 2013. The separation was approved by the Murphy Oil board of directors on August 7, 2013, and was completed on August 30, 2013 through the distribution of 100% of the outstanding capital stock of Murphy USA to holders of Murphy Oil common stock on the record date of August 21, 2013. Following the separation, Murphy USA is an independent, publicly traded company, and Murphy Oil retains no ownership interest in Murphy USA. Murphy USA markets refined products through a network of retail gasoline stores and unbranded wholesale customers. Murphy USA’s owned retail stores are almost all located in close proximity to Walmart stores in 26 states and use the brand name Murphy USA®. Murphy USA also markets gasoline and other products at standalone stores under the Murphy Express brand. At December 31, 2017 , Murphy USA had a total of 1,446 Company stores. The Company also has certain product supply and wholesale assets, including product distribution terminals and pipeline positions.

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies PRINCIPLES OF CONSOLIDATION – These consolidated financial statements were prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) and include the accounts of Murphy USA Inc. and its subsidiaries for all periods presented. All significant intercompany accounts and transactions within the consolidated financial statements have been eliminated. REVENUE RECOGNITION – Revenues from sales of refined petroleum products are recorded when deliveries have occurred and legal ownership of the commodity transfers to the customer, which may include related party sales to other subsidiaries of Murphy USA. Title transfer for bulk refined products generally occur at pipeline custody points or upon truck loading at product terminals. Refined products sold at retail stores are recorded when the customer takes delivery at the pump. Merchandise revenues are recorded at the point of sale. Rebates from vendors are recognized as a reduction of cost of goods sold when the related inventory item is sold. Incentives that are derived from contractual provisions are accrued based on past experience, when estimable, and are recognized in cost of goods sold. The Company enters into buy/sell and similar arrangements when petroleum products are held at one location but are needed at a different location. The Company often pays or receives funds related to the buy/sell arrangement based on location or quality differences. The Company accounts for such transactions on a net basis in its Consolidated Income Statements. SHIPPING AND HANDLING COSTS – Costs incurred for the shipping and handling of motor fuel are included in Petroleum product cost of goods sold in the Consolidated Income Statements. Costs incurred for the shipping and handling of convenience store merchandise are included in Merchandise cost of goods sold in the Consolidated Income Statements. TAXES COLLECTED FROM CUSTOMERS AND REMITTED TO GOVERNMENT AUTHORITIES – Excise and other taxes collected on sales of refined products and remitted to governmental agencies are included in operating revenues and operating expenses in the Consolidated Income Statements. Excise taxes on petroleum products collected and remitted were $1.97 billion in 2017 , $1.96 billion in 2016 , and $1.97 billion in 2015 . CASH EQUIVALENTS – Short-term investments, which include government securities, money market funds and other instruments with government securities as collateral, that have an original maturity of three months or less from the date of purchase are classified as cash equivalents. ACCOUNTS RECEIVABLE – The Company’s accounts receivable are recorded at the invoiced amount and do not bear interest. The accounts receivable primarily consists of amounts owed to the Company from credit card companies and by customers for wholesale sales of refined petroleum products. The allowance for doubtful accounts is the Company’s best estimate of the amount of probable credit losses on these receivables. The Company reviews this allowance for adequacy at least quarterly and bases its assessment on a combination of current information about its customers and historical write-off experience. Any trade accounts receivable balances written off are charged against the allowance for doubtful accounts. The Company has not experienced any significant credit-related losses in the past three years. INVENTORIES – Inventories of most finished products are valued at the lower of cost, generally applied on a last-in, first-out (“LIFO”) basis, or market. Any increments to LIFO inventory volumes are valued based on the first purchase price for these volumes during the year. Merchandise inventories held for resale are carried at average cost. Materials and supplies are valued at the lower of average cost or estimated value. VENDOR ALLOWANCES AND REBATES – Murphy USA receives payments for vendor allowances, volume rebates and other related payments from various suppliers of its convenience store merchandise. Vendor allowances for price markdowns are credited to merchandise cost of goods sold during the period the related markdown is recognized. Volume rebates of merchandise are recorded as reductions to merchandise cost of goods sold when the merchandise qualifying for the rebate is sold. Slotting and stocking allowances received from a vendor are recorded as a reduction to cost of sales over the period covered by the agreement. PROPERTY, PLANT AND EQUIPMENT – Additions to property, plant and equipment, including renewals and betterments, are capitalized and recorded at cost. Certain marketing facilities are primarily depreciated using the composite straight-line method with depreciable lives ranging from 16 to 25 years. Gasoline stations, improvements to gasoline stations and other assets are depreciated over 3 to 50 years by individual unit on the straight-line method. In 2017, we revised the historical presentation of gains and losses on asset disposals or retirements to include them as a separate line item in income from operations. The Company capitalizes interest costs as a component of construction in progress on individually significant projects based on the weighted average interest rates incurred on its long-term borrowings. Total interest cost capitalized in 2017 was $3.8 million and $0.3 million in 2016. The Company has undertaken like-kind exchange ("LKE") transactions under the Federal tax code in an effort to acquire and sell real and personal property in a tax efficient manner. The Company generally enters into forward transactions, in which property is sold and the proceeds are reinvested by acquiring similar property; and reverse transactions, in which property is acquired and similar property is subsequently sold. A qualified LKE intermediary is used to facilitate these LKE transactions. Proceeds from forward LKE transactions are held by the intermediary and are classified as restricted cash on the Company's balance sheet because the funds must be reinvested in similar properties. If the acquisition of suitable LKE properties is not completed within 180 days of the sale of the Company-owned property, the proceeds are distributed to the Company by the intermediary and are reclassified as available cash and applicable income taxes are determined. An exchange accommodation titleholder, a type of variable interest entity, is used to facilitate reverse like-kind exchanges. The acquired assets are held by the exchange accommodation titleholder until the exchange transactions are complete. If the Company determines that it is the primary beneficiary of the exchange accommodation titleholder, the replacements assets held by the exchange accommodation titleholder are consolidated and recorded in Property, Plant and Equipment on the Consolidated Balance Sheets. The unspent proceeds that are held in trust with the intermediary are recorded as noncurrent assets in the Consolidated Balance Sheet as the cash was restricted for the acquisition of property, plant and equipment. At December 31, 2017 and December 31, 2016 , the Company had no open LKE transactions with an intermediary. IMPAIRMENT OF ASSETS – Long-lived assets, which include property and equipment and finite-lived intangible assets, are tested for recoverability whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. A long-lived asset is not recoverable if its carrying amount exceeds the sum of the undiscounted cash flows expected to result from its use and eventual disposition. If a long-lived asset is not recoverable, an impairment loss is recognized for the amount by which the carrying amount of the long-lived asset exceeds its fair value, with fair value determined based on discounted estimated net cash flows or other appropriate methods. ASSET RETIREMENT OBLIGATIONS – The Company records a liability for asset retirement obligations (“ARO”) equal to the fair value of the estimated cost to retire an asset. The ARO liability is initially recorded in the period in which the obligation meets the definition of a liability, which is generally when the asset is placed in service. The ARO liability is estimated using existing regulatory requirements and anticipated future inflation rates. When the liability is initially recorded, the Company increases the carrying amount of the related long-lived asset by an amount equal to the original liability. The liability is increased over time to reflect the change in its present value, and the capitalized cost is depreciated over the useful life of the related long-lived asset. The Company reevaluates the adequacy of its recorded ARO liability at least annually. Actual costs of asset retirements such as dismantling service stations and site restoration are charged against the related liability. Any difference between costs incurred upon settlement of an asset retirement obligation and the recorded liability is recognized as a gain or loss in the Company’s Consolidated Income Statements. ENVIRONMENTAL LIABILITIES – A liability for environmental matters is established when it is probable that an environmental obligation exists and the cost can be reasonably estimated. If there is a range of reasonably estimated costs, the most likely amount will be recorded, or if no amount is most likely, the minimum of the range is used. Related expenditures are charged against the liability. Environmental remediation liabilities have not been discounted for the time value of future expected payments. Environmental expenditures that have future economic benefit are capitalized. INCOME TAXES – The Company accounts for income taxes using the asset and liability method. Under this method, income taxes are provided for amounts currently payable and for amounts deferred as tax assets and liabilities based on differences between the financial statement carrying amounts and the tax bases of existing assets and liabilities. Deferred income taxes are measured using the enacted tax rates that are assumed will be in effect when the differences reverse. The Company routinely assesses the realizability of deferred tax assets based on available positive and negative evidence including assumptions of future taxable income, tax planning strategies and other pertinent factors. A deferred tax asset valuation allowance is recorded when evidence indicates that it is more likely than not that all or a portion of these deferred tax assets will not be realized in a future period. The accounting principles for income tax uncertainties permit recognition of income tax benefits only when they are more likely than not to be realized. The Company’s results of operations were included in the consolidated federal income tax return of Murphy Oil prior to the separation, while in most cases, these results have been included in the various state tax returns of Murphy USA historically. The Company has elected to classify any interest expense and penalties related to the underpayment of income taxes in Income tax expense in the Consolidated Income Statements. DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES – The fair value of a derivative instrument is recognized as an asset or liability in the Company’s Consolidated Balance Sheets. Upon entering into a derivative contract, the Company may designate the derivative as either a fair value hedge or a cash flow hedge, or decide that the contract is not a hedge, and therefore, recognize changes in the fair value of the contract in earnings. The Company documents the relationship between the derivative instrument designated as a hedge and the hedged items as well as its objective for risk management and strategy for use of the hedging instrument to manage the risk. See Note 12 and Note 15 for further information about the Company’s derivatives. STOCK-BASED COMPENSATION – The fair value of awarded stock options, restricted stock, restricted stock units and performance stock units is determined based on a combination of management assumptions for awards issued. The Company uses the Black-Scholes option pricing model for computing the fair value of stock options. The primary assumptions made by management included the expected life of the stock option award and the expected volatility of the Company’s common stock prices. The Company uses both historical data and current information to support its assumptions. Stock option expense is recognized on a straight-line basis over the requisite service period of three years. The Company uses a Monte Carlo valuation model to determine the fair value of performance-based stock units that are based on performance compared against a peer group and the related expense is recognized over the three -year requisite service period. Management estimates the number of all awards that will not vest and adjusts its compensation expense accordingly. Differences between estimated and actual vested amounts are accounted for as an adjustment to expense when known. See Note 10 for a discussion of the basis of allocation of such costs. USE OF ESTIMATES – In preparing the financial statements of the Company in conformity with U.S. GAAP, management has made a number of estimates and assumptions related to the reporting of assets, liabilities, revenues, and expenses and the disclosure of contingent assets and liabilities. Actual results may differ from the estimates. On an ongoing basis, we review our estimates based on currently available information. Changes in facts and circumstances may result in revised estimates.

Discontinued Operations

Discontinued Operations	12 Months Ended
	Dec. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	Discontinued Operations In September 2015, the Company determined that it had met held for sale criteria for its Hereford, Texas ethanol production facility. On September 25, 2015, the Company signed a letter of intent to sell this subsidiary for a gain and the transaction closed on November 12, 2015. We have classified the results of the Hereford plant as discontinued operations in our Consolidated Income Statement for all periods presented. The financial results of our Hereford plant through December 31, 2015 are presented as income from discontinued operations, net of income taxes on our Consolidated Income Statement. The results of the Hereford ethanol plant have been included along with "Corporate" as a reconciling item within our segment footnote. The following table presents financial results of the Hereford business: Twelve months ended December 31, (Thousands of dollars) 2015 Operating Revenues Ethanol sales $ 154,502 Total operating revenues 154,502 Operating expenses Ethanol cost of goods sold 121,753 Station and other operating expenses 27,881 Depreciation and amortization 333 Selling, general and administrative expenses 1,382 Total operating expenses 151,349 Gain (loss) on sale of assets 60,782 Income from operations before taxes 63,935 Income taxes 25,186 Net income $ 38,749 The following table presents cash flow of the Hereford ethanol plant: Twelve months ended December 31, (Thousands of dollars) 2015 Net cash provided by (used in) discontinued operating activities $ (17,887 ) Net cash provided by (used in) discontinued investing activities $ 86,322

Inventories

Inventories	12 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories consisted of the following: December 31, (Thousands of dollars) 2017 2016 Finished products - FIFO basis $ 231,927 $ 207,903 Less LIFO reserve - finished products (167,201 ) (153,319 ) Finished products - LIFO basis 64,726 54,584 Store merchandise for resale 104,789 95,649 Materials and supplies 12,962 3,118 Total inventories $ 182,477 $ 153,351 At December 31, 2017 and 2016 , the replacement cost (market value) of last-in, first-out (LIFO) inventories exceeded the LIFO carrying value by $167.2 million and $153.3 million , respectively.

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and Equipment December 31, 2017 December 31, 2016 (Thousands of dollars) Estimated Useful Life Cost Net Cost Net Land $ 586,502 $ 586,502 $ 577,743 $ 577,743 Pipeline and terminal facilities 16 to 25 years 72,019 42,975 67,946 41,218 Retail gasoline stations 3 to 50 years 1,752,555 968,900 1,565,275 867,165 Buildings 20 to 45 years 54,584 42,898 33,375 22,310 Other 3 to 20 years 88,485 38,195 68,742 24,219 $ 2,554,145 $ 1,679,470 $ 2,313,081 $ 1,532,655 Depreciation expense of $115 million , $97 million and $86 million was recorded for the years ended December 31, 2017 , 2016 and 2015 , respectively.

Accounts Payable and Accrued Li

Accounts Payable and Accrued Liabilities	12 Months Ended
	Dec. 31, 2017
Payables and Accruals [Abstract]
Accounts Payable and Accrued Liabilities	Accounts Payable and Accrued Liabilities Trade accounts payable and accrued liabilities consisted of the following: December 31, (Thousands of dollars) 2017 2016 Trade accounts payable $ 339,606 $ 309,988 Excise taxes/withholdings payable 89,454 76,552 Accrued insurance obligations 21,404 21,631 Accrued taxes other than income 25,282 26,740 Other 37,718 38,459 Accounts payable and accrued liabilities $ 513,464 $ 473,370

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Long-term debt consisted of the following: December 31, (Thousands of dollars) 2017 2016 6.00% senior notes due 2023 (net of unamortized discount of $4,957 at 2017 and $5,826 at 2016) $ 495,043 $ 494,174 5.625% senior notes due 2027 (net of unamortized discount of $3,496 at 2017) 296,504 — Term loan due 2020 (effective rate of 4.15% at December 31, 2017) 92,000 180,000 Capitalized lease obligations, vehicles, due through 2021 2,359 1,451 Unamortized debt issuance costs (5,155 ) (5,407 ) Total long-term debt 880,751 670,218 Less current maturities 19,887 40,596 Total long-term debt, net of current $ 860,864 $ 629,622 Senior Notes On August 14, 2013, Murphy Oil USA, Inc., our primary operating subsidiary, issued 6.00% Senior Notes due 2023 (the “2023 Senior Notes”) in an aggregate principal amount of $500 million . The 2023 Senior Notes are fully and unconditionally guaranteed by Murphy USA, and are guaranteed by certain 100% owned subsidiaries that guarantee our credit facilities. The indenture governing the 2023 Senior Notes contains restrictive covenants that limit, among other things, the ability of Murphy USA, Murphy Oil USA, Inc. and the restricted subsidiaries to incur additional indebtedness or liens, dispose of assets, make certain restricted payments or investments, enter into transactions with affiliates or merge with or into other entities. On April 25, 2017, Murphy Oil USA, Inc., issued $300 million of 5.625% Senior Notes due 2027 (the "2027 Senior Notes") under its existing shelf registration statement. The 2027 Senior Notes are fully and unconditionally guaranteed by Murphy USA, and are guaranteed by certain 100% owned subsidiaries that guarantee our credit facilities. The indenture governing the 2027 Senior Notes contains restrictive covenants that are essentially identical to the covenants for the 2023 Senior Notes. The 2023 and 2027 Senior Notes and the guarantees rank equally with all of our and the guarantors’ existing and future senior unsecured indebtedness and effectively junior to our and the guarantors’ existing and future secured indebtedness (including indebtedness with respect to the credit facilities) to the extent of the value of the assets securing such indebtedness. The 2023 and 2027 Senior Notes are structurally subordinated to all of the existing and future third-party liabilities, including trade payables, of our existing and future subsidiaries that do not guarantee the notes. Credit Facilities and Term Loan On August 30, 2013, we entered into a credit agreement, which provides for a committed $450 million asset-based loan (ABL) facility (with availability subject to the borrowing base described below) and a $150 million term facility. It also provided for a $200 million uncommitted incremental facility. On September 2, 2014, we amended the credit agreement to extend the maturity date to September 2, 2019 and amend the terms of the various covenants. On March 10, 2016, we amended the agreement to extend the effective date of the ABL to March 10, 2021 , added a $200 million term loan facility that was immediately drawn down and is due on March 10, 2020 and requires quarterly principal payments of $10 million that began July 1, 2016 (now $5 million per quarter), and reduced the uncommitted incremental facility to $150 million . The borrowing base is expected, at any time of determination, to be an amount (net of reserves) equal to the sum of: • 100% of eligible cash at such time, plus • 90% of eligible credit card receivables at such time, plus • 90% of eligible investment grade accounts, plus • 85% of eligible other accounts, plus • 80% of eligible product supply/wholesale refined products inventory at such time, plus • 75% of eligible retail refined products inventory at such time, plus the lesser of (i) 70% of the average cost of eligible retail merchandise inventory at such time and (ii) 85% of the net orderly liquidation value of eligible retail merchandise inventory at such time. The ABL facility includes a $200 million sublimit for the issuance of letters of credit. Letters of credit issued under the ABL facility reduce availability under the ABL facility. Interest payable on the credit facilities is based on either: • the London interbank offered rate, adjusted for statutory reserve requirements (the “Adjusted LIBO Rate”); or • the Alternate Base Rate, which is defined as the highest of (a) the prime rate, (b) the federal funds effective rate from time to time plus 0.50% per annum and (c) the one-month Adjusted LIBO Rate plus 1.00% per annum, plus, (A) in the case Adjusted LIBO Rate borrowings, (i) with respect to the ABL facility, spreads ranging from 1.50% to 2.00% per annum depending on a total debt to EBITDA ratio under the ABL facility or (ii) with respect to the term facility, spreads ranging from 2.50% to 2.75% per annum depending on a total debt to EBITDA ratio and (B) in the case of Alternate Base Rate borrowings, (i) with respect to the ABL facility, spreads ranging from 0.50% to 1.00% per annum depending on a total debt to EBITDA ratio under the ABL facility or (ii) with respect to the term facility, spreads ranging from 1.50% to 1.75% per annum depending on a total debt to EBITDA ratio. The interest rate period with respect to the Adjusted LIBO Rate interest rate option can be set at one -, two -, three -, or six -months as selected by us in accordance with the terms of the credit agreement. The credit agreement contains certain covenants that limit, among other things, the ability of us and our subsidiaries to incur additional indebtedness or liens, to make certain investments, to enter into sale-leaseback transactions, to make certain restricted payments, to enter into consolidations, mergers or sales of material assets and other fundamental changes, to transact with affiliates, to enter into agreements restricting the ability of subsidiaries to incur liens or pay dividends, or to make certain accounting changes. In addition, the credit agreement requires us to maintain a minimum fixed charge coverage ratio of a minimum of 1.0 to 1.0 when availability for at least three consecutive business days is less than the greater of (a) 17.5% of the lesser of the aggregate ABL facility commitments and the borrowing base and (b) $70,000,000 (including as of the most recent fiscal quarter end on the first date when availability is less than such amount) as well as a maximum secured debt to EBITDA ratio of 4.5 to 1.0 at any time when term facility commitments or term loans thereunder are outstanding. As of December 31, 2017 , our fixed charge coverage ratio was 0.67 ; however, we had no debt outstanding under the facility at that date so the fixed charge coverage ratio currently has no impact on our operations or liquidity. Our secured debt to EBITDA ratio as of December 31, 2017 was 0.23 to 1.0. The credit agreement contains restrictions on certain payments, including dividends, when availability under the credit agreement is less than or equal to the greater of $100 million and 25% of the lesser of the revolving commitments and the borrowing base and our fixed charge coverage ratio is less than 1.0 to 1.0 (unless availability under the credit agreement is greater than $100 million and 40% of the lesser of the revolving commitments and the borrowing base). As of December 31, 2017 , our ability to make restricted payments was not limited as our availability under the borrowing base was more than $100.0 million , while our fixed charge coverage ratio was less than 1.0 to 1.0. As of December 31, 2017, the Company had a shortfall of approximately $206.9 million of our net income and retained earnings subject to such restrictions before the fixed charge coverage ratio under our credit agreement would exceed 1.0 to 1.0. All obligations under the credit agreement are guaranteed by Murphy USA and the subsidiary guarantors party thereto, and all obligations under the credit agreement, including the guarantees of those obligations, are secured by certain assets of Murphy USA, Murphy Oil USA, Inc. and the guarantors party thereto.

Asset Retirement Obligations (A

Asset Retirement Obligations (ARO)	12 Months Ended
	Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations (ARO)	Asset Retirement Obligations (ARO) The majority of the ARO recognized by the Company at December 31, 2017 and 2016 related to the estimated costs to dismantle and abandon certain of its retail gasoline stations. The Company has not recorded an ARO for certain of its marketing assets because sufficient information is presently not available to estimate a range of potential settlement dates for the obligation. These assets are consistently being upgraded and are expected to be operational into the foreseeable future. In these cases, the obligation will be initially recognized in the period in which sufficient information exists to estimate the obligation. A reconciliation of the beginning and ending aggregate carrying amount of the ARO is shown in the following table. December 31, (Thousands of dollars) 2017 2016 Balance at beginning of period $ 26,200 $ 24,345 Accretion expense 1,785 1,650 Settlements of liabilities (277 ) (174 ) Liabilities incurred 451 379 Balance at end of period $ 28,159 $ 26,200 The estimation of future ARO is based on a number of assumptions requiring professional judgment. The Company cannot predict the type of revisions to these assumptions that may be required in future periods due to the lack of availability of additional information.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The components of income from continuing operations before income taxes for each of the three years ended December 31, 2017 and income tax expense (benefit) attributable thereto were as follows: Years Ended December 31, (Thousands of dollars) 2017 2016 2015 Income (loss) from continuing operations before income taxes $ 240,022 $ 352,031 $ 218,289 Income tax expense (benefit) Federal - Current $ 39,147 74,932 58,039 Federal - Deferred (50,714 ) 38,807 15,853 State - Current and deferred 6,325 16,800 6,806 Total $ (5,242 ) $ 130,539 $ 80,698 The following table reconciles income taxes based on the U.S. statutory tax rate to the Company’s income tax expense (benefit). Years Ended December 31, (Thousands of dollars) 2017 2016 2015 Income tax expense based on the U.S. statutory tax rate $ 84,008 $ 123,211 $ 76,401 State income taxes, net of federal benefit 2,976 11,438 4,424 Effect of U.S. tax law change (88,927 ) — — Other, net (3,299 ) (4,110 ) (127 ) Total $ (5,242 ) $ 130,539 $ 80,698 An analysis of the Company’s deferred tax assets and deferred tax liabilities at December 31, 2017 and 2016 showing the tax effects of significant temporary differences is as follows: December 31, (Thousands of dollars) 2017 2016 Deferred tax assets Property costs and asset retirement obligations $ 2,833 $ 4,059 Employee benefits 4,382 10,742 Other deferred tax assets 3,436 7,623 Total gross deferred tax assets 10,651 22,424 Less valuation allowance — — Net deferred tax assets 10,651 22,424 Deferred tax liabilities Accumulated depreciation and amortization (142,081 ) (197,727 ) State deferred taxes (18,944 ) (18,643 ) Other deferred tax liabilities (3,871 ) (10,710 ) Total gross deferred tax liabilities (164,896 ) (227,080 ) Net deferred tax liabilities $ (154,245 ) $ (204,656 ) In management’s judgment, the net deferred tax assets in the preceding table will more likely than not be realized as reductions of future taxable income or by utilizing available tax planning strategies. In December 2017, the Tax Cuts and Jobs Act ("the Act") was enacted, which made major changes to the Federal income tax system for corporations and individuals. Two key corporate provisions of the Act that impacted the Company in 2017 were the reduction of the Federal corporate income tax rate from 35% to 21% and the increase of Federal bonus depreciation from 50% to 100% on certain qualifying assets retroactive to September 27, 2017. As a result, the Company has calculated its best estimate of the impact of the Act in its year-end income tax provision in accordance with its understanding of the Act and guidance available as of the date of the filing and as a result has recorded $88.9 million as a tax benefit in the fourth quarter of 2017, the period in which the legislation was enacted. The provisional amount relates primarily to the remeasurement of certain deferred tax assets and liabilities based on the rates of which they are expected to reverse in the future. In conjunction with the effectiveness of the Act, the SEC issued Staff Accounting Bulletin No. 118 ("SAB 118") to address the implications of U.S. GAAP in situations where the registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the Act. In accordance with SAB 118, the Company made its best estimate and has recorded provisional amounts related to certain equity and fixed asset temporary differences based on available information as of December 31, 2017. Additional work is necessary to finalize these amounts and any subsequent adjustments will be recorded as a component of tax expense in the 2018 quarter in which the analysis is completed. Murphy Oil’s tax returns in multiple jurisdictions that include the Company are subject to audit by taxing authorities. These audits often take years to complete and settle. As of December 31, 2017 , the earliest year remaining open for Federal audit and/or settlement is 2017 and for the states it ranges from 2012 - 2016 . Although the Company believes that recorded liabilities for unsettled issues are adequate, additional gains or losses could occur in future periods from resolution of outstanding unsettled matters. The FASB’s rules for accounting for income tax uncertainties clarify the criteria for recognizing uncertain income tax benefits and require additional disclosures about uncertain tax positions. Under U.S. GAAP the financial statement recognition of the benefit for a tax position is dependent upon the benefit being more likely than not to be sustainable upon audit by the applicable taxing authority. If this threshold is met, the tax benefit is then measured and recognized at the largest amount that is greater than 50 percent likely of being realized upon ultimate settlement. Liabilities associated with uncertain income tax positions are included in Deferred Credits and Other Liabilities in the Consolidated Balance Sheets. A reconciliation of the beginning and ending amount of the consolidated liability for unrecognized income tax benefits during the year ended December 31, 2017 and 2016 is shown in the following table. Year Ended December 31, (Thousands of dollars) 2017 2016 Balance at January 1 $ 7,874 $ 5,450 Additions for tax positions related to prior years 4,406 3,771 Additions for tax positions related to current year — — Settlements with taxing authorities (5,451 ) — Expiration of statutes of limitation (2,391 ) (1,347 ) Balance at December 31 $ 4,438 $ 7,874 All additions or reductions to the above liability affect the Company’s effective tax rate in the respective period of change. The Company accounts for any applicable interest and penalties on uncertain tax positions as a component of income tax expense. Income tax expense for the years ended December 31, 2017 , 2016 and 2015 included interest and penalties of $0.4 million , $1.5 million and $0.7 million , respectively, associated with uncertain tax positions. During the next twelve months, the Company currently expects to add immaterial amounts to the liability for uncertain taxes for 2018 events. Although existing liabilities could be reduced by settlement with taxing authorities or lapse due to statute of limitations, the Company believes that the changes in its unrecognized tax benefits due to these events will not have a material impact on the Consolidated Income Statement during 2018 . We adopted ASU 2016-09 on January 1, 2017, which requires the excess tax benefits or deficiencies to be reflected in the Consolidated Statements of Income as a component of the provision for income taxes whereas they previously were recognized in paid-in-capital. Total excess tax benefits recognized in the twelve months ended December 31, 2017 was $ 2.2 million .

Incentive Plans

Incentive Plans	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Incentive Plans	Incentive Plans Prior to the separation, our employees participated in the Murphy Oil 2007 Long-Term Incentive Plan (the “2007 Plan”) and the Murphy Oil 2012 Long-Term Incentive Plan (the “2012 Plan”) and received Murphy Oil restricted stock awards and options to purchase shares of Murphy Oil common stock. While participating in these two plans, costs resulting from share-based payment transactions were allocated and recognized as an expense in the financial statements using a fair value-based measurement method over the periods that the awards vested. 2013 Long-Term Incentive Plan Effective August 30, 2013, certain of our employees began to participate in the Murphy USA 2013 Long-Term Incentive Plan, which was subsequently amended and restated effective as of February 12, 2014 (the “MUSA 2013 Plan”). The MUSA 2013 Plan authorizes the Executive Compensation Committee of our Board of Directors (“the Committee”) to grant non-qualified or incentive stock options, stock appreciation rights, stock awards (including restricted stock and restricted stock unit awards), cash awards, and performance awards to our employees. Prior to the amendment and restatement of the MUSA 2013 Plan on February 12, 2014, 10 million shares of MUSA common stock were authorized to be delivered under the MUSA 2013 Plan over the life of the plan. Pursuant to the amendment and restatement of the plan effective as of February 12, 2014, this was reduced to 5.5 million shares of common stock. No more than 1 million shares of common stock may be awarded to any one employee, subject to adjustment for changes in capitalization. The maximum cash amount payable pursuant to any “performance-based” award to any participant in any calendar year is $5 million . In connection with the separation, stock compensation awards granted under the 2007 Plan and the 2012 Plan by Murphy Oil (pre-separation awards) were adjusted or substituted as follows: • Vested stock options were equitably adjusted so that the grantee holds more options to purchase Murphy Oil common stock at a lower strike price. • Unvested stock options and stock appreciation rights held by MUSA employees were replaced with substitute awards of options to purchase shares of MUSA common stock. • Unvested restricted stock units will be replaced with adjusted, substitute awards for restricted stock units of MUSA common stock. The new awards of restricted stock are intended to generally preserve the intrinsic value of the original award determined as of the separation and distribution date. • Vesting periods of awards were unaffected by the adjustment and substitution, except that for vested Murphy Oil stock options the MUSA employees have until the earlier of two years from the date of the separation or the stated expiration date of the option to exercise the award. Awards granted in connection with the adjustment and substitution of awards originally issued under the 2007 Plan and the 2012 Plan are a part of the MUSA 2013 Plan and reduce the maximum number of shares of common stock available for delivery under the MUSA 2013 Plan. During the period from August 30, 2013 to December 31, 2017 , the Company granted a total of 1,878,065 awards from the MUSA 2013 Plan which leaves 3,621,935 remaining shares to be granted in future years (after consideration of the amendments made to the MUSA 2013 Plan in February 2014 by the Board of Directors). At present, the Company expects to issue all shares that vest out of existing treasury shares rather than issuing new common shares. 2013 Stock Plan for Non-employee Directors Effective August 8, 2013, Murphy USA adopted the 2013 Murphy USA Stock Plan for Non-employee Directors (the “Directors Plan”). The directors for Murphy USA are compensated with a mixture of cash payments and equity-based awards. Awards under the Directors Plan may be in the form of restricted stock, restricted stock units, stock options, or a combination thereof. An aggregate of 500,000 shares of common stock shall be available for issuance of grants under the Directors Plan. Since 2013, 99,622 time-based restricted stock units have been granted under the terms of the Directors Plan which leaves 400,378 shares available to be granted in the future. Amounts recognized in the financial statements by the Company with respect to all share-based plans are shown in the following table. All expense prior to August 30, 2013 was incurred under the 2007 Plan and the 2012 Plan while all amounts after August 30, 2013 were incurred in the MUSA 2013 Plan and the Directors Plan. December 31, (Thousands of dollars) 2017 2016 2015 Compensation charged against income before income tax benefit $ 7,495 $ 9,314 $ 9,015 Related income tax benefit recognized in income $ 2,623 $ 3,259 $ 3,155 As of December 31, 2017 , there was $14.7 million in compensation costs to be expensed over approximately the next 1.8 years related to unvested share-based compensation arrangements granted by the Company. Employees who have stock options are required to net settle their options in shares, after applicable statutory withholding taxes are considered, upon each stock option exercise. Therefore, no cash is received upon exercise. Total income tax benefits realized from tax deductions related to stock option exercises under share-based payment arrangements were $0.6 million , $1.6 million , and $3.1 million for the years ended December 31, 2017 , 2016 , and 2015 , respectively. STOCK OPTIONS – The Committee fixes the option price of each option granted at no less than fair market value (FMV) on the date of the grant and fixes the option term at no more than 7 years from such date. Each option granted through December 31, 2013 under the MUSA 2013 Plan was nonqualified and was issued to replace awards of Murphy Oil that were previously granted to employees of the Company prior to the separation from Murphy Oil. The remaining term of each option granted mirrored the remaining term of the original award that it replaced and the exercise price was adjusted based on the terms of the Employee Matters Agreement entered into between the Company and Murphy Oil in connection with the separation. Post separation in 2013, the only awards issued were to replace the unvested awards of Murphy Oil that were forfeited in conjunction with the separation. Therefore, the accounting for those awards was a continuation of the Murphy Oil fair value that was previously calculated using the Black-Scholes pricing model and used the following original assumptions to calculate the fair value used for expense purposes. Following are the assumptions used originally by Murphy Oil to value the original awards. Years Ended December 31, 2012 and 2011 Fair value per option grant 12.37 - 20.34 Assumptions Dividend yield 1.80% - 2.27% Expected volatility 37.00% - 39.62% Risk-free interest rate 0.55% - 2.10% Expected life 4.00 yrs. - 5.20 yrs. As a result of the separation from Murphy Oil, the unvested Murphy Oil options were replaced with an appropriate number of Company options bearing an exercise price that was adjusted to preserve the intrinsic value near the date of the separation in connection with the terms of the Employee Matters Agreement. The grant date fair values of the options replaced with MUSA 2013 Plan awards ranged from $32.53 to $40.25 . Because of these adjustments, no further Black-Scholes fair values were required to be calculated for the post separation period. The adjustment and substitution of the stock compensation awards occurred in conjunction with the distribution of MUSA common stock to Murphy Oil stockholders. As a result, no grant, exercise, or cancellation activity occurred on MUSA stock compensation awards during the year ended December 31, 2013. In February 2017 , the Committee granted nonqualified stock options to certain employees of the Company. Following are the assumptions used by the Company to value the original awards: Year Ended December 31, 2017 2016 2015 Fair value per option grant $ 15.45 $ 16.08 $ 20.18 Assumptions Dividend yield — — — Expected volatility 26.0 % 26.1 % 29.3 % Risk-free interest rate 1.65 % 1.26 % 1.52 % Expected life 4.2 years 5.7 years 5.0 years Changes in options outstanding for Company employees during the period from December 31, 2014 to December 31, 2017 are presented in the following table: Number of Shares Average Exercise Price Outstanding at December 31, 2014 660,635 $ 36.00 Granted at FMV 72,350 70.57 Vested and issued (236,620 ) 33.80 Forfeited (30,609 ) 40.21 Outstanding at December 31, 2015 465,756 42.22 Granted at FMV 96,500 59.11 Exercised (126,969 ) 34.48 Forfeited (14,350 ) 58.28 Outstanding at December 31, 2016 420,937 47.88 Granted at FMV 114,800 65.75 Exercised (43,887 ) 37.41 Forfeited (25,950 ) 63.63 Outstanding at December 31, 2017 465,900 $ 52.39 Exercisable at December 31, 2015 127,077 $ 36.71 Exercisable at December 31, 2016 218,937 $ 38.32 Exercisable at December 31, 2017 254,375 $ 42.80 Additional information about stock options outstanding at December 31, 2017 is shown below: Options Outstanding Options Exercisable Range of Exercise Prices per Option No. of Options Avg. Life Remaining in Years Aggregate Intrinsic Value No. of Options Avg. Life Remaining in Years Aggregate Intrinsic Value $32.53 to $37.06 32,687 1.8 $ 1,518,763 32,687 1.8 $ 1,518,763 $37.07 to $39.45 264 0.1 11,428 264 0.1 11,428 $39.46 to $40.25 191,249 2.5 7,727,937 191,249 2.5 7,727,937 $40.26 to $70.57 241,700 5.3 3,773,099 30,175 3.9 295,413 465,900 3.9 $ 13,031,227 254,375 2.6 $ 9,553,541 RESTRICTED STOCK UNITS (MUSA 2013 Plan) – The Committee has granted time based restricted stock units (RSUs) as part of the compensation plan for its executives and certain other employees since its inception. In 2017 , the Committee granted time based restricted stock to a group of employees. These awards were granted under the MUSA 2013 Plan and vest over 3 years . (Number of units) Employee RSU's Outstanding at December 31, 2014 397,015 Granted at FMV 55,450 Vested and issued (66,116 ) Forfeited (30,049 ) Outstanding at December 31, 2015 356,300 Granted 74,325 Vested and issued (142,392 ) Forfeited (18,888 ) Outstanding at December 31, 2016 269,345 Granted 111,471 Vested and issued (60,688 ) Forfeited (61,112 ) Outstanding at December 31, 2017 259,016 PERFORMANCE-BASED RESTRICTED STOCK UNITS (MUSA 2013 Plan) – In February 2017 , the Committee awarded performance-based restricted stock units (performance units) to certain employees. Half of the performance units vest based on a 3 -year return on average capital employed (ROACE) calculation and the other half vest based on a 3 -year total shareholder return (TSR) calculation that compares MUSA to a group of 16 peer companies. The portion of the awards that vest based on TSR qualify as a market condition and must be valued using a Monte Carlo valuation model. For the TSR portion of the awards, the fair value was determined to be $94.51 per unit. For the ROACE portion of the awards, the valuation was based on the grant date fair value of $65.75 per unit and the number of awards will be periodically assessed to determine the probability of vesting. (Number of units) Employee PSU's Outstanding at December 31, 2014 72,000 Granted 40,400 Vested and issued — Forfeited (10,006 ) Outstanding at December 31, 2015 102,394 Granted 53,300 Vested and issued — Forfeited (7,954 ) Outstanding at December 31, 2016 147,740 Granted 53,800 Vested and issued (60,816 ) Forfeited (16,000 ) Outstanding at December 31, 2017 124,724 RESTRICTED STOCK UNITS (Directors Plan) – The Committee has also granted time based RSUs to the non-employee directors of the Company as part of their overall compensation package for being a member of the Board of Directors. These awards typically vest at the end of three years . (Number of units) Director RSU's Outstanding at December 31, 2014 50,850 Granted 12,924 Vested and issued — Forfeited — Outstanding at December 31, 2015 63,774 Granted 19,900 Vested and issued (34,332 ) Forfeited — Outstanding at December 31, 2016 49,342 Granted 15,948 Vested and issued (19,944 ) Forfeited — Outstanding at December 31, 2017 45,346

Employee and Retiree Benefit Pl

Employee and Retiree Benefit Plans	12 Months Ended
	Dec. 31, 2017
Retirement Benefits [Abstract]
Employee and Retiree Benefit Plans	Employee and Retiree Benefit Plans THRIFT PLAN – At the time of the spin-off, Murphy USA set up a new qualified defined contribution plan for full-time employees with an asset transfer from the Murphy Oil defined contribution plan. Most full-time employees of the Company may participate in savings plans by contributing up to a specified percentage of their base pay. The Company matches contributions at 100% of each employee’s contribution with a maximum match of 6% . In addition, the Company makes profit sharing contributions on an annual basis. Eligible employees receive a stated percentage of their base and incentive pay of 5% , 7% , or 9% determined on a formula that is based on a combination of age and years of service. The Company’s combined expenses related for this plan were $12.1 million in 2017 , $10.5 million in 2016 and $9.2 million in 2015 . PROFIT SHARING PLAN – Eligible part-time employees may participate in the Company’s noncontributory profit sharing plan. Each year, the Company may make a discretionary employer contribution in an amount determined and authorized at the discretion of the Board of Directors. Eligible employees receive an allocation based on their compensation earned for the year the contribution is allocated. The Company’s expenses related to this plan were $2.2 million in 2017 , $1.8 million in 2016 and $1.8 million in 2015 .

Financial Instruments and Risk

Financial Instruments and Risk Management	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Instruments and Risk Management	Financial Instruments and Risk Management DERIVATIVE INSTRUMENTS — The Company makes limited use of derivative instruments to manage certain risks related to commodity prices. The use of derivative instruments for risk management is covered by operating policies and is closely monitored by the Company’s senior management. The Company does not hold any derivatives for speculative purposes and it does not use derivatives with leveraged or complex features. Derivative instruments are traded primarily with creditworthy major financial institutions or over national exchanges such as the New York Mercantile Exchange (“NYMEX”). As of December 31, 2017 , all current derivative activity is immaterial. At December 31, 2017 and 2016 cash deposits of $2.7 million and $1.8 million , respectively, related to commodity derivative contracts were reported in Prepaid expenses and other current assets in the Consolidated Balance Sheets. These cash deposits have not been used to reduce the reported net liabilities on the derivative contracts at December 31, 2017 and 2016 .

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Basic earnings per common share is computed by dividing net income available to common stockholders by the weighted average of common shares outstanding during the period. Diluted earnings per common share adjusts basic earnings per common share for the effects of stock options and restricted stock in the periods where such items are dilutive. On August 30, 2013, 46,743,316 shares of our common stock were distributed to the shareholders of Murphy Oil in connection with the separation. For comparative purposes, we have assumed this amount to be outstanding as of the beginning of each prior period prior to the separation presented in the calculation of weighted average shares outstanding. During May 2014, the Company authorized a share repurchase program that was approved by the Board of Directors for approximately $50 million worth of common stock of the Company. At the completion of this program, the Company had acquired 1,040,636 shares of common stock for an average price of $48.07 per share including brokerage fees. In October 2014, the Company announced a $250 million share repurchase program that was completed prior to the end of 2015. In this repurchase, 4,196,349 shares were repurchased for an average price of $59.58 per share. On January 25, 2016, the Company announced that it would proceed with an independent growth plan in which we will concentrate on acquiring land from third parties rather than acquiring land directly from Walmart. In conjunction with this announcement, the Board of Directors approved a strategic allocation of capital for the Company to pursue new additional growth opportunities and to undertake a share repurchase program of the Company's common stock. The Board authorized up to $500 million in total for the two capital programs through December 31, 2017. For the years ended December 31, 2017 and 2016 , the Company acquired 2,586,190 and 4,903,198 shares of common stock for an average price of $68.34 and $65.93 , respectively, per share including brokerage fees which included completion of the $500 million repurchase program. Based on market conditions and other factors, the Company repurchased an additional 379,054 common shares for $29 million , with an average price of $77.20 , during the fourth quarter of 2017. The following table provides a reconciliation of basic and diluted earnings per share computations for the years ended December 31, 2017 , 2016 and 2015 (in thousands, except per share amounts): Years ended December 31, (Thousands of dollars except per share amounts) 2017 2016 2015 Earnings per common share: Net income per share - basic Income from continuing operations $ 245,264 $ 221,492 $ 137,591 Income from discontinued operations $ — $ — $ 38,749 Net income attributable to common stockholders $ 245,264 $ 221,492 $ 176,340 Weighted average common shares outstanding (in thousands) 35,816 39,269 43,434 Earnings per share: Continuing operations $ 6.85 $ 5.64 $ 3.17 Discontinued operations $ — $ — $ 0.89 Total earnings per share $ 6.85 $ 5.64 $ 4.06 Earnings per common share - assuming dilution: Years ended December 31, 2017 2016 2015 Net income per share - diluted Income from continuing operations $ 245,264 $ 221,492 $ 137,591 Income from discontinued operations $ — $ — $ 38,749 Net income attributable to common stockholders $ 245,264 $ 221,492 $ 176,340 Weighted average common shares outstanding (in thousands) 35,816 39,269 43,434 Common equivalent shares: Share-based awards 340 377 360 Weighted average common shares outstanding - assuming dilution (in thousands) 36,156 39,646 43,794 Earnings per share: Continuing operations $ 6.78 $ 5.59 $ 3.14 Discontinued operations $ — $ — $ 0.88 Earnings per share - assuming dilution $ 6.78 $ 5.59 $ 4.02 We have excluded from the earnings-per-share calculation certain stock options and shares that are considered to be anti-dilutive under the treasury stock method. For the reported periods, the number of time-based restrictive stock units, performance based units and non-qualified stock options that are excluded due to their anti-dilutive nature is immaterial.

Other Financial Information

Other Financial Information	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Other Financial Information	Other Financial Information OTHER OPERATING REVENUES – Other operating revenues in the Consolidated Income Statements includes the following items: (Thousands of dollars) 2017 2016 2015 Renewable Identification Numbers (RINs) sales $ 160,279 $ 181,138 $ 117,513 Other 5,760 4,206 3,321 Total other operating revenue $ 166,039 $ 185,344 $ 120,834 CASH FLOW DISCLOSURES — Cash income taxes paid (collected), net of refunds, were $51.7 million , $70.8 million and $113.5 million for the three years ended December 31, 2017 , 2016 and 2015 , respectively. Interest paid, net of amounts capitalized, was $41.5 million , $37.1 million and $31.8 million for the years ended December 31, 2017 , 2016 and 2015 , respectively. CHANGES IN WORKING CAPITAL - (Thousands of dollars) 2017 2016 2015 Accounts receivable $ (41,673 ) $ (47,203 ) $ 2,857 Inventories (16,344 ) 2,143 1,121 Prepaid expenses and other current assets (5,184 ) 13,705 (27,107 ) Accounts payable and accrued liabilities 26,841 83,384 1,043 Income taxes payable (594 ) 1,697 (25,599 ) Current deferred income tax liabilities — — 1,099 Net decrease (increase) in noncash operating working capital $ (36,954 ) $ 53,726 $ (46,586 )

Assets and Liabilities Measure

Assets and Liabilities Measure at Fair Value	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Assets and Liabilities Measure at Fair Value	Assets and Liabilities Measured at Fair Value The Company carries certain assets and liabilities at fair value in its Consolidated Balance Sheets. The fair value hierarchy is based on the quality of inputs used to measure fair value, with Level 1 being the highest quality and Level 3 being the lowest quality. Level 1 inputs are quoted prices in active markets for identical assets or liabilities. Level 2 inputs are observable inputs other than quoted prices included within Level 1. Level 3 inputs are unobservable inputs which reflect assumptions about pricing by market participants. At the balance sheet date, the fair value of derivatives contracts was determined using NYMEX quoted values but were immaterial. The carrying value of the Company’s Cash and cash equivalents, Accounts receivable-trade, and Trade accounts payable and accrued liabilities approximates fair value. The following table presents the carrying amounts and estimated fair values of financial instruments held by the Company at December 31, 2017 and 2016 . The fair value of a financial instrument is the amount at which the instrument could be exchanged in a current transaction between willing parties. The table excludes Cash and cash equivalents, Accounts receivable-trade, and Trade accounts payable and accrued liabilities, all of which had fair values approximating carrying amounts. The fair value of Current and Long-term debt was estimated based on rates offered to the Company at that time for debt of the same maturities. The Company has off-balance sheet exposures relating to certain financial guarantees and letters of credit. The fair value of these, which represents fees associated with obtaining the instruments, was nominal. December 31, 2017 December 31, 2016 Carrying Carrying (Thousands of dollars) Amount Fair Value Amount Fair Value Financial liabilities Current and long-term debt $ (880,751 ) $ (904,931 ) $ (670,218 ) $ (690,114 )

Commitments

Commitments	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments	Commitments The Company leases land, gasoline stations, and other facilities under operating leases. During the next five years, expected future rental payments under all operating leases are approximately $12.3 million in 2018 , $11.9 million in 2019 , $11.7 million in 2020 , $11.5 million in 2021 , and $11.0 million in 2022 . Rental expense for noncancelable operating leases, including contingent payments when applicable, was $14.0 million in 2017 , $23.2 million in 2016 and $22.4 million in 2015 . Operating lease expense related to discontinued operations was $2.7 million in 2015 . Commitments for capital expenditures were approximately $180.8 million at December 31, 2017 , including $158.8 million for construction of future Murphy USA and Murphy Express gasoline stations (including land) in process at year-end, along with $9.8 million for improvements of existing stations, to be financed with our operating cash flow and/or incurrence of indebtedness. The Company has certain take-or-pay contracts primarily to supply our waterborne terminals with a noncancelable remaining term of one year . At December 31, 2017 , our minimum annual payments under our take-or-pay contracts are estimated to be $9.5 million in 2018 . To estimate our annual commitments under this supply arrangement, we applied Argus posted pricing as of December 31, 2017 on the refined product mix to be delivered under the contract's minimum purchase requirements.

Contingencies

Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies The Company’s operations and earnings have been and may be affected by various forms of governmental action. Examples of such governmental action include, but are by no means limited to: tax increases and retroactive tax claims; import and export controls; price controls; allocation of supplies of crude oil and petroleum products and other goods; laws and regulations intended for the promotion of safety and the protection and/or remediation of the environment; governmental support for other forms of energy; and laws and regulations affecting the Company’s relationships with employees, suppliers, customers, stockholders and others. Because governmental actions are often motivated by political considerations, may be taken without full consideration of their consequences, and may be taken in response to actions of other governments, it is not practical to attempt to predict the likelihood of such actions, the form the actions may take or the effect such actions may have on the Company. ENVIRONMENTAL MATTERS AND LEGAL MATTERS — Murphy USA is subject to numerous federal, state and local laws and regulations dealing with the environment. Violation of such environmental laws, regulations and permits can result in the imposition of significant civil and criminal penalties, injunctions and other sanctions. A discharge of hazardous substances into the environment could, to the extent such event is not insured, subject the Company to substantial expense, including both the cost to comply with applicable regulations and claims by neighboring landowners and other third parties for any personal injury, property damage and other losses that might result. The Company currently owns or leases, and has in the past owned or leased, properties at which hazardous substances have been or are being handled. Although the Company believes it has used operating and disposal practices that were standard in the industry at the time, hazardous substances may have been disposed of or released on or under the properties owned or leased by the Company or on or under other locations where they have been taken for disposal. In addition, many of these properties have been operated by third parties whose management of hazardous substances was not under the Company’s control. Under existing laws, the Company could be required to remediate contaminated property (including contaminated groundwater) or to perform remedial actions to prevent future contamination. Certain of these contaminated properties are in various stages of negotiation, investigation, and/or cleanup, and the Company is investigating the extent of any related liability and the availability of applicable defenses. With the sale of the U.S. refineries in 2011, Murphy Oil retained certain liabilities related to environmental matters. Murphy Oil also obtained insurance covering certain levels of environmental exposures. With respect to the previously owned refinery properties, Murphy Oil retained those liabilities in the Separation and Distribution agreement that was entered into related to the separation on August 30, 2013. With respect to any remaining potential liabilities, the Company believes costs related to these sites will not have a material adverse effect on Murphy USA’s net income, financial position or liquidity in a future period. Certain environmental expenditures are likely to be recovered by the Company from other sources, primarily environmental funds maintained by certain states. Since no assurance can be given that future recoveries from other sources will occur, the Company has not recorded a benefit for likely recoveries at December 31, 2017 , however certain jurisdictions provide reimbursement for these expenses which have been considered in recording the net exposure. The U.S. Environmental Protection Agency (EPA) currently considers the Company a Potentially Responsible Party (PRP) at one Superfund site. As to the site, the potential total cost to all parties to perform necessary remedial work at this site may be substantial. However, based on current negotiations and available information, the Company believes that it is a de minimis party as to ultimate responsibility at the Superfund site. Accordingly, the Company has not recorded a liability for remedial costs at the Superfund site at December 31, 2017 . The Company could be required to bear a pro rata share of costs attributable to nonparticipating PRPs or could be assigned additional responsibility for remediation at this site or other Superfund sites. The Company believes that its share of the ultimate costs to clean-up this site will be immaterial and will not have a material adverse effect on its net income, financial position or liquidity in a future period. Based on information currently available to the Company, the amount of future remediation costs to be incurred to address known contamination sites is not expected to have a material adverse effect on the Company’s future net income, cash flows or liquidity. However, there is the possibility that additional environmental expenditures could be required to address contamination, including as a result of discovering additional contamination or the imposition of new or revised requirements applicable to known contamination. Murphy USA is engaged in a number of other legal proceedings, all of which the Company considers routine and incidental to its business. Based on information currently available to the Company, the ultimate resolution of those other legal matters is not expected to have a material adverse effect on the Company’s net income, financial condition or liquidity in a future period. The Company was contacted by the State of Mississippi to settle alleged violations of the state's Petroleum Underground Storage Tank system requirements at several of the Company's facilities. Based on discussions to date, the civil penalty is anticipated to be approximately $0.1 million . We are negotiating this matter with the state's Department of Environmental Quality in order to establish a consent agreement and resolve any allegations of non-compliance. We do not anticipate that the resolution of this matter will have a material impact on our results of operations or financial condition. INSURANCE — The Company maintains insurance coverage at levels that are customary and consistent with industry standards for companies of similar size. Murphy USA maintains statutory workers compensation insurance with a deductible of $1.0 million per occurrence, general liability insurance with a deductible of $3.0 million per occurrence, and auto liability insurance with a deductible of $0.3 million per occurrence. As of December 31, 2017 , there were a number of outstanding claims that are of a routine nature. The estimated incurred but unpaid liabilities relating to these claims are included in Trade account payables and accrued liabilities on the Consolidated Balance Sheets. While the ultimate outcome of these claims cannot presently be determined, management believes that the accrued liability of $19.5 million will be sufficient to cover the related liability and that the ultimate disposition of these claims will have no material effect on the Company’s financial position and results of operations. The Company has obtained insurance coverage as appropriate for the business in which it is engaged, but may incur losses that are not covered by insurance or reserves, in whole or in part, and such losses could adversely affect our results of operations and financial position. TAX MATTERS — Murphy USA is subject to extensive tax liabilities imposed by multiple jurisdictions, including income taxes, indirect taxes (excise/duty, sales/use and gross receipts taxes), payroll taxes, franchise taxes, withholding taxes and ad valorem taxes. New tax laws and regulations and changes in existing tax laws and regulations are continuously being enacted or proposed that could result in increased expenditures for tax liabilities in the future. Many of these liabilities are subject to periodic audits by the respective taxing authority. Subsequent changes to our tax liabilities because of these audits may subject us to interest and penalties. OTHER MATTERS — In the normal course of its business, the Company is required under certain contracts with various governmental authorities and others to provide financial guarantees or letters of credit that may be drawn upon if the Company fails to perform under those contracts. At December 31, 2017 , the Company had contingent liabilities of $15.4 million on outstanding letters of credit. The Company has not accrued a liability in its balance sheet related to these financial guarantees and letters of credit because it is believed that the likelihood of having these drawn is remote.

Recent Accounting and Reporting

Recent Accounting and Reporting Rules	12 Months Ended
	Dec. 31, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Accounting and Reporting Rules	Recent Accounting and Reporting Rules In May 2014, the FASB issued ASU No. 2014-09 “Revenue from Contracts with Customers,” which supersedes the revenue recognition requirements in the Accounting Standards Codification (“Codification”) Topic 605, Revenue Recognition, and most industry-specific guidance throughout the Industry Topics of the Codification. The core principle of the new ASU No. 2014-09 is for companies to recognize revenue from the transfer of goods or services to customers in amounts that reflect the consideration to which the company expects to be entitled in exchange for those goods or services. The Company will adopt ASU No. 2014-09 beginning January 1, 2018 using the modified retrospective approach applied to those contracts that were not completed at that date. Prior periods will not be retrospectively adjusted. The Company has completed its analysis to identify all revenue streams, and has determined the impact the ASU will have on these various revenue streams and the consolidated financial statements and believes that impact is immaterial. The Company has implemented new controls and processes to compliment the new guidance. The Company currently presents excise tax and other similar taxes collected on sales of refined products and remitted to governmental agencies on a gross basis, in both revenues and cost of petroleum products sold in the income statement. ASU 2014-09 requires the Company to either analyze each tax on a jurisdiction-by-jurisdiction basis to determine if it is the principal in the transaction and continue to present the tax on a gross basis or elect to report all taxes on a net basis. The Company will elect to assess all excise and other similar taxes on a jurisdiction-by-jurisdiction basis resulting in certain taxes to be presented on a net basis upon adoption of ASU 2014-09, thus reducing revenue in the income statement with no impact to net income or cash flows. The Company does not expect the impact on reported revenue for the year ended December 31, 2018 to be material. In February 2016, the FASB issued ASU No. 2016-02, "Leases (Topic 842)" (“ASU 2016-02”). ASU 2016-02 amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets. Lessor accounting will remain similar to lessor accounting under previous GAAP, while aligning with the FASB’s new revenue recognition guidance. ASU 2016-02 is effective for the Company beginning January 1, 2019. Early adoption of ASU 2016-02 is permitted. The standard requires a modified retrospective transition approach for all leases existing at, or entered into after, the date of initial application, with an option to use certain transition relief. While this ASU will have impact on our internal processes and controls and result in a change to our accounting, we are still in the evaluation and information gathering stage of implementing the guidance and cannot yet estimate the potential impact. In March 2016, the FASB issued ASU No. 2016-09, "Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting", which amends the current stock compensation guidance. The amendments simplify the accounting for the taxes related to stock based compensation, including adjustments to how excess tax benefits and a company’s payments for tax withholdings should be classified among other changes. The standard was effective for the Company on January 1, 2017. The primary impact of adoption for the twelve month period ended December 31, 2017 was the recognition of $2.2 million of excess tax benefits in the provision for income taxes rather than paid-in-capital for the current period. Additional amendments to the accounting for income taxes and minimum statutory withholding tax requirements had no impact to retained earnings as of January 1, 2017, where the cumulative effect of those changes is required to be recorded. The Company elected to continue to estimate forfeitures expected to occur to determine the amount of compensation cost to be recognized each period. The Company elected to apply the presentation requirements for cash flows related to excess tax benefits prospectively as of January 1, 2017. The presentation requirements for cash flows related to employee taxes paid for withheld shares had no impact to any of the periods presented on the consolidated statement of cash flows, as such cash flows have historically been presented as a financing activity.

Business Segments

Business Segments	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Business Segments	Business Segments Our operations include the sale of retail motor fuel products and convenience merchandise along with the wholesale and bulk sale capabilities of our product supply and wholesale group. As the primary purpose of the product supply and wholesale group is to support our retail operations and provide fuel for their daily operation, the bulk and wholesale fuel sales are secondary to the support functions played by these groups. As such, they are all treated as one segment for reporting purposes as they sell the same products. This Marketing segment contains essentially all of the revenue generating activities of the Company. Results not included in the reportable segment include Corporate and Other Assets and Discontinued Operations. The reportable segment was determined based on information reviewed by the Chief Operating Decision Maker (CODM). Segment Information Corporate and Discontinued (Thousands of dollars) Marketing Other Assets Operations Consolidated Year ended December 31, 2017 Segment income (loss) $ 295,322 (50,058 ) — $ 245,264 Revenues from external customers 12,826,228 325 — 12,826,553 Interest income — 1,309 — 1,309 Interest expense (83 ) (46,577 ) — (46,660 ) Income tax expense (benefit) (2,923 ) (2,319 ) — (5,242 ) Significant noncash charges (credits) Depreciation and amortization 110,530 6,436 — 116,966 Accretion of asset retirement obligations 1,785 — — 1,785 Deferred and noncurrent income taxes (benefits) (61,299 ) 10,888 — (50,411 ) Additions to property, plant and equipment 234,029 39,693 — 273,722 Total assets at year-end $ 2,023,376 307,663 — $ 2,331,039 Year ended December 31, 2016 Segment income (loss) $ 249,790 (28,298 ) — $ 221,492 Revenues from external customers 11,594,311 242 — 11,594,553 Interest income — 578 — 578 Interest expense (53 ) (39,651 ) — (39,704 ) Income tax expense (benefit) 147,217 (16,678 ) — 130,539 Significant noncash charges (credits) Depreciation and amortization 92,242 6,368 — 98,610 Accretion of asset retirement obligations 1,650 — — 1,650 Deferred and noncurrent income taxes (benefits) 51,290 (10,883 ) — 40,407 Additions to property, plant and equipment 239,095 24,761 — 263,856 Total assets at year-end $ 1,858,055 230,685 — $ 2,088,740 Year ended December 31, 2015 Segment income (loss) $ 159,796 (22,205 ) 38,749 $ 176,340 Revenues from external customers 12,699,124 287 — 12,699,411 Interest income — 2,177 — 2,177 Interest expense (20 ) (33,511 ) — (33,531 ) Income tax expense (benefit) 95,657 (14,959 ) — 80,698 Significant noncash charges (credits) Depreciation and amortization 81,349 5,219 — 86,568 Accretion of asset retirement obligations 1,521 — — 1,521 Deferred and noncurrent income taxes (benefits) 42,593 (2,037 ) — 40,556 Additions to property, plant and equipment 202,371 9,477 3,720 215,568 Total assets at year-end $ 1,727,131 159,110 — $ 1,886,241

Guarantor Subsidiaries

Guarantor Subsidiaries	12 Months Ended
	Dec. 31, 2017
Guarantor Subsidiaries [Abstract]
Guarantor Subsidiaries	Guarantor Subsidiaries Certain of the Company’s 100% owned, domestic subsidiaries (the “Guarantor Subsidiaries”) fully and unconditionally guarantee, on a joint and several basis, certain of the outstanding indebtedness of the Company, including the 6.00% senior notes due 2023 and the 5.625% senior notes due 2027. The following consolidating schedules present financial information on a consolidated basis in conformity with the SEC’s Regulation S-X Rule 3-10(d): CONSOLIDATING BALANCE SHEET (Thousands of dollars) December 31, 2017 Assets Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Current assets Cash and cash equivalents $ — $ 169,978 $ 50 $ — $ — $ 170,028 Accounts receivable—trade, less allowance for doubtful accounts of $1,094 in 2017 — 225,268 — — — 225,268 Inventories, at lower of cost or market — 182,477 — — — 182,477 Prepaid expenses and other current assets — 36,507 14 — — 36,521 Total current assets — 614,230 64 — — 614,294 Property, plant and equipment, at cost less accumulated depreciation and amortization of $874,675 in 2017 — 1,678,298 1,172 — — 1,679,470 Investments in subsidiaries 2,223,374 144,898 — — (2,368,272 ) — Other assets — 37,275 — — — 37,275 Total assets $ 2,223,374 $ 2,474,701 $ 1,236 $ — $ (2,368,272 ) $ 2,331,039 Liabilities and Stockholders' Equity Current liabilities Current maturities of long-term debt $ — $ 19,887 $ — $ — $ — $ 19,887 Inter-company accounts payable 829,202 (624,065 ) (50,799 ) (154,338 ) — — Trade accounts payable and accrued liabilities — 513,471 (7 ) — — 513,464 Income taxes payable — — — — — — Total current liabilities 829,202 (90,707 ) (50,806 ) (154,338 ) — 533,351 Long-term debt, including capitalized lease obligations — 860,864 — — — 860,864 Deferred income taxes — 154,245 — — — 154,245 Asset retirement obligations — 28,159 — — — 28,159 Deferred credits and other liabilities — 16,018 — — — 16,018 Total liabilities 829,202 968,579 (50,806 ) (154,338 ) — 1,592,637 Stockholders' Equity Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding) — — — — — — Common Stock, par $0.01 (authorized 200,000,000 shares, 46,767,164 shares issued at December 31, 2017) 468 1 60 — (61 ) 468 Treasury stock (12,675,630 shares held at December 31, 2017) (806,511 ) — — — — (806,511 ) Additional paid in capital (APIC) 1,205,680 573,065 52,004 87,543 (1,368,382 ) 549,910 Retained earnings 994,535 933,056 (22 ) 66,795 (999,829 ) 994,535 Total stockholders' equity 1,394,172 1,506,122 52,042 154,338 (2,368,272 ) 738,402 Total liabilities and stockholders' equity $ 2,223,374 $ 2,474,701 $ 1,236 $ — $ (2,368,272 ) $ 2,331,039 CONSOLIDATING BALANCE SHEET (Thousands of dollars) December 31, 2016 Assets Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Current assets Cash and cash equivalents $ — $ 153,813 $ — $ — $ — $ 153,813 Accounts receivable—trade, less allowance for doubtful accounts of $1,891 in 2016 — 183,519 — — — 183,519 Inventories, at lower of cost or market — 153,351 — — — 153,351 Prepaid expenses and other current assets — 24,871 — — — 24,871 Total current assets — 515,554 — — — 515,554 Property, plant and equipment, at cost less accumulated depreciation and amortization of $780,426 in 2016 — 1,532,655 — — — 1,532,655 Investments in subsidiaries 1,978,110 144,917 — — (2,123,027 ) — Other assets — 40,531 — — — 40,531 Total assets $ 1,978,110 $ 2,233,657 $ — $ — $ (2,123,027 ) $ 2,088,740 Liabilities and Stockholders' Equity Current liabilities Current maturities of long-term debt $ — $ 40,596 $ — $ — $ — $ 40,596 Inter-company accounts payable 623,316 (416,914 ) (52,064 ) (154,338 ) — — Trade accounts payable and accrued liabilities — 473,370 — — — 473,370 Income taxes payable — 591 3 — — 594 Total current liabilities 623,316 97,643 (52,061 ) (154,338 ) — 514,560 Long-term debt, including capitalized lease obligations — 629,622 — — — 629,622 Deferred income taxes — 204,656 — — — 204,656 Asset retirement obligations — 26,200 — — — 26,200 Deferred credits and other liabilities — 16,626 — — — 16,626 Total liabilities 623,316 974,747 (52,061 ) (154,338 ) — 1,391,664 Stockholders' Equity Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding) — — — — — — Common Stock, par $0.01 (authorized 200,000,000 shares, 46,767,164 shares issued at December 31, 2016) 468 1 60 — (61 ) 468 Treasury stock (9,831,196 shares held at December 31, 2016) (608,001 ) — — — — (608,001 ) Additional paid in capital (APIC) 1,213,056 571,117 52,004 87,543 (1,368,382 ) 555,338 Retained earnings 749,271 687,792 (3 ) 66,795 (754,584 ) 749,271 Total stockholders' equity 1,354,794 1,258,910 52,061 154,338 (2,123,027 ) 697,076 Total liabilities and stockholders' equity $ 1,978,110 $ 2,233,657 $ — $ — $ (2,123,027 ) $ 2,088,740 CONSOLIDATING INCOME STATEMENT (Thousands of dollars) Year ended December 31, 2017 Operating Revenues Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Petroleum product sales $ — $ 10,287,856 $ — $ — $ — $ 10,287,856 Merchandise sales — 2,372,658 — — — 2,372,658 Other operating revenues — 166,037 2 — — 166,039 Total operating revenues — 12,826,551 2 — — 12,826,553 Operating expenses Petroleum product cost of goods sold — 9,773,211 — — — 9,773,211 Merchandise cost of goods sold — 1,991,404 — — — 1,991,404 Station and other operating expenses — 514,866 7 — — 514,873 Depreciation and amortization — 116,942 24 — — 116,966 Selling, general and administrative — 141,170 1 — — 141,171 Accretion of asset retirement obligations — 1,785 — — — 1,785 Total operating expenses — 12,539,378 32 — — 12,539,410 Gain (loss) on sale of assets — (3,950 ) — — — (3,950 ) Income from operations — 283,223 (30 ) — — 283,193 Other income (expense) Interest income — 1,309 — — — 1,309 Interest expense — (46,660 ) — — — (46,660 ) Other nonoperating income — 2,180 — — — 2,180 Total other income (expense) — (43,171 ) — — — (43,171 ) Income from continuing operations before income taxes — 240,052 (30 ) — — 240,022 Income tax expense (benefit) — (5,231 ) (11 ) — — (5,242 ) Income (loss) — 245,283 (19 ) — — 245,264 Income (loss) from discontinued operations, net of income taxes — — — — — — Equity earnings in affiliates, net of tax 245,264 (19 ) — — (245,245 ) — Net Income (Loss) $ 245,264 $ 245,264 $ (19 ) $ — $ (245,245 ) $ 245,264 CONSOLIDATING INCOME STATEMENT (Thousands of dollars) Year ended December 31, 2016 Operating Revenues Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Petroleum product sales $ — $ 9,070,623 $ — $ — $ — $ 9,070,623 Merchandise sales — 2,338,586 — — — 2,338,586 Ethanol sales and other — 185,344 — — — 185,344 Total operating revenues — 11,594,553 — — — 11,594,553 Operating Expenses Petroleum product cost of goods sold — 8,603,953 — — — 8,603,953 Merchandise cost of goods sold — 1,974,486 — — — 1,974,486 Station and other operating expenses — 493,320 — — — 493,320 Depreciation and amortization — 98,610 — — — 98,610 Selling, general and administrative — 122,668 1 — — 122,669 Accretion of asset retirement obligations — 1,650 — — — 1,650 Total operating expenses — 11,294,687 1 — — 11,294,688 Gain (loss) on sale of assets — 88,212 — — — 88,212 Income from operations — 388,078 (1 ) — — 388,077 Other income (expense) Interest income — 578 — — — 578 Interest expense — (39,704 ) — — — (39,704 ) Other nonoperating income — 3,080 — — — 3,080 Total other income (expense) — (36,046 ) — — — (36,046 ) Income from continuing operations before income taxes — 352,032 (1 ) — — 352,031 Income tax expense (benefit) — 130,539 — — — 130,539 Income from continuing operations — 221,493 (1 ) — — 221,492 Income (loss) from discontinued operations, net of income taxes — — — — — — Equity earnings in affiliates, net of tax 221,492 (1 ) — — (221,491 ) — Net Income $ 221,492 $ 221,492 $ (1 ) $ — $ (221,491 ) $ 221,492 CONSOLIDATING INCOME STATEMENT (Thousands of dollars) Year ended December 31, 2015 Operating Revenues Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Petroleum product sales $ — $ 10,424,855 $ — $ — $ (120,166 ) $ 10,304,689 Merchandise sales — 2,273,888 — — — 2,273,888 Ethanol sales and other — 120,834 — — — 120,834 Total operating revenues — 12,819,577 — — (120,166 ) 12,699,411 Operating expenses Petroleum product cost of goods sold — 9,914,641 — — (120,166 ) 9,794,475 Merchandise cost of goods sold — 1,946,423 — — — 1,946,423 Station and other operating expenses — 486,383 — — — 486,383 Depreciation and amortization — 86,568 — — — 86,568 Selling, general and administrative — 129,276 1 — — 129,277 Accretion of asset retirement obligations — 1,521 — — — 1,521 Total operating expenses — 12,564,812 1 — (120,166 ) 12,444,647 Gain (loss) on sale of assets — (4,658 ) — — — (4,658 ) Income from operations — 250,107 (1 ) — — 250,106 Other income (expense) Interest income — 2,177 — — — 2,177 Interest expense — (33,531 ) — — — (33,531 ) Other nonoperating income — (463 ) — — — (463 ) Total other income (expense) — (31,817 ) — — — (31,817 ) Income from continuing operations before income taxes — 218,290 (1 ) — — 218,289 Income tax expense (benefit) — 80,698 — — — 80,698 Income from continuing operations — 137,592 (1 ) — — 137,591 Income from discontinued operations, net of income taxes — — — 38,749 — 38,749 Equity earnings in affiliates, net of tax 176,340 (22,731 ) — (61,479 ) (92,130 ) — Net Income $ 176,340 $ 114,861 $ (1 ) $ (22,730 ) $ (92,130 ) $ 176,340 CONSOLIDATING STATEMENT OF CASH FLOWS (Thousands of dollars) Year ended December 31, 2017 Operating Activities Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net income (loss) $ 245,264 $ 245,264 $ (19 ) $ — $ (245,245 ) $ 245,264 Adjustments to reconcile net income (loss) to net cash provided by operating activities Income from discontinued operations, net of tax — — — — — — Depreciation and amortization — 116,942 24 — — 116,966 Deferred and noncurrent income tax charges (benefits) — (50,411 ) — — — (50,411 ) Accretion of asset retirement obligations — 1,785 — — — 1,785 (Gain) loss from sale of assets — 3,950 — — — 3,950 Net decrease (increase) in noncash operating working capital — (36,933 ) (21 ) — — (36,954 ) Equity in earnings (245,264 ) 19 — — 245,245 — Other operating activities - net — 3,025 — — — 3,025 Net cash provided by (required by) operating activities — 283,641 (16 ) — — 283,625 Investing Activities Property additions — (257,062 ) (1,195 ) — — (258,257 ) Proceeds from sale of assets — 887 — — — 887 Changes in restricted cash — — — — — — Other investing activities - net — (4,737 ) — — — (4,737 ) Sales proceeds — — — — — — Other — — — — — — Net cash provided by (required by) investing activities — (260,912 ) (1,195 ) — — (262,107 ) Financing Activities Purchase of treasury stock (205,992 ) — — — — (205,992 ) Repayments of long-term debt — (131,412 ) — — — (131,412 ) Additions to long-term debt — 338,750 — — — 338,750 Debt issuance costs — (1,100 ) — — — (1,100 ) Amounts related to share-based compensation — (5,549 ) — — — (5,549 ) Net distributions to parent 205,992 (207,253 ) 1,261 — — — Net cash provided by (required by) financing activities — (6,564 ) 1,261 — — (5,303 ) Net change in cash and cash equivalents — 16,165 50 — — 16,215 Cash and cash equivalents at January 1 — 153,813 — — — 153,813 Cash and cash equivalents at December 31 $ — $ 169,978 $ 50 $ — $ — $ 170,028 Less: Cash and cash equivalents held for sale — — — — — — Cash and cash equivalents of continuing operations at December 31 $ — $ 169,978 $ 50 $ — $ — $ 170,028 CONSOLIDATING STATEMENT OF CASH FLOWS (Thousands of dollars) Year ended December 31, 2016 Operating Activities Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net income (loss) $ 221,492 $ 221,492 $ (1 ) $ — $ (221,491 ) $ 221,492 Adjustments to reconcile net income (loss) to net cash provided by operating activities Income from discontinued operations, net of tax — — — — — — Depreciation and amortization — 98,610 — — — 98,610 Deferred and noncurrent income tax charges (credits) — 40,407 — — — 40,407 Accretion of asset retirement obligations — 1,650 — — — 1,650 Pretax gains from sale of assets — (88,212 ) — — — (88,212 ) Net decrease (increase) in noncash operating working capital — 53,726 — — — 53,726 Equity in earnings (221,492 ) 1 — — 221,491 — Other operating activities - net — 9,767 — — — 9,767 Net cash provided by (used in) continuing operations — 337,441 (1 ) — — 337,440 Net cash provided by discontinued operations — — — — — — Net cash provided by (used in) operating activities — 337,441 (1 ) — — 337,440 Investing Activities Property additions — (262,144 ) — — — (262,144 ) Proceeds from sale of assets — 85,327 — — — 85,327 Changes in restricted cash — 68,571 — — — 68,571 Other investing activities - net — (28,963 ) — — — (28,963 ) Sales proceeds — — — — — — Other — 2,355 — — — 2,355 Net cash provided by (required by) investing activities — (134,854 ) — — — (134,854 ) Financing Activities Purchase of treasury stock (323,272 ) — — — — (323,272 ) Repayments of long-term debt — (20,438 ) — — — (20,438 ) Additions to long-term debt — 200,000 — — — 200,000 Debt issuance costs — (3,240 ) — — — (3,240 ) Amounts related to share-based compensation — (4,158 ) — — — (4,158 ) Net distributions to parent 323,272 (323,273 ) 1 — — — Net cash provided by (required by) financing activities — (151,109 ) 1 — — (151,108 ) Net change in cash and cash equivalents — 51,478 — — — 51,478 Cash and cash equivalents at January 1 — 102,335 — — — 102,335 Cash and cash equivalents at December 31 $ — $ 153,813 $ — $ — $ — $ 153,813 Less: Cash and cash equivalents held for sale — — — — — — Cash and cash equivalents of continuing operations at December 31 $ — $ 153,813 $ — $ — $ — $ 153,813 CONSOLIDATING STATEMENT OF CASH FLOWS (Thousands of dollars) Year ended December 31, 2015 Operating Activities Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net income (loss) $ 176,340 $ 114,861 $ (1 ) $ (22,730 ) $ (92,130 ) $ 176,340 Adjustments to reconcile net income (loss) to net cash provided by operating activities Income from discontinued operations, net of tax — — — (38,749 ) — (38,749 ) Depreciation and amortization — 86,568 — — — 86,568 Deferred and noncurrent income tax charges (credits) — 40,556 — — — 40,556 Accretion of asset retirement obligations — 1,521 — — — 1,521 Pretax gains from sale of assets — 4,658 — — — 4,658 Net decrease (increase) in noncash operating working capital — (46,586 ) — — — (46,586 ) Equity in earnings (176,340 ) 22,731 — 61,479 92,130 — Other operating activities - net — 9,417 — — — 9,417 Net cash provided by (used in) continuing operations — 233,726 (1 ) — — 233,725 Net cash provided by discontinued operations — — — (17,887 ) — (17,887 ) Net cash provided by (used in) operating activities — 233,726 (1 ) (17,887 ) — 215,838 Investing Activities Property additions — (205,225 ) — — — (205,225 ) Proceeds from sale of assets — 729 — — — 729 Changes in restricted cash — (68,571 ) — — — (68,571 ) Other investing activities - net — (2,889 ) — — — (2,889 ) Sales proceeds — — — 93,765 — 93,765 Other — — — (7,443 ) — (7,443 ) Net cash provided by (required by) investing activities — (275,956 ) — 86,322 — (189,634 ) Financing Activities Purchase of treasury stock (248,695 ) — — — — (248,695 ) Repayments of long-term debt — (146 ) — — — (146 ) Additions to long-term debt — — — — — — Debt issuance costs — (58 ) — — — (58 ) Amounts related to share-based compensation — (3,075 ) — — — (3,075 ) Net distributions to parent 248,695 (179,319 ) 1 (69,377 ) — — Net cash provided by (required by) financing activities — (182,598 ) 1 (69,377 ) — (251,974 ) Net change in cash and cash equivalents — (224,828 ) — (942 ) — (225,770 ) Cash and cash equivalents at January 1 — 327,163 — 942 — 328,105 Cash and cash equivalents at December 31 $ — $ 102,335 $ — $ — $ — $ 102,335 Less: Cash and cash equivalents held for sale — — — — — — Cash and cash equivalents of continuing operations at December 31 $ — $ 102,335 $ — $ — $ — $ 102,335 CONSOLIDATING STATEMENT OF CHANGES IN EQUITY (Thousands of dollars) Year ended December 31, 2017 Statement of Stockholders' Equity Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Common Stock Balance as of December 31, 2016 $ 468 $ 1 $ 60 $ — $ (61 ) $ 468 Issuance of common stock — — — — — — Balance as of December 31, 2017 $ 468 $ 1 $ 60 $ — $ (61 ) $ 468 Treasury Stock Balance as of December 31, 2016 $ (608,001 ) $ — $ — $ — $ — $ (608,001 ) Issuance of common stock 7,482 — — — — 7,482 Repurchase of common stock (205,992 ) — — — — (205,992 ) Balance as of December 31, 2017 $ (806,511 ) $ — $ — $ — $ — $ (806,511 ) APIC Balance as of December 31, 2016 $ 1,213,056 $ 571,117 $ 52,004 $ 87,543 $ (1,368,382 ) $ 555,338 Issuance of common stock (7,374 ) — — — — (7,374 ) Amounts related to share-based compensation — (5,549 ) — — — (5,549 ) Share-based compensation expense — 7,495 — — — 7,495 Balance as of December 31, 2017 $ 1,205,682 $ 573,063 $ 52,004 $ 87,543 $ (1,368,382 ) $ 549,910 Retained Earnings Balance as of December 31, 2016 $ 749,271 $ 687,792 $ (3 ) $ 66,795 $ (754,584 ) $ 749,271 Net income 245,264 245,264 (19 ) — (245,245 ) 245,264 Balance as of December 31, 2017 $ 994,535 $ 933,056 $ (22 ) $ 66,795 $ (999,829 ) $ 994,535 CONSOLIDATING STATEMENTS OF CHANGES IN EQUITY (Thousands of dollars) Year ended December 31, 2016 Statement of Stockholders' Equity Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Common Stock Balance as of December 31, 2015 $ 468 $ 1 $ 60 $ — $ (61 ) $ 468 Issuance of common stock — — — — — — Balance as of December 31, 2016 $ 468 $ 1 $ 60 $ — $ (61 ) $ 468 Treasury Stock Balance as of December 31, 2015 $ (294,139 ) $ — $ — $ — $ — $ (294,139 ) Issuance of common stock 9,410 — — — — 9,410 Repurchase of common stock (323,272 ) — — — — (323,272 ) Balance as of December 31, 2016 $ (608,001 ) $ — $ — $ — $ — $ (608,001 ) APIC Balance as of December 31, 2015 $ 1,222,466 $ 564,551 $ 52,004 $ 87,543 $ (1,368,382 ) $ 558,182 Issuance of common stock (9,410 ) — — — — (9,410 ) Amounts related to share-based compensation — (2,748 ) — — — (2,748 ) Reclassification of equity — — — — — — Share-based compensation expense — 9,314 — — — 9,314 Balance as of December 31, 2016 $ 1,213,056 $ 571,117 $ 52,004 $ 87,543 $ (1,368,382 ) $ 555,338 Retained Earnings Balance as of December 31, 2015 $ 527,779 $ 466,300 $ (2 ) $ 66,795 $ (533,093 ) $ 527,779 Net income 221,492 221,492 (1 ) — (221,491 ) 221,492 Balance as of December 31, 2016 $ 749,271 $ 687,792 $ (3 ) $ 66,795 $ (754,584 ) $ 749,271 CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Thousands of dollars) Year ended December 31, 2015 Statement of Stockholders' Equity Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Common Stock Balance as of December 31, 2014 $ 468 $ 1 $ 60 $ — $ (61 ) $ 468 Issuance of common stock — — — — — — Balance as of December 31, 2015 $ 468 $ 1 $ 60 $ — $ (61 ) $ 468 Treasury Stock Balance as of December 31, 2014 $ (51,073 ) $ — $ — $ — $ — $ (51,073 ) Issuance of common stock 5,629 — — — — 5,629 Repurchase of common stock (248,695 ) — — — — (248,695 ) Balance as of December 31, 2015 $ (294,139 ) $ — $ — $ — $ — $ (294,139 ) APIC Balance as of December 31, 2014 $ 1,228,095 $ 558,611 $ 52,004 $ 35,677 $ (1,316,516 ) $ 557,871 Issuance of common stock (5,629 ) — — — — (5,629 ) Amounts related to share-based compensation — (3,075 ) — 51,866 (51,866 ) (3,075 ) Share-based compensation expense — 9,015 — — — 9,015 Balance as of December 31, 2015 $ 1,222,466 $ 564,551 $ 52,004 $ 87,543 $ (1,368,382 ) $ 558,182 Retained Earnings Balance as of December 31, 2014 $ 351,439 $ 351,439 $ (1 ) $ 89,525 $ (440,963 ) $ 351,439 Net income 176,340 114,861 (1 ) (22,730 ) (92,130 ) 176,340 Balance as of December 31, 2015 $ 527,779 $ 466,300 $ (2 ) $ 66,795 $ (533,093 ) $ 527,779

Subsequent Event (Notes)

Subsequent Event (Notes)	12 Months Ended
	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event In December 2017, the Fifth Circuit Court of Appeals affirmed an award to the Company of $58.7 million arising from damages incurred in connection with the 2010 Deepwater Horizon oil spill. After the payment of all fees and expenses, the Company received $47.0 million in February 2018 and this amount will be recognized as income in the first quarter of 2018.

Supplemental Quarterly Informat

Supplemental Quarterly Information	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Supplemental Quarterly Information	Murphy USA Inc. Supplemental Quarterly Information (Unaudited) First Second Third Fourth (Millions of dollars except per share amounts) Quarter Quarter Quarter Quarter Year Year Ended December 31, 2017 Sales and other operating revenues $ 2,999.6 $ 3,211.1 $ 3,236.3 $ 3,379.5 $ 12,826.6 Income (loss) from continuing operations before income taxes $ (9.8 ) $ 89.9 $ 108.7 $ 51.2 $ 240.0 Income (loss) from continuing operations $ (3.0 ) $ 55.5 $ 67.9 $ 124.9 $ 245.3 Net income (loss) $ (3.0 ) $ 55.5 $ 67.9 $ 124.9 $ 245.3 Income (loss) from continuing operations (per Common share) Basic $ (0.08 ) $ 1.52 $ 1.92 $ 3.62 $ 6.85 Diluted $ (0.08 ) $ 1.51 $ 1.90 $ 3.58 $ 6.78 Net income (loss) (per Common share) Basic $ (0.08 ) $ 1.52 $ 1.92 $ 3.62 $ 6.85 Diluted $ (0.08 ) $ 1.51 $ 1.90 $ 3.58 $ 6.78 Market price of Common stock 1 High $ 73.42 $ 74.49 $ 76.85 $ 81.00 $ 81.00 Low $ 61.03 $ 65.00 $ 64.24 $ 69.11 $ 61.03 Year Ended December 31, 2016 Sales and other operating revenues $ 2,490.3 $ 3,005.8 $ 3,042.7 $ 3,055.8 $ 11,594.6 Income (loss) from continuing operations before income taxes $ 139.3 $ 74.1 $ 71.8 $ 66.8 $ 352.0 Income (loss) from continuing operations $ 85.9 $ 46.3 $ 45.5 $ 43.8 $ 221.5 Net income (loss) $ 85.9 $ 46.3 $ 45.5 $ 43.8 $ 221.5 Income (loss) from continuing operations (per Common share) Basic $ 2.10 $ 1.18 $ 1.17 $ 1.16 $ 5.64 Diluted $ 2.08 $ 1.17 $ 1.16 $ 1.14 $ 5.59 Net income (loss) (per Common share) Basic $ 2.10 $ 1.18 $ 1.17 $ 1.16 $ 5.64 Diluted $ 2.08 $ 1.17 $ 1.16 $ 1.14 $ 5.59 Market price of Common stock 1 High $ 67.18 $ 74.16 $ 79.29 $ 72.56 $ 79.29 Low $ 54.24 $ 57.42 $ 70.08 $ 57.80 $ 54.24 1 Prices as quoted on the New York Stock Exchange.

Schedule II - Valuation And Qua

Schedule II - Valuation And Qualifying Accounts	12 Months Ended
	Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]
Schedule II - Valuation And Qualifying Accounts	SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS Murphy USA Inc. Valuation Accounts and Reserves (Thousands of dollars) Balance at January 1, Charged (Credited) to Expense Deductions Balance at December 31, 2017 Deducted from assets accounts Allowance for doubtful accounts $ 1,891 (797 ) — 1,094 2016 Deducted from assets accounts Allowance for doubtful accounts $ 1,963 — (72 ) 1,891 2015 Deducted from assets accounts Allowance for doubtful accounts $ 4,456 — (2,493 ) 1,963

Significant Accounting Polici30

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Principles of Consolidation	PRINCIPLES OF CONSOLIDATION – These consolidated financial statements were prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) and include the accounts of Murphy USA Inc. and its subsidiaries for all periods presented. All significant intercompany accounts and transactions within the consolidated financial statements have been eliminated.
Revenue Recognition	REVENUE RECOGNITION – Revenues from sales of refined petroleum products are recorded when deliveries have occurred and legal ownership of the commodity transfers to the customer, which may include related party sales to other subsidiaries of Murphy USA. Title transfer for bulk refined products generally occur at pipeline custody points or upon truck loading at product terminals. Refined products sold at retail stores are recorded when the customer takes delivery at the pump. Merchandise revenues are recorded at the point of sale. Rebates from vendors are recognized as a reduction of cost of goods sold when the related inventory item is sold. Incentives that are derived from contractual provisions are accrued based on past experience, when estimable, and are recognized in cost of goods sold. The Company enters into buy/sell and similar arrangements when petroleum products are held at one location but are needed at a different location. The Company often pays or receives funds related to the buy/sell arrangement based on location or quality differences. The Company accounts for such transactions on a net basis in its Consolidated Income Statements.
Shipping and Handling Costs	SHIPPING AND HANDLING COSTS – Costs incurred for the shipping and handling of motor fuel are included in Petroleum product cost of goods sold in the Consolidated Income Statements. Costs incurred for the shipping and handling of convenience store merchandise are included in Merchandise cost of goods sold in the Consolidated Income Statements.
Taxes Collected from Customers and Remitted to Government Authorities	TAXES COLLECTED FROM CUSTOMERS AND REMITTED TO GOVERNMENT AUTHORITIES – Excise and other taxes collected on sales of refined products and remitted to governmental agencies are included in operating revenues and operating expenses in the Consolidated Income Statements.
Cash Equivalents	CASH EQUIVALENTS – Short-term investments, which include government securities, money market funds and other instruments with government securities as collateral, that have an original maturity of three months or less from the date of purchase are classified as cash equivalents.
Accounts Receivable	ACCOUNTS RECEIVABLE – The Company’s accounts receivable are recorded at the invoiced amount and do not bear interest. The accounts receivable primarily consists of amounts owed to the Company from credit card companies and by customers for wholesale sales of refined petroleum products. The allowance for doubtful accounts is the Company’s best estimate of the amount of probable credit losses on these receivables. The Company reviews this allowance for adequacy at least quarterly and bases its assessment on a combination of current information about its customers and historical write-off experience. Any trade accounts receivable balances written off are charged against the allowance for doubtful accounts. The Company has not experienced any significant credit-related losses in the past three years.
Inventories	INVENTORIES – Inventories of most finished products are valued at the lower of cost, generally applied on a last-in, first-out (“LIFO”) basis, or market. Any increments to LIFO inventory volumes are valued based on the first purchase price for these volumes during the year. Merchandise inventories held for resale are carried at average cost. Materials and supplies are valued at the lower of average cost or estimated value.
Vendor Allowances and Rebates	VENDOR ALLOWANCES AND REBATES – Murphy USA receives payments for vendor allowances, volume rebates and other related payments from various suppliers of its convenience store merchandise. Vendor allowances for price markdowns are credited to merchandise cost of goods sold during the period the related markdown is recognized. Volume rebates of merchandise are recorded as reductions to merchandise cost of goods sold when the merchandise qualifying for the rebate is sold. Slotting and stocking allowances received from a vendor are recorded as a reduction to cost of sales over the period covered by the agreement.
Property, Plant and Equipment	PROPERTY, PLANT AND EQUIPMENT – Additions to property, plant and equipment, including renewals and betterments, are capitalized and recorded at cost. Certain marketing facilities are primarily depreciated using the composite straight-line method with depreciable lives ranging from 16 to 25 years. Gasoline stations, improvements to gasoline stations and other assets are depreciated over 3 to 50 years by individual unit on the straight-line method. In 2017, we revised the historical presentation of gains and losses on asset disposals or retirements to include them as a separate line item in income from operations. The Company capitalizes interest costs as a component of construction in progress on individually significant projects based on the weighted average interest rates incurred on its long-term borrowings. Total interest cost capitalized in 2017 was $3.8 million and $0.3 million in 2016. The Company has undertaken like-kind exchange ("LKE") transactions under the Federal tax code in an effort to acquire and sell real and personal property in a tax efficient manner. The Company generally enters into forward transactions, in which property is sold and the proceeds are reinvested by acquiring similar property; and reverse transactions, in which property is acquired and similar property is subsequently sold. A qualified LKE intermediary is used to facilitate these LKE transactions. Proceeds from forward LKE transactions are held by the intermediary and are classified as restricted cash on the Company's balance sheet because the funds must be reinvested in similar properties. If the acquisition of suitable LKE properties is not completed within 180 days of the sale of the Company-owned property, the proceeds are distributed to the Company by the intermediary and are reclassified as available cash and applicable income taxes are determined. An exchange accommodation titleholder, a type of variable interest entity, is used to facilitate reverse like-kind exchanges. The acquired assets are held by the exchange accommodation titleholder until the exchange transactions are complete. If the Company determines that it is the primary beneficiary of the exchange accommodation titleholder, the replacements assets held by the exchange accommodation titleholder are consolidated and recorded in Property, Plant and Equipment on the Consolidated Balance Sheets. The unspent proceeds that are held in trust with the intermediary are recorded as noncurrent assets in the Consolidated Balance Sheet as the cash was restricted for the acquisition of property, plant and equipment.
Impairment of Assets	IMPAIRMENT OF ASSETS – Long-lived assets, which include property and equipment and finite-lived intangible assets, are tested for recoverability whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. A long-lived asset is not recoverable if its carrying amount exceeds the sum of the undiscounted cash flows expected to result from its use and eventual disposition. If a long-lived asset is not recoverable, an impairment loss is recognized for the amount by which the carrying amount of the long-lived asset exceeds its fair value, with fair value determined based on discounted estimated net cash flows or other appropriate methods.
Asset Retirement Obligations	ASSET RETIREMENT OBLIGATIONS – The Company records a liability for asset retirement obligations (“ARO”) equal to the fair value of the estimated cost to retire an asset. The ARO liability is initially recorded in the period in which the obligation meets the definition of a liability, which is generally when the asset is placed in service. The ARO liability is estimated using existing regulatory requirements and anticipated future inflation rates. When the liability is initially recorded, the Company increases the carrying amount of the related long-lived asset by an amount equal to the original liability. The liability is increased over time to reflect the change in its present value, and the capitalized cost is depreciated over the useful life of the related long-lived asset. The Company reevaluates the adequacy of its recorded ARO liability at least annually. Actual costs of asset retirements such as dismantling service stations and site restoration are charged against the related liability. Any difference between costs incurred upon settlement of an asset retirement obligation and the recorded liability is recognized as a gain or loss in the Company’s Consolidated Income Statements.
Environmental Liabilities	ENVIRONMENTAL LIABILITIES – A liability for environmental matters is established when it is probable that an environmental obligation exists and the cost can be reasonably estimated. If there is a range of reasonably estimated costs, the most likely amount will be recorded, or if no amount is most likely, the minimum of the range is used. Related expenditures are charged against the liability. Environmental remediation liabilities have not been discounted for the time value of future expected payments. Environmental expenditures that have future economic benefit are capitalized.
Income Taxes	INCOME TAXES – The Company accounts for income taxes using the asset and liability method. Under this method, income taxes are provided for amounts currently payable and for amounts deferred as tax assets and liabilities based on differences between the financial statement carrying amounts and the tax bases of existing assets and liabilities. Deferred income taxes are measured using the enacted tax rates that are assumed will be in effect when the differences reverse. The Company routinely assesses the realizability of deferred tax assets based on available positive and negative evidence including assumptions of future taxable income, tax planning strategies and other pertinent factors. A deferred tax asset valuation allowance is recorded when evidence indicates that it is more likely than not that all or a portion of these deferred tax assets will not be realized in a future period. The accounting principles for income tax uncertainties permit recognition of income tax benefits only when they are more likely than not to be realized. The Company’s results of operations were included in the consolidated federal income tax return of Murphy Oil prior to the separation, while in most cases, these results have been included in the various state tax returns of Murphy USA historically. The Company has elected to classify any interest expense and penalties related to the underpayment of income taxes in Income tax expense in the Consolidated Income Statements.
Derivative Instruments and Hedging Activities	DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES – The fair value of a derivative instrument is recognized as an asset or liability in the Company’s Consolidated Balance Sheets. Upon entering into a derivative contract, the Company may designate the derivative as either a fair value hedge or a cash flow hedge, or decide that the contract is not a hedge, and therefore, recognize changes in the fair value of the contract in earnings. The Company documents the relationship between the derivative instrument designated as a hedge and the hedged items as well as its objective for risk management and strategy for use of the hedging instrument to manage the risk. See Note 12 and Note 15 for further information about the Company’s derivatives.
Stock-Based Compensation	STOCK-BASED COMPENSATION – The fair value of awarded stock options, restricted stock, restricted stock units and performance stock units is determined based on a combination of management assumptions for awards issued. The Company uses the Black-Scholes option pricing model for computing the fair value of stock options. The primary assumptions made by management included the expected life of the stock option award and the expected volatility of the Company’s common stock prices. The Company uses both historical data and current information to support its assumptions. Stock option expense is recognized on a straight-line basis over the requisite service period of three years. The Company uses a Monte Carlo valuation model to determine the fair value of performance-based stock units that are based on performance compared against a peer group and the related expense is recognized over the three -year requisite service period. Management estimates the number of all awards that will not vest and adjusts its compensation expense accordingly. Differences between estimated and actual vested amounts are accounted for as an adjustment to expense when known.
Use of Estimates	USE OF ESTIMATES – In preparing the financial statements of the Company in conformity with U.S. GAAP, management has made a number of estimates and assumptions related to the reporting of assets, liabilities, revenues, and expenses and the disclosure of contingent assets and liabilities. Actual results may differ from the estimates. On an ongoing basis, we review our estimates based on currently available information. Changes in facts and circumstances may result in revised estimates.
Recent Accounting and Reporting Rules	In May 2014, the FASB issued ASU No. 2014-09 “Revenue from Contracts with Customers,” which supersedes the revenue recognition requirements in the Accounting Standards Codification (“Codification”) Topic 605, Revenue Recognition, and most industry-specific guidance throughout the Industry Topics of the Codification. The core principle of the new ASU No. 2014-09 is for companies to recognize revenue from the transfer of goods or services to customers in amounts that reflect the consideration to which the company expects to be entitled in exchange for those goods or services. The Company will adopt ASU No. 2014-09 beginning January 1, 2018 using the modified retrospective approach applied to those contracts that were not completed at that date. Prior periods will not be retrospectively adjusted. The Company has completed its analysis to identify all revenue streams, and has determined the impact the ASU will have on these various revenue streams and the consolidated financial statements and believes that impact is immaterial. The Company has implemented new controls and processes to compliment the new guidance. The Company currently presents excise tax and other similar taxes collected on sales of refined products and remitted to governmental agencies on a gross basis, in both revenues and cost of petroleum products sold in the income statement. ASU 2014-09 requires the Company to either analyze each tax on a jurisdiction-by-jurisdiction basis to determine if it is the principal in the transaction and continue to present the tax on a gross basis or elect to report all taxes on a net basis. The Company will elect to assess all excise and other similar taxes on a jurisdiction-by-jurisdiction basis resulting in certain taxes to be presented on a net basis upon adoption of ASU 2014-09, thus reducing revenue in the income statement with no impact to net income or cash flows. The Company does not expect the impact on reported revenue for the year ended December 31, 2018 to be material. In February 2016, the FASB issued ASU No. 2016-02, "Leases (Topic 842)" (“ASU 2016-02”). ASU 2016-02 amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets. Lessor accounting will remain similar to lessor accounting under previous GAAP, while aligning with the FASB’s new revenue recognition guidance. ASU 2016-02 is effective for the Company beginning January 1, 2019. Early adoption of ASU 2016-02 is permitted. The standard requires a modified retrospective transition approach for all leases existing at, or entered into after, the date of initial application, with an option to use certain transition relief. While this ASU will have impact on our internal processes and controls and result in a change to our accounting, we are still in the evaluation and information gathering stage of implementing the guidance and cannot yet estimate the potential impact. In March 2016, the FASB issued ASU No. 2016-09, "Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting", which amends the current stock compensation guidance. The amendments simplify the accounting for the taxes related to stock based compensation, including adjustments to how excess tax benefits and a company’s payments for tax withholdings should be classified among other changes. The standard was effective for the Company on January 1, 2017. The primary impact of adoption for the twelve month period ended December 31, 2017 was the recognition of $2.2 million of excess tax benefits in the provision for income taxes rather than paid-in-capital for the current period. Additional amendments to the accounting for income taxes and minimum statutory withholding tax requirements had no impact to retained earnings as of January 1, 2017, where the cumulative effect of those changes is required to be recorded. The Company elected to continue to estimate forfeitures expected to occur to determine the amount of compensation cost to be recognized each period. The Company elected to apply the presentation requirements for cash flows related to excess tax benefits prospectively as of January 1, 2017. The presentation requirements for cash flows related to employee taxes paid for withheld shares had no impact to any of the periods presented on the consolidated statement of cash flows, as such cash flows have historically been presented as a financing activity.

Discontinued Operations (Tables

Discontinued Operations (Tables)	12 Months Ended
	Dec. 31, 2017
Hereford Production Facility [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Summary of Results of Operations of Discontinued Operations	The following table presents financial results of the Hereford business: Twelve months ended December 31, (Thousands of dollars) 2015 Operating Revenues Ethanol sales $ 154,502 Total operating revenues 154,502 Operating expenses Ethanol cost of goods sold 121,753 Station and other operating expenses 27,881 Depreciation and amortization 333 Selling, general and administrative expenses 1,382 Total operating expenses 151,349 Gain (loss) on sale of assets 60,782 Income from operations before taxes 63,935 Income taxes 25,186 Net income $ 38,749 The following table presents cash flow of the Hereford ethanol plant: Twelve months ended December 31, (Thousands of dollars) 2015 Net cash provided by (used in) discontinued operating activities $ (17,887 ) Net cash provided by (used in) discontinued investing activities $ 86,322

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
Summary of Inventory	Inventories consisted of the following: December 31, (Thousands of dollars) 2017 2016 Finished products - FIFO basis $ 231,927 $ 207,903 Less LIFO reserve - finished products (167,201 ) (153,319 ) Finished products - LIFO basis 64,726 54,584 Store merchandise for resale 104,789 95,649 Materials and supplies 12,962 3,118 Total inventories $ 182,477 $ 153,351

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Summary of Property, Plant and Equipment	December 31, 2017 December 31, 2016 (Thousands of dollars) Estimated Useful Life Cost Net Cost Net Land $ 586,502 $ 586,502 $ 577,743 $ 577,743 Pipeline and terminal facilities 16 to 25 years 72,019 42,975 67,946 41,218 Retail gasoline stations 3 to 50 years 1,752,555 968,900 1,565,275 867,165 Buildings 20 to 45 years 54,584 42,898 33,375 22,310 Other 3 to 20 years 88,485 38,195 68,742 24,219 $ 2,554,145 $ 1,679,470 $ 2,313,081 $ 1,532,655

Accounts Payable And Accrued 34

Accounts Payable And Accrued Liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Payables and Accruals [Abstract]
Schedule of Accounts Payable and Accrued Liabilities	Trade accounts payable and accrued liabilities consisted of the following: December 31, (Thousands of dollars) 2017 2016 Trade accounts payable $ 339,606 $ 309,988 Excise taxes/withholdings payable 89,454 76,552 Accrued insurance obligations 21,404 21,631 Accrued taxes other than income 25,282 26,740 Other 37,718 38,459 Accounts payable and accrued liabilities $ 513,464 $ 473,370

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Summary of Long-Term Debt	Long-term debt consisted of the following: December 31, (Thousands of dollars) 2017 2016 6.00% senior notes due 2023 (net of unamortized discount of $4,957 at 2017 and $5,826 at 2016) $ 495,043 $ 494,174 5.625% senior notes due 2027 (net of unamortized discount of $3,496 at 2017) 296,504 — Term loan due 2020 (effective rate of 4.15% at December 31, 2017) 92,000 180,000 Capitalized lease obligations, vehicles, due through 2021 2,359 1,451 Unamortized debt issuance costs (5,155 ) (5,407 ) Total long-term debt 880,751 670,218 Less current maturities 19,887 40,596 Total long-term debt, net of current $ 860,864 $ 629,622

Asset Retirement Obligations 36

Asset Retirement Obligations (ARO) (Tables)	12 Months Ended
	Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract]
Reconciliation of Beginning and Ending Aggregate Carrying Amount of Asset Retirement Obligation	A reconciliation of the beginning and ending aggregate carrying amount of the ARO is shown in the following table. December 31, (Thousands of dollars) 2017 2016 Balance at beginning of period $ 26,200 $ 24,345 Accretion expense 1,785 1,650 Settlements of liabilities (277 ) (174 ) Liabilities incurred 451 379 Balance at end of period $ 28,159 $ 26,200

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Summary of Effective Income Tax Rates	The components of income from continuing operations before income taxes for each of the three years ended December 31, 2017 and income tax expense (benefit) attributable thereto were as follows: Years Ended December 31, (Thousands of dollars) 2017 2016 2015 Income (loss) from continuing operations before income taxes $ 240,022 $ 352,031 $ 218,289 Income tax expense (benefit) Federal - Current $ 39,147 74,932 58,039 Federal - Deferred (50,714 ) 38,807 15,853 State - Current and deferred 6,325 16,800 6,806 Total $ (5,242 ) $ 130,539 $ 80,698
Schedule of Reconciliation of Income Taxes to Statutory Rate	The following table reconciles income taxes based on the U.S. statutory tax rate to the Company’s income tax expense (benefit). Years Ended December 31, (Thousands of dollars) 2017 2016 2015 Income tax expense based on the U.S. statutory tax rate $ 84,008 $ 123,211 $ 76,401 State income taxes, net of federal benefit 2,976 11,438 4,424 Effect of U.S. tax law change (88,927 ) — — Other, net (3,299 ) (4,110 ) (127 ) Total $ (5,242 ) $ 130,539 $ 80,698
Summary of Deferred Tax Assets and Deferred Tax Liabilities	An analysis of the Company’s deferred tax assets and deferred tax liabilities at December 31, 2017 and 2016 showing the tax effects of significant temporary differences is as follows: December 31, (Thousands of dollars) 2017 2016 Deferred tax assets Property costs and asset retirement obligations $ 2,833 $ 4,059 Employee benefits 4,382 10,742 Other deferred tax assets 3,436 7,623 Total gross deferred tax assets 10,651 22,424 Less valuation allowance — — Net deferred tax assets 10,651 22,424 Deferred tax liabilities Accumulated depreciation and amortization (142,081 ) (197,727 ) State deferred taxes (18,944 ) (18,643 ) Other deferred tax liabilities (3,871 ) (10,710 ) Total gross deferred tax liabilities (164,896 ) (227,080 ) Net deferred tax liabilities $ (154,245 ) $ (204,656 )
Reconciliation of Beginning and Ending Liability for Uncertain Tax Positions	A reconciliation of the beginning and ending amount of the consolidated liability for unrecognized income tax benefits during the year ended December 31, 2017 and 2016 is shown in the following table. Year Ended December 31, (Thousands of dollars) 2017 2016 Balance at January 1 $ 7,874 $ 5,450 Additions for tax positions related to prior years 4,406 3,771 Additions for tax positions related to current year — — Settlements with taxing authorities (5,451 ) — Expiration of statutes of limitation (2,391 ) (1,347 ) Balance at December 31 $ 4,438 $ 7,874

Incentive Plans (Tables)

Incentive Plans (Tables)	12 Months Ended
	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of Amounts Recognized in Financial Statements with Respect to Share-Based Plans	Amounts recognized in the financial statements by the Company with respect to all share-based plans are shown in the following table. All expense prior to August 30, 2013 was incurred under the 2007 Plan and the 2012 Plan while all amounts after August 30, 2013 were incurred in the MUSA 2013 Plan and the Directors Plan. December 31, (Thousands of dollars) 2017 2016 2015 Compensation charged against income before income tax benefit $ 7,495 $ 9,314 $ 9,015 Related income tax benefit recognized in income $ 2,623 $ 3,259 $ 3,155
Summary of Changes in Stock Options Outstanding	Changes in options outstanding for Company employees during the period from December 31, 2014 to December 31, 2017 are presented in the following table: Number of Shares Average Exercise Price Outstanding at December 31, 2014 660,635 $ 36.00 Granted at FMV 72,350 70.57 Vested and issued (236,620 ) 33.80 Forfeited (30,609 ) 40.21 Outstanding at December 31, 2015 465,756 42.22 Granted at FMV 96,500 59.11 Exercised (126,969 ) 34.48 Forfeited (14,350 ) 58.28 Outstanding at December 31, 2016 420,937 47.88 Granted at FMV 114,800 65.75 Exercised (43,887 ) 37.41 Forfeited (25,950 ) 63.63 Outstanding at December 31, 2017 465,900 $ 52.39 Exercisable at December 31, 2015 127,077 $ 36.71 Exercisable at December 31, 2016 218,937 $ 38.32 Exercisable at December 31, 2017 254,375 $ 42.80
Summary of Additional Stock Option Information	Additional information about stock options outstanding at December 31, 2017 is shown below: Options Outstanding Options Exercisable Range of Exercise Prices per Option No. of Options Avg. Life Remaining in Years Aggregate Intrinsic Value No. of Options Avg. Life Remaining in Years Aggregate Intrinsic Value $32.53 to $37.06 32,687 1.8 $ 1,518,763 32,687 1.8 $ 1,518,763 $37.07 to $39.45 264 0.1 11,428 264 0.1 11,428 $39.46 to $40.25 191,249 2.5 7,727,937 191,249 2.5 7,727,937 $40.26 to $70.57 241,700 5.3 3,773,099 30,175 3.9 295,413 465,900 3.9 $ 13,031,227 254,375 2.6 $ 9,553,541
Murphy Oil Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of Valuation Assumptions	Following are the assumptions used originally by Murphy Oil to value the original awards. Years Ended December 31, 2012 and 2011 Fair value per option grant 12.37 - 20.34 Assumptions Dividend yield 1.80% - 2.27% Expected volatility 37.00% - 39.62% Risk-free interest rate 0.55% - 2.10% Expected life 4.00 yrs. - 5.20 yrs.
MUSA 2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of Valuation Assumptions	Following are the assumptions used by the Company to value the original awards: Year Ended December 31, 2017 2016 2015 Fair value per option grant $ 15.45 $ 16.08 $ 20.18 Assumptions Dividend yield — — — Expected volatility 26.0 % 26.1 % 29.3 % Risk-free interest rate 1.65 % 1.26 % 1.52 % Expected life 4.2 years 5.7 years 5.0 years
Restricted Stock Units [Member] | MUSA 2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of Restricted Stock Unit Activity	(Number of units) Employee RSU's Outstanding at December 31, 2014 397,015 Granted at FMV 55,450 Vested and issued (66,116 ) Forfeited (30,049 ) Outstanding at December 31, 2015 356,300 Granted 74,325 Vested and issued (142,392 ) Forfeited (18,888 ) Outstanding at December 31, 2016 269,345 Granted 111,471 Vested and issued (60,688 ) Forfeited (61,112 ) Outstanding at December 31, 2017 259,016
Restricted Stock Units [Member] | 2013 Stock Plan For Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of Restricted Stock Unit Activity	(Number of units) Director RSU's Outstanding at December 31, 2014 50,850 Granted 12,924 Vested and issued — Forfeited — Outstanding at December 31, 2015 63,774 Granted 19,900 Vested and issued (34,332 ) Forfeited — Outstanding at December 31, 2016 49,342 Granted 15,948 Vested and issued (19,944 ) Forfeited — Outstanding at December 31, 2017 45,346
Performance Units [Member] | MUSA 2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of Restricted Stock Unit Activity	(Number of units) Employee PSU's Outstanding at December 31, 2014 72,000 Granted 40,400 Vested and issued — Forfeited (10,006 ) Outstanding at December 31, 2015 102,394 Granted 53,300 Vested and issued — Forfeited (7,954 ) Outstanding at December 31, 2016 147,740 Granted 53,800 Vested and issued (60,816 ) Forfeited (16,000 ) Outstanding at December 31, 2017 124,724

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Reconciliation of Basic and Diluted Earnings Per Share Computations	The following table provides a reconciliation of basic and diluted earnings per share computations for the years ended December 31, 2017 , 2016 and 2015 (in thousands, except per share amounts): Years ended December 31, (Thousands of dollars except per share amounts) 2017 2016 2015 Earnings per common share: Net income per share - basic Income from continuing operations $ 245,264 $ 221,492 $ 137,591 Income from discontinued operations $ — $ — $ 38,749 Net income attributable to common stockholders $ 245,264 $ 221,492 $ 176,340 Weighted average common shares outstanding (in thousands) 35,816 39,269 43,434 Earnings per share: Continuing operations $ 6.85 $ 5.64 $ 3.17 Discontinued operations $ — $ — $ 0.89 Total earnings per share $ 6.85 $ 5.64 $ 4.06 Earnings per common share - assuming dilution: Years ended December 31, 2017 2016 2015 Net income per share - diluted Income from continuing operations $ 245,264 $ 221,492 $ 137,591 Income from discontinued operations $ — $ — $ 38,749 Net income attributable to common stockholders $ 245,264 $ 221,492 $ 176,340 Weighted average common shares outstanding (in thousands) 35,816 39,269 43,434 Common equivalent shares: Share-based awards 340 377 360 Weighted average common shares outstanding - assuming dilution (in thousands) 36,156 39,646 43,794 Earnings per share: Continuing operations $ 6.78 $ 5.59 $ 3.14 Discontinued operations $ — $ — $ 0.88 Earnings per share - assuming dilution $ 6.78 $ 5.59 $ 4.02

Other Financial Information (Ta

Other Financial Information (Tables)	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Other Operating Revenues	Other operating revenues in the Consolidated Income Statements includes the following items: (Thousands of dollars) 2017 2016 2015 Renewable Identification Numbers (RINs) sales $ 160,279 $ 181,138 $ 117,513 Other 5,760 4,206 3,321 Total other operating revenue $ 166,039 $ 185,344 $ 120,834
Summary of Changes in Operating Working Capital	CHANGES IN WORKING CAPITAL - (Thousands of dollars) 2017 2016 2015 Accounts receivable $ (41,673 ) $ (47,203 ) $ 2,857 Inventories (16,344 ) 2,143 1,121 Prepaid expenses and other current assets (5,184 ) 13,705 (27,107 ) Accounts payable and accrued liabilities 26,841 83,384 1,043 Income taxes payable (594 ) 1,697 (25,599 ) Current deferred income tax liabilities — — 1,099 Net decrease (increase) in noncash operating working capital $ (36,954 ) $ 53,726 $ (46,586 )

Assets and Liabilities Measur41

Assets and Liabilities Measure at Fair Value (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Schedule of Carrying Amounts and Estimated Fair Value of Financial Instruments	The following table presents the carrying amounts and estimated fair values of financial instruments held by the Company at December 31, 2017 and 2016 . The fair value of a financial instrument is the amount at which the instrument could be exchanged in a current transaction between willing parties. The table excludes Cash and cash equivalents, Accounts receivable-trade, and Trade accounts payable and accrued liabilities, all of which had fair values approximating carrying amounts. The fair value of Current and Long-term debt was estimated based on rates offered to the Company at that time for debt of the same maturities. The Company has off-balance sheet exposures relating to certain financial guarantees and letters of credit. The fair value of these, which represents fees associated with obtaining the instruments, was nominal. December 31, 2017 December 31, 2016 Carrying Carrying (Thousands of dollars) Amount Fair Value Amount Fair Value Financial liabilities Current and long-term debt $ (880,751 ) $ (904,931 ) $ (670,218 ) $ (690,114 )

Business Segments (Tables)

Business Segments (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Summary of Information by Business Segment	Segment Information Corporate and Discontinued (Thousands of dollars) Marketing Other Assets Operations Consolidated Year ended December 31, 2017 Segment income (loss) $ 295,322 (50,058 ) — $ 245,264 Revenues from external customers 12,826,228 325 — 12,826,553 Interest income — 1,309 — 1,309 Interest expense (83 ) (46,577 ) — (46,660 ) Income tax expense (benefit) (2,923 ) (2,319 ) — (5,242 ) Significant noncash charges (credits) Depreciation and amortization 110,530 6,436 — 116,966 Accretion of asset retirement obligations 1,785 — — 1,785 Deferred and noncurrent income taxes (benefits) (61,299 ) 10,888 — (50,411 ) Additions to property, plant and equipment 234,029 39,693 — 273,722 Total assets at year-end $ 2,023,376 307,663 — $ 2,331,039 Year ended December 31, 2016 Segment income (loss) $ 249,790 (28,298 ) — $ 221,492 Revenues from external customers 11,594,311 242 — 11,594,553 Interest income — 578 — 578 Interest expense (53 ) (39,651 ) — (39,704 ) Income tax expense (benefit) 147,217 (16,678 ) — 130,539 Significant noncash charges (credits) Depreciation and amortization 92,242 6,368 — 98,610 Accretion of asset retirement obligations 1,650 — — 1,650 Deferred and noncurrent income taxes (benefits) 51,290 (10,883 ) — 40,407 Additions to property, plant and equipment 239,095 24,761 — 263,856 Total assets at year-end $ 1,858,055 230,685 — $ 2,088,740 Year ended December 31, 2015 Segment income (loss) $ 159,796 (22,205 ) 38,749 $ 176,340 Revenues from external customers 12,699,124 287 — 12,699,411 Interest income — 2,177 — 2,177 Interest expense (20 ) (33,511 ) — (33,531 ) Income tax expense (benefit) 95,657 (14,959 ) — 80,698 Significant noncash charges (credits) Depreciation and amortization 81,349 5,219 — 86,568 Accretion of asset retirement obligations 1,521 — — 1,521 Deferred and noncurrent income taxes (benefits) 42,593 (2,037 ) — 40,556 Additions to property, plant and equipment 202,371 9,477 3,720 215,568 Total assets at year-end $ 1,727,131 159,110 — $ 1,886,241

Guarantor Subsidiaries (Tables)

Guarantor Subsidiaries (Tables)	12 Months Ended
	Dec. 31, 2017
Guarantor Subsidiaries [Abstract]
Consolidating Balance Sheet	CONSOLIDATING BALANCE SHEET (Thousands of dollars) December 31, 2017 Assets Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Current assets Cash and cash equivalents $ — $ 169,978 $ 50 $ — $ — $ 170,028 Accounts receivable—trade, less allowance for doubtful accounts of $1,094 in 2017 — 225,268 — — — 225,268 Inventories, at lower of cost or market — 182,477 — — — 182,477 Prepaid expenses and other current assets — 36,507 14 — — 36,521 Total current assets — 614,230 64 — — 614,294 Property, plant and equipment, at cost less accumulated depreciation and amortization of $874,675 in 2017 — 1,678,298 1,172 — — 1,679,470 Investments in subsidiaries 2,223,374 144,898 — — (2,368,272 ) — Other assets — 37,275 — — — 37,275 Total assets $ 2,223,374 $ 2,474,701 $ 1,236 $ — $ (2,368,272 ) $ 2,331,039 Liabilities and Stockholders' Equity Current liabilities Current maturities of long-term debt $ — $ 19,887 $ — $ — $ — $ 19,887 Inter-company accounts payable 829,202 (624,065 ) (50,799 ) (154,338 ) — — Trade accounts payable and accrued liabilities — 513,471 (7 ) — — 513,464 Income taxes payable — — — — — — Total current liabilities 829,202 (90,707 ) (50,806 ) (154,338 ) — 533,351 Long-term debt, including capitalized lease obligations — 860,864 — — — 860,864 Deferred income taxes — 154,245 — — — 154,245 Asset retirement obligations — 28,159 — — — 28,159 Deferred credits and other liabilities — 16,018 — — — 16,018 Total liabilities 829,202 968,579 (50,806 ) (154,338 ) — 1,592,637 Stockholders' Equity Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding) — — — — — — Common Stock, par $0.01 (authorized 200,000,000 shares, 46,767,164 shares issued at December 31, 2017) 468 1 60 — (61 ) 468 Treasury stock (12,675,630 shares held at December 31, 2017) (806,511 ) — — — — (806,511 ) Additional paid in capital (APIC) 1,205,680 573,065 52,004 87,543 (1,368,382 ) 549,910 Retained earnings 994,535 933,056 (22 ) 66,795 (999,829 ) 994,535 Total stockholders' equity 1,394,172 1,506,122 52,042 154,338 (2,368,272 ) 738,402 Total liabilities and stockholders' equity $ 2,223,374 $ 2,474,701 $ 1,236 $ — $ (2,368,272 ) $ 2,331,039 CONSOLIDATING BALANCE SHEET (Thousands of dollars) December 31, 2016 Assets Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Current assets Cash and cash equivalents $ — $ 153,813 $ — $ — $ — $ 153,813 Accounts receivable—trade, less allowance for doubtful accounts of $1,891 in 2016 — 183,519 — — — 183,519 Inventories, at lower of cost or market — 153,351 — — — 153,351 Prepaid expenses and other current assets — 24,871 — — — 24,871 Total current assets — 515,554 — — — 515,554 Property, plant and equipment, at cost less accumulated depreciation and amortization of $780,426 in 2016 — 1,532,655 — — — 1,532,655 Investments in subsidiaries 1,978,110 144,917 — — (2,123,027 ) — Other assets — 40,531 — — — 40,531 Total assets $ 1,978,110 $ 2,233,657 $ — $ — $ (2,123,027 ) $ 2,088,740 Liabilities and Stockholders' Equity Current liabilities Current maturities of long-term debt $ — $ 40,596 $ — $ — $ — $ 40,596 Inter-company accounts payable 623,316 (416,914 ) (52,064 ) (154,338 ) — — Trade accounts payable and accrued liabilities — 473,370 — — — 473,370 Income taxes payable — 591 3 — — 594 Total current liabilities 623,316 97,643 (52,061 ) (154,338 ) — 514,560 Long-term debt, including capitalized lease obligations — 629,622 — — — 629,622 Deferred income taxes — 204,656 — — — 204,656 Asset retirement obligations — 26,200 — — — 26,200 Deferred credits and other liabilities — 16,626 — — — 16,626 Total liabilities 623,316 974,747 (52,061 ) (154,338 ) — 1,391,664 Stockholders' Equity Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding) — — — — — — Common Stock, par $0.01 (authorized 200,000,000 shares, 46,767,164 shares issued at December 31, 2016) 468 1 60 — (61 ) 468 Treasury stock (9,831,196 shares held at December 31, 2016) (608,001 ) — — — — (608,001 ) Additional paid in capital (APIC) 1,213,056 571,117 52,004 87,543 (1,368,382 ) 555,338 Retained earnings 749,271 687,792 (3 ) 66,795 (754,584 ) 749,271 Total stockholders' equity 1,354,794 1,258,910 52,061 154,338 (2,123,027 ) 697,076 Total liabilities and stockholders' equity $ 1,978,110 $ 2,233,657 $ — $ — $ (2,123,027 ) $ 2,088,740
Consolidating Income Statement	CONSOLIDATING INCOME STATEMENT (Thousands of dollars) Year ended December 31, 2017 Operating Revenues Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Petroleum product sales $ — $ 10,287,856 $ — $ — $ — $ 10,287,856 Merchandise sales — 2,372,658 — — — 2,372,658 Other operating revenues — 166,037 2 — — 166,039 Total operating revenues — 12,826,551 2 — — 12,826,553 Operating expenses Petroleum product cost of goods sold — 9,773,211 — — — 9,773,211 Merchandise cost of goods sold — 1,991,404 — — — 1,991,404 Station and other operating expenses — 514,866 7 — — 514,873 Depreciation and amortization — 116,942 24 — — 116,966 Selling, general and administrative — 141,170 1 — — 141,171 Accretion of asset retirement obligations — 1,785 — — — 1,785 Total operating expenses — 12,539,378 32 — — 12,539,410 Gain (loss) on sale of assets — (3,950 ) — — — (3,950 ) Income from operations — 283,223 (30 ) — — 283,193 Other income (expense) Interest income — 1,309 — — — 1,309 Interest expense — (46,660 ) — — — (46,660 ) Other nonoperating income — 2,180 — — — 2,180 Total other income (expense) — (43,171 ) — — — (43,171 ) Income from continuing operations before income taxes — 240,052 (30 ) — — 240,022 Income tax expense (benefit) — (5,231 ) (11 ) — — (5,242 ) Income (loss) — 245,283 (19 ) — — 245,264 Income (loss) from discontinued operations, net of income taxes — — — — — — Equity earnings in affiliates, net of tax 245,264 (19 ) — — (245,245 ) — Net Income (Loss) $ 245,264 $ 245,264 $ (19 ) $ — $ (245,245 ) $ 245,264 CONSOLIDATING INCOME STATEMENT (Thousands of dollars) Year ended December 31, 2016 Operating Revenues Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Petroleum product sales $ — $ 9,070,623 $ — $ — $ — $ 9,070,623 Merchandise sales — 2,338,586 — — — 2,338,586 Ethanol sales and other — 185,344 — — — 185,344 Total operating revenues — 11,594,553 — — — 11,594,553 Operating Expenses Petroleum product cost of goods sold — 8,603,953 — — — 8,603,953 Merchandise cost of goods sold — 1,974,486 — — — 1,974,486 Station and other operating expenses — 493,320 — — — 493,320 Depreciation and amortization — 98,610 — — — 98,610 Selling, general and administrative — 122,668 1 — — 122,669 Accretion of asset retirement obligations — 1,650 — — — 1,650 Total operating expenses — 11,294,687 1 — — 11,294,688 Gain (loss) on sale of assets — 88,212 — — — 88,212 Income from operations — 388,078 (1 ) — — 388,077 Other income (expense) Interest income — 578 — — — 578 Interest expense — (39,704 ) — — — (39,704 ) Other nonoperating income — 3,080 — — — 3,080 Total other income (expense) — (36,046 ) — — — (36,046 ) Income from continuing operations before income taxes — 352,032 (1 ) — — 352,031 Income tax expense (benefit) — 130,539 — — — 130,539 Income from continuing operations — 221,493 (1 ) — — 221,492 Income (loss) from discontinued operations, net of income taxes — — — — — — Equity earnings in affiliates, net of tax 221,492 (1 ) — — (221,491 ) — Net Income $ 221,492 $ 221,492 $ (1 ) $ — $ (221,491 ) $ 221,492 CONSOLIDATING INCOME STATEMENT (Thousands of dollars) Year ended December 31, 2015 Operating Revenues Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Petroleum product sales $ — $ 10,424,855 $ — $ — $ (120,166 ) $ 10,304,689 Merchandise sales — 2,273,888 — — — 2,273,888 Ethanol sales and other — 120,834 — — — 120,834 Total operating revenues — 12,819,577 — — (120,166 ) 12,699,411 Operating expenses Petroleum product cost of goods sold — 9,914,641 — — (120,166 ) 9,794,475 Merchandise cost of goods sold — 1,946,423 — — — 1,946,423 Station and other operating expenses — 486,383 — — — 486,383 Depreciation and amortization — 86,568 — — — 86,568 Selling, general and administrative — 129,276 1 — — 129,277 Accretion of asset retirement obligations — 1,521 — — — 1,521 Total operating expenses — 12,564,812 1 — (120,166 ) 12,444,647 Gain (loss) on sale of assets — (4,658 ) — — — (4,658 ) Income from operations — 250,107 (1 ) — — 250,106 Other income (expense) Interest income — 2,177 — — — 2,177 Interest expense — (33,531 ) — — — (33,531 ) Other nonoperating income — (463 ) — — — (463 ) Total other income (expense) — (31,817 ) — — — (31,817 ) Income from continuing operations before income taxes — 218,290 (1 ) — — 218,289 Income tax expense (benefit) — 80,698 — — — 80,698 Income from continuing operations — 137,592 (1 ) — — 137,591 Income from discontinued operations, net of income taxes — — — 38,749 — 38,749 Equity earnings in affiliates, net of tax 176,340 (22,731 ) — (61,479 ) (92,130 ) — Net Income $ 176,340 $ 114,861 $ (1 ) $ (22,730 ) $ (92,130 ) $ 176,340
Consolidating Statement of Cash Flow	CONSOLIDATING STATEMENT OF CASH FLOWS (Thousands of dollars) Year ended December 31, 2017 Operating Activities Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net income (loss) $ 245,264 $ 245,264 $ (19 ) $ — $ (245,245 ) $ 245,264 Adjustments to reconcile net income (loss) to net cash provided by operating activities Income from discontinued operations, net of tax — — — — — — Depreciation and amortization — 116,942 24 — — 116,966 Deferred and noncurrent income tax charges (benefits) — (50,411 ) — — — (50,411 ) Accretion of asset retirement obligations — 1,785 — — — 1,785 (Gain) loss from sale of assets — 3,950 — — — 3,950 Net decrease (increase) in noncash operating working capital — (36,933 ) (21 ) — — (36,954 ) Equity in earnings (245,264 ) 19 — — 245,245 — Other operating activities - net — 3,025 — — — 3,025 Net cash provided by (required by) operating activities — 283,641 (16 ) — — 283,625 Investing Activities Property additions — (257,062 ) (1,195 ) — — (258,257 ) Proceeds from sale of assets — 887 — — — 887 Changes in restricted cash — — — — — — Other investing activities - net — (4,737 ) — — — (4,737 ) Sales proceeds — — — — — — Other — — — — — — Net cash provided by (required by) investing activities — (260,912 ) (1,195 ) — — (262,107 ) Financing Activities Purchase of treasury stock (205,992 ) — — — — (205,992 ) Repayments of long-term debt — (131,412 ) — — — (131,412 ) Additions to long-term debt — 338,750 — — — 338,750 Debt issuance costs — (1,100 ) — — — (1,100 ) Amounts related to share-based compensation — (5,549 ) — — — (5,549 ) Net distributions to parent 205,992 (207,253 ) 1,261 — — — Net cash provided by (required by) financing activities — (6,564 ) 1,261 — — (5,303 ) Net change in cash and cash equivalents — 16,165 50 — — 16,215 Cash and cash equivalents at January 1 — 153,813 — — — 153,813 Cash and cash equivalents at December 31 $ — $ 169,978 $ 50 $ — $ — $ 170,028 Less: Cash and cash equivalents held for sale — — — — — — Cash and cash equivalents of continuing operations at December 31 $ — $ 169,978 $ 50 $ — $ — $ 170,028 CONSOLIDATING STATEMENT OF CASH FLOWS (Thousands of dollars) Year ended December 31, 2016 Operating Activities Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net income (loss) $ 221,492 $ 221,492 $ (1 ) $ — $ (221,491 ) $ 221,492 Adjustments to reconcile net income (loss) to net cash provided by operating activities Income from discontinued operations, net of tax — — — — — — Depreciation and amortization — 98,610 — — — 98,610 Deferred and noncurrent income tax charges (credits) — 40,407 — — — 40,407 Accretion of asset retirement obligations — 1,650 — — — 1,650 Pretax gains from sale of assets — (88,212 ) — — — (88,212 ) Net decrease (increase) in noncash operating working capital — 53,726 — — — 53,726 Equity in earnings (221,492 ) 1 — — 221,491 — Other operating activities - net — 9,767 — — — 9,767 Net cash provided by (used in) continuing operations — 337,441 (1 ) — — 337,440 Net cash provided by discontinued operations — — — — — — Net cash provided by (used in) operating activities — 337,441 (1 ) — — 337,440 Investing Activities Property additions — (262,144 ) — — — (262,144 ) Proceeds from sale of assets — 85,327 — — — 85,327 Changes in restricted cash — 68,571 — — — 68,571 Other investing activities - net — (28,963 ) — — — (28,963 ) Sales proceeds — — — — — — Other — 2,355 — — — 2,355 Net cash provided by (required by) investing activities — (134,854 ) — — — (134,854 ) Financing Activities Purchase of treasury stock (323,272 ) — — — — (323,272 ) Repayments of long-term debt — (20,438 ) — — — (20,438 ) Additions to long-term debt — 200,000 — — — 200,000 Debt issuance costs — (3,240 ) — — — (3,240 ) Amounts related to share-based compensation — (4,158 ) — — — (4,158 ) Net distributions to parent 323,272 (323,273 ) 1 — — — Net cash provided by (required by) financing activities — (151,109 ) 1 — — (151,108 ) Net change in cash and cash equivalents — 51,478 — — — 51,478 Cash and cash equivalents at January 1 — 102,335 — — — 102,335 Cash and cash equivalents at December 31 $ — $ 153,813 $ — $ — $ — $ 153,813 Less: Cash and cash equivalents held for sale — — — — — — Cash and cash equivalents of continuing operations at December 31 $ — $ 153,813 $ — $ — $ — $ 153,813 CONSOLIDATING STATEMENT OF CASH FLOWS (Thousands of dollars) Year ended December 31, 2015 Operating Activities Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net income (loss) $ 176,340 $ 114,861 $ (1 ) $ (22,730 ) $ (92,130 ) $ 176,340 Adjustments to reconcile net income (loss) to net cash provided by operating activities Income from discontinued operations, net of tax — — — (38,749 ) — (38,749 ) Depreciation and amortization — 86,568 — — — 86,568 Deferred and noncurrent income tax charges (credits) — 40,556 — — — 40,556 Accretion of asset retirement obligations — 1,521 — — — 1,521 Pretax gains from sale of assets — 4,658 — — — 4,658 Net decrease (increase) in noncash operating working capital — (46,586 ) — — — (46,586 ) Equity in earnings (176,340 ) 22,731 — 61,479 92,130 — Other operating activities - net — 9,417 — — — 9,417 Net cash provided by (used in) continuing operations — 233,726 (1 ) — — 233,725 Net cash provided by discontinued operations — — — (17,887 ) — (17,887 ) Net cash provided by (used in) operating activities — 233,726 (1 ) (17,887 ) — 215,838 Investing Activities Property additions — (205,225 ) — — — (205,225 ) Proceeds from sale of assets — 729 — — — 729 Changes in restricted cash — (68,571 ) — — — (68,571 ) Other investing activities - net — (2,889 ) — — — (2,889 ) Sales proceeds — — — 93,765 — 93,765 Other — — — (7,443 ) — (7,443 ) Net cash provided by (required by) investing activities — (275,956 ) — 86,322 — (189,634 ) Financing Activities Purchase of treasury stock (248,695 ) — — — — (248,695 ) Repayments of long-term debt — (146 ) — — — (146 ) Additions to long-term debt — — — — — — Debt issuance costs — (58 ) — — — (58 ) Amounts related to share-based compensation — (3,075 ) — — — (3,075 ) Net distributions to parent 248,695 (179,319 ) 1 (69,377 ) — — Net cash provided by (required by) financing activities — (182,598 ) 1 (69,377 ) — (251,974 ) Net change in cash and cash equivalents — (224,828 ) — (942 ) — (225,770 ) Cash and cash equivalents at January 1 — 327,163 — 942 — 328,105 Cash and cash equivalents at December 31 $ — $ 102,335 $ — $ — $ — $ 102,335 Less: Cash and cash equivalents held for sale — — — — — — Cash and cash equivalents of continuing operations at December 31 $ — $ 102,335 $ — $ — $ — $ 102,335
Consolidating Statement of Changes in Equity	CONSOLIDATING STATEMENT OF CHANGES IN EQUITY (Thousands of dollars) Year ended December 31, 2017 Statement of Stockholders' Equity Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Common Stock Balance as of December 31, 2016 $ 468 $ 1 $ 60 $ — $ (61 ) $ 468 Issuance of common stock — — — — — — Balance as of December 31, 2017 $ 468 $ 1 $ 60 $ — $ (61 ) $ 468 Treasury Stock Balance as of December 31, 2016 $ (608,001 ) $ — $ — $ — $ — $ (608,001 ) Issuance of common stock 7,482 — — — — 7,482 Repurchase of common stock (205,992 ) — — — — (205,992 ) Balance as of December 31, 2017 $ (806,511 ) $ — $ — $ — $ — $ (806,511 ) APIC Balance as of December 31, 2016 $ 1,213,056 $ 571,117 $ 52,004 $ 87,543 $ (1,368,382 ) $ 555,338 Issuance of common stock (7,374 ) — — — — (7,374 ) Amounts related to share-based compensation — (5,549 ) — — — (5,549 ) Share-based compensation expense — 7,495 — — — 7,495 Balance as of December 31, 2017 $ 1,205,682 $ 573,063 $ 52,004 $ 87,543 $ (1,368,382 ) $ 549,910 Retained Earnings Balance as of December 31, 2016 $ 749,271 $ 687,792 $ (3 ) $ 66,795 $ (754,584 ) $ 749,271 Net income 245,264 245,264 (19 ) — (245,245 ) 245,264 Balance as of December 31, 2017 $ 994,535 $ 933,056 $ (22 ) $ 66,795 $ (999,829 ) $ 994,535 CONSOLIDATING STATEMENTS OF CHANGES IN EQUITY (Thousands of dollars) Year ended December 31, 2016 Statement of Stockholders' Equity Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Common Stock Balance as of December 31, 2015 $ 468 $ 1 $ 60 $ — $ (61 ) $ 468 Issuance of common stock — — — — — — Balance as of December 31, 2016 $ 468 $ 1 $ 60 $ — $ (61 ) $ 468 Treasury Stock Balance as of December 31, 2015 $ (294,139 ) $ — $ — $ — $ — $ (294,139 ) Issuance of common stock 9,410 — — — — 9,410 Repurchase of common stock (323,272 ) — — — — (323,272 ) Balance as of December 31, 2016 $ (608,001 ) $ — $ — $ — $ — $ (608,001 ) APIC Balance as of December 31, 2015 $ 1,222,466 $ 564,551 $ 52,004 $ 87,543 $ (1,368,382 ) $ 558,182 Issuance of common stock (9,410 ) — — — — (9,410 ) Amounts related to share-based compensation — (2,748 ) — — — (2,748 ) Reclassification of equity — — — — — — Share-based compensation expense — 9,314 — — — 9,314 Balance as of December 31, 2016 $ 1,213,056 $ 571,117 $ 52,004 $ 87,543 $ (1,368,382 ) $ 555,338 Retained Earnings Balance as of December 31, 2015 $ 527,779 $ 466,300 $ (2 ) $ 66,795 $ (533,093 ) $ 527,779 Net income 221,492 221,492 (1 ) — (221,491 ) 221,492 Balance as of December 31, 2016 $ 749,271 $ 687,792 $ (3 ) $ 66,795 $ (754,584 ) $ 749,271 CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Thousands of dollars) Year ended December 31, 2015 Statement of Stockholders' Equity Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Common Stock Balance as of December 31, 2014 $ 468 $ 1 $ 60 $ — $ (61 ) $ 468 Issuance of common stock — — — — — — Balance as of December 31, 2015 $ 468 $ 1 $ 60 $ — $ (61 ) $ 468 Treasury Stock Balance as of December 31, 2014 $ (51,073 ) $ — $ — $ — $ — $ (51,073 ) Issuance of common stock 5,629 — — — — 5,629 Repurchase of common stock (248,695 ) — — — — (248,695 ) Balance as of December 31, 2015 $ (294,139 ) $ — $ — $ — $ — $ (294,139 ) APIC Balance as of December 31, 2014 $ 1,228,095 $ 558,611 $ 52,004 $ 35,677 $ (1,316,516 ) $ 557,871 Issuance of common stock (5,629 ) — — — — (5,629 ) Amounts related to share-based compensation — (3,075 ) — 51,866 (51,866 ) (3,075 ) Share-based compensation expense — 9,015 — — — 9,015 Balance as of December 31, 2015 $ 1,222,466 $ 564,551 $ 52,004 $ 87,543 $ (1,368,382 ) $ 558,182 Retained Earnings Balance as of December 31, 2014 $ 351,439 $ 351,439 $ (1 ) $ 89,525 $ (440,963 ) $ 351,439 Net income 176,340 114,861 (1 ) (22,730 ) (92,130 ) 176,340 Balance as of December 31, 2015 $ 527,779 $ 466,300 $ (2 ) $ 66,795 $ (533,093 ) $ 527,779

Supplemental Quarterly Inform44

Supplemental Quarterly Information (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information	First Second Third Fourth (Millions of dollars except per share amounts) Quarter Quarter Quarter Quarter Year Year Ended December 31, 2017 Sales and other operating revenues $ 2,999.6 $ 3,211.1 $ 3,236.3 $ 3,379.5 $ 12,826.6 Income (loss) from continuing operations before income taxes $ (9.8 ) $ 89.9 $ 108.7 $ 51.2 $ 240.0 Income (loss) from continuing operations $ (3.0 ) $ 55.5 $ 67.9 $ 124.9 $ 245.3 Net income (loss) $ (3.0 ) $ 55.5 $ 67.9 $ 124.9 $ 245.3 Income (loss) from continuing operations (per Common share) Basic $ (0.08 ) $ 1.52 $ 1.92 $ 3.62 $ 6.85 Diluted $ (0.08 ) $ 1.51 $ 1.90 $ 3.58 $ 6.78 Net income (loss) (per Common share) Basic $ (0.08 ) $ 1.52 $ 1.92 $ 3.62 $ 6.85 Diluted $ (0.08 ) $ 1.51 $ 1.90 $ 3.58 $ 6.78 Market price of Common stock 1 High $ 73.42 $ 74.49 $ 76.85 $ 81.00 $ 81.00 Low $ 61.03 $ 65.00 $ 64.24 $ 69.11 $ 61.03 Year Ended December 31, 2016 Sales and other operating revenues $ 2,490.3 $ 3,005.8 $ 3,042.7 $ 3,055.8 $ 11,594.6 Income (loss) from continuing operations before income taxes $ 139.3 $ 74.1 $ 71.8 $ 66.8 $ 352.0 Income (loss) from continuing operations $ 85.9 $ 46.3 $ 45.5 $ 43.8 $ 221.5 Net income (loss) $ 85.9 $ 46.3 $ 45.5 $ 43.8 $ 221.5 Income (loss) from continuing operations (per Common share) Basic $ 2.10 $ 1.18 $ 1.17 $ 1.16 $ 5.64 Diluted $ 2.08 $ 1.17 $ 1.16 $ 1.14 $ 5.59 Net income (loss) (per Common share) Basic $ 2.10 $ 1.18 $ 1.17 $ 1.16 $ 5.64 Diluted $ 2.08 $ 1.17 $ 1.16 $ 1.14 $ 5.59 Market price of Common stock 1 High $ 67.18 $ 74.16 $ 79.29 $ 72.56 $ 79.29 Low $ 54.24 $ 57.42 $ 70.08 $ 57.80 $ 54.24 1 Prices as quoted on the New York Stock Exchange.

Description of Business and B45

Description of Business and Basis of Presentation (Details)	Aug. 31, 2013	Aug. 30, 2013	Dec. 31, 2017statestore
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Percentage of shares of stock distributed		100.00%
Ownership interest after transaction (percent)	0.00%
Number of states in which entity operates | state			26
Number of stores | store			1,446

Significant Accounting Polici46

Significant Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Excise taxes	$ 1,973,112	$ 1,961,478	$ 1,968,629
Property, Plant and Equipment [Line Items]
Interest costs capitalized	$ 3,800	$ 300
LKE transaction, required term to facilitate forward agreement before proceeds are reclassified as available cash (in days)	180 days
Pipeline and terminal facilities [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life (in years)	16 years
Pipeline and terminal facilities [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life (in years)	25 years
Marketing Facilities [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life (in years)	3 years
Marketing Facilities [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life (in years)	50 years
Nonqualified Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	3 years
Restricted Stock And Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	3 years

Discontinued Operations (Summar

Discontinued Operations (Summary of Results of Operations of Hereford) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Expenses
Net income	$ 0	$ 0	$ 38,749
Discontinued Operations, Disposed of by Sale [Member] | Hereford Production Facility [Member]
Operating Revenues
Ethanol sales			154,502
Total operating revenues			154,502
Operating Expenses
Ethanol cost of goods sold			121,753
Station and other operating expenses			27,881
Depreciation and amortization			333
Selling, general and administrative expenses			1,382
Total operating expenses			151,349
Gain (loss) on sale of assets			60,782
Income from operations before taxes			63,935
Income taxes			25,186
Net income			$ 38,749

Discontinued Operations (Cash F

Discontinued Operations (Cash Flow Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net Cash Provided by (Used in) Discontinued Operations [Abstract]
Net cash provided by (used in) discontinued operating activities	$ 0	$ 0	$ (17,887)
Discontinued Operations, Disposed of by Sale [Member] | Hereford Production Facility [Member]
Net Cash Provided by (Used in) Discontinued Operations [Abstract]
Net cash provided by (used in) discontinued operating activities			(17,887)
Net cash provided by (used in) discontinued investing activities			$ 86,322

Inventories (Summary Of Invento

Inventories (Summary Of Inventory) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Finished products - FIFO basis	$ 231,927	$ 207,903
Less LIFO reserve - finished products	(167,201)	(153,319)
Finished products - LIFO basis	64,726	54,584
Store merchandise for resale	104,789	95,649
Materials and supplies	12,962	3,118
Total inventories	$ 182,477	$ 153,351

Inventories (Narrative) (Detail

Inventories (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Excess of LIFO replacement cost over carrying value	$ 167.2	$ 153.3

Property, Plant and Equipment51

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Cost	$ 2,554,145	$ 2,313,081
Net	1,679,470	1,532,655
Depreciation expense	115,000	97,000	$ 86,000
Land [Member]
Property, Plant and Equipment [Line Items]
Cost	586,502	577,743
Net	586,502	577,743
Pipeline and terminal facilities [Member]
Property, Plant and Equipment [Line Items]
Cost	72,019	67,946
Net	42,975	41,218
Retail gasoline stations [Member]
Property, Plant and Equipment [Line Items]
Cost	1,752,555	1,565,275
Net	968,900	867,165
Buildings [Member]
Property, Plant and Equipment [Line Items]
Cost	54,584	33,375
Net	42,898	22,310
Other [Member]
Property, Plant and Equipment [Line Items]
Cost	88,485	68,742
Net	$ 38,195	$ 24,219
Minimum [Member] | Pipeline and terminal facilities [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	16 years
Minimum [Member] | Retail gasoline stations [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	3 years
Minimum [Member] | Buildings [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	20 years
Minimum [Member] | Other [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	3 years
Maximum [Member] | Pipeline and terminal facilities [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	25 years
Maximum [Member] | Retail gasoline stations [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	50 years
Maximum [Member] | Buildings [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	45 years
Maximum [Member] | Other [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	20 years

Accounts Payable And Accrued 52

Accounts Payable And Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Trade accounts payable	$ 339,606	$ 309,988
Excise taxes/withholdings payable	89,454	76,552
Accrued insurance obligations	21,404	21,631
Accrued taxes other than income	25,282	26,740
Other	37,718	38,459
Accounts payable and accrued liabilities	$ 513,464	$ 473,370

Long-Term Debt (Summary of Long

Long-Term Debt (Summary of Long-Term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Apr. 25, 2017	Dec. 31, 2016	Aug. 14, 2013
Debt Instrument [Line Items]
Capitalized lease obligations, vehicles, due through 2021	$ 2,359		$ 1,451
Unamortized debt issuance costs	(5,155)		(5,407)
Total long-term debt	880,751		670,218
Less current maturities	19,887		40,596
Long-term debt	860,864		629,622
Senior Notes [Member] | 6.00% senior notes due 2023 [Member]
Debt Instrument [Line Items]
Long-term debt	495,043		494,174
6.00% senior notes due 2023 (net of unamortized discount of $4,957 at 2017 and $5,826 at 2016)	$ 4,957		$ 5,826
Interest rate (percent)	6.00%		6.00%	6.00%
Senior Notes [Member] | 5.625% senior notes due 2027 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 296,504		$ 0
6.00% senior notes due 2023 (net of unamortized discount of $4,957 at 2017 and $5,826 at 2016)	$ 3,496
Interest rate (percent)	5.625%	5.625%	0.00%
Secured Debt [Member] | Term loan due 2020 [Member] | Term Facility [Member]
Debt Instrument [Line Items]
Long-term debt	$ 92,000		$ 180,000
Term loan due 2020 (effective rate of 4.15% at December 31, 2017)	4.15%

Long-Term Debt (Narrative) (Det

Long-Term Debt (Narrative) (Details)	Dec. 31, 2017USD ($)	Mar. 10, 2016USD ($)	Dec. 31, 2017USD ($)	Apr. 25, 2017USD ($)	Dec. 31, 2016	Aug. 30, 2013USD ($)	Aug. 14, 2013USD ($)
Debt Instrument [Line Items]
Fixed charge coverage ratio	0.67		0.67
Fixed charge coverage ratio threshold, percentage of aggregate facility commitments and borrowing base	17.50%		17.50%
Fixed charge coverage ratio threshold, amount of aggregate facility commitments and borrowing base			$ 70,000,000
Secured debt to EBITDA ratio	0.23		0.23
Dividend restrictions description			The credit agreement contains restrictions on certain payments, including dividends, when availability under the credit agreement is less than or equal to the greater of $100 million and 25% of the lesser of the revolving commitments and the borrowing base and our fixed charge coverage ratio is less than 1.0 to 1.0 (unless availability under the credit agreement is greater than $100 million and 40% of the lesser of the revolving commitments and the borrowing base).  As of December 31, 2017, our ability to make restricted payments was not limited as our availability under the borrowing base was more than $100 million, while our fixed charge coverage ratio under our credit agreement was less than 1.0 to 1.0. As of December 31, 2016, the Company had a shortfall of approximately $304.1 million of our net income and retained earnings subject to such restrictions before the fixed charge coverage ratio would exceed 1.0 to 1.0.
Net income and retained earnings free of restrictions, excess (deficit) of	$ (206,900,000)		$ (206,900,000)
Minimum [Member]
Debt Instrument [Line Items]
Fixed charge coverage ratio	1		1
Period for fixed charge coverage ratio threshold (in days)			3 days
Dividend restriction threshold as amount of availability	$ 100,000,000		$ 100,000,000
Dividend restriction threshold as a percentage of revolving commitments and borrowing base	25.00%		25.00%
Maximum [Member]
Debt Instrument [Line Items]
Secured debt to EBITDA ratio	4.5		4.5
Dividend restriction threshold as a percentage of revolving commitments and borrowing base with consideration of fixed charge coverage ratio	40.00%		40.00%
Dividend restriction threshold as amount of availability with consideration of fixed charge coverage ratio	$ 100,000,000		$ 100,000,000
Federal Funds Rate [Member]
Debt Instrument [Line Items]
Spread over variable rate (percent)			0.50%
LIBOR [Member]
Debt Instrument [Line Items]
Spread over variable rate (percent)			1.00%
Interest period one (in months)			1 month
Interest period two (in months)			2 months
Interest period three (in months)			3 months
Interest period four (in months)			6 months
Cash [Member]
Debt Instrument [Line Items]
Percentage of asset available to borrow against	100.00%		100.00%
Credit Card Receivables [Member]
Debt Instrument [Line Items]
Percentage of asset available to borrow against	90.00%		90.00%
Investment Grade Accounts [Member]
Debt Instrument [Line Items]
Percentage of asset available to borrow against	90.00%		90.00%
Other Accounts [Member]
Debt Instrument [Line Items]
Percentage of asset available to borrow against	85.00%		85.00%
Midstream Refined Products Inventory [Member]
Debt Instrument [Line Items]
Percentage of asset available to borrow against	80.00%		80.00%
Refined Retail Products Inventory [Member]
Debt Instrument [Line Items]
Percentage of asset available to borrow against	75.00%		75.00%
Retail Merchandise Inventory [Member]
Debt Instrument [Line Items]
Percentage of asset available to borrow against	70.00%		70.00%
Percentage of net orderly liquidation value available to borrow against	85.00%		85.00%
Secured Debt [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity						$ 450,000,000
Debt outstanding	$ 0		$ 0
Secured Debt [Member] | LIBOR [Member] | Minimum [Member]
Debt Instrument [Line Items]
Spread over variable rate (percent)			1.50%
Secured Debt [Member] | LIBOR [Member] | Maximum [Member]
Debt Instrument [Line Items]
Spread over variable rate (percent)			2.00%
Secured Debt [Member] | Alternative Base Rate [Member] | Minimum [Member]
Debt Instrument [Line Items]
Spread over variable rate (percent)			0.50%
Secured Debt [Member] | Alternative Base Rate [Member] | Maximum [Member]
Debt Instrument [Line Items]
Spread over variable rate (percent)			1.00%
Term Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 200,000,000				150,000,000
Principal payment period	5,000,000	10,000,000
Term Facility [Member] | LIBOR [Member] | Minimum [Member]
Debt Instrument [Line Items]
Spread over variable rate (percent)			2.50%
Term Facility [Member] | LIBOR [Member] | Maximum [Member]
Debt Instrument [Line Items]
Spread over variable rate (percent)			2.75%
Term Facility [Member] | Alternative Base Rate [Member] | Minimum [Member]
Debt Instrument [Line Items]
Spread over variable rate (percent)			1.50%
Term Facility [Member] | Alternative Base Rate [Member] | Maximum [Member]
Debt Instrument [Line Items]
Spread over variable rate (percent)			1.75%
Incremental Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 150,000,000				$ 200,000,000
Letter Of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, sublimit	$ 200,000,000		$ 200,000,000
Senior Notes [Member] | 6.00% senior notes due 2023 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	6.00%		6.00%		6.00%		6.00%
Senior notes							$ 500,000,000
Senior Notes [Member] | 5.625% senior notes due 2027 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	5.625%		5.625%	5.625%	0.00%
Senior notes				$ 300,000,000

Asset Retirement Obligations 55

Asset Retirement Obligations (ARO) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Asset Retirement Obligation Roll Forward
Balance at beginning of period	$ 26,200	$ 24,345
Accretion expense	1,785	1,650	$ 1,521
Settlements of liabilities	(277)	(174)
Liabilities incurred	451	379
Balance at end of period	$ 28,159	$ 26,200	$ 24,345

Income Taxes (Schedule Of Compo

Income Taxes (Schedule Of Components Of Income From Continuing Operations Before Income Taxes And Income Tax Expense (Benefit)) (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
Income Tax Disclosure [Abstract]
Income (loss) from continuing operations before income taxes	$ 51,200	$ 108,700	$ 89,900	$ (9,800)	$ 66,800	$ 71,800	$ 74,100	$ 139,300	$ 240,022	$ 352,031	$ 218,289
Federal - Current									39,147	74,932	58,039
Federal - Deferred									(50,714)	38,807	15,853
State - Current and deferred									6,325	16,800	6,806
Total									$ (5,242)	$ 130,539	$ 80,698

Income Taxes (Schedule Of Recon

Income Taxes (Schedule Of Reconciliation Of Income Taxes To Statutory Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income tax expense based on the U.S. statutory tax rate	$ 84,008	$ 123,211	$ 76,401
State income taxes, net of federal benefit	2,976	11,438	4,424
Effect of U.S. tax law change	(88,927)	0	0
Other, net	(3,299)	(4,110)	(127)
Total	$ (5,242)	$ 130,539	$ 80,698

Income Taxes (Summary Of Deferr

Income Taxes (Summary Of Deferred Tax Assets And Deferred Tax Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets
Property costs and asset retirement obligations	$ 2,833	$ 4,059
Employee benefits	4,382	10,742
Other deferred tax assets	3,436	7,623
Total gross deferred tax assets	10,651	22,424
Less valuation allowance	0	0
Net deferred tax assets	10,651	22,424
Deferred tax liabilities
Accumulated depreciation and amortization	(142,081)	(197,727)
State deferred taxes	(18,944)	(18,643)
Other deferred tax liabilities	(3,871)	(10,710)
Total gross deferred tax liabilities	(164,896)	(227,080)
Net deferred tax liabilities	$ (154,245)	$ (204,656)

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Contingency [Line Items]
Tax benefit related to Tax Cuts and Jobs Act	$ (88,927)	$ 0	$ 0
Income tax expense, net benefits for interest and penalties	400	$ 1,500	$ 700
Accounting Standards Update 2016-09 [Member]
Income Tax Contingency [Line Items]
Excess tax benefits	$ 2,200

Income Taxes (Reconciliation of

Income Taxes (Reconciliation of Beginning and Ending Liability For Uncertain Tax Positions) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1	$ 7,874	$ 5,450
Additions for tax positions related to prior years	4,406	3,771
Additions for tax positions related to current year	0	0
Settlements with taxing authorities	(5,451)	0
Expiration of statutes of limitation	(2,391)	(1,347)
Balance at December 31	$ 4,438	$ 7,874

Incentive Plans (Narrative) (De

Incentive Plans (Narrative) (Details)	12 Months Ended				52 Months Ended
	Dec. 31, 2017USD ($)plan$ / sharescompanyshares	Dec. 31, 2016USD ($)shares	Dec. 31, 2015USD ($)shares	Dec. 31, 2014$ / shares	Dec. 31, 2017USD ($)plancompanyshares	Feb. 12, 2014shares	Aug. 30, 2013shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share based compensation plans | plan	2				2
Shares granted (in shares)	114,800	96,500	72,350
Unrecognized compensation cost related to stock option awards | $	$ 14,700,000				$ 14,700,000
Unrecognized compensation cost related to stock option awards, weighted average period for recognition (in years)	1 year 297 days
Total income tax benefits realized from tax deductions related to stock option exercises under share-based payment arrangements | $	$ 600,000	$ 1,600,000	$ 3,100,000
Murphy Oil [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum grant date fair value of options replaced (in dollars per share) | $ / shares				$ 32.53
Maximum grant date fair value of options replaced (in dollars per share) | $ / shares				$ 40.25
2013 Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares authorized for incentive plan (in shares)						5,500,000	10,000,000
Maximum number of shares per employee (in shares)	1,000,000
Maximum amount payable | $	$ 5,000,000
Shares granted (in shares)					1,878,065
Shares available for grant (in shares)	3,621,935				3,621,935
2013 Long-Term Incentive Plan [Member] | Murphy Oil [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	2 years
2013 Stock Plan For Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares authorized for incentive plan (in shares)	500,000				500,000
Award vesting period (in years)	3 years
Shares available for grant (in shares)	400,378				400,378
Restricted stock units issued (in shares)					99,622
2013 Stock Plan For Non-Employee Directors [Member] | Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units issued (in shares)	15,948	19,900	12,924
MUSA 2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units issued (in shares)	111,471	74,325	55,450
Option term (in years)	7 years
MUSA 2013 Plan [Member] | Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	3 years
MUSA 2013 Plan [Member] | Return On Average Capital Employed Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	3 years
Restricted stock units issued, weighted average grant date fair value (in dollars per share) | $ / shares	$ 65.75
MUSA 2013 Plan [Member] | Total Shareholder Return Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	3 years
Number of companies in total shareholder return peer comparison group | company	16				16
Restricted stock units issued, weighted average grant date fair value (in dollars per share) | $ / shares	$ 94.51

Incentive Plans (Schedule of Sh

Incentive Plans (Schedule of Share-Based Plan Amounts Recognized) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Compensation charged against income before income tax benefit	$ 7,495	$ 9,314	$ 9,015
Related income tax benefit recognized in income	$ 2,623	$ 3,259	$ 3,155

Incentive Plans (Summary of Val

Incentive Plans (Summary of Valuation Assumptions) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2012	Dec. 31, 2011
Murphy Oil Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility, minimum				37.00%	37.00%
Expected volatility, maximum				39.62%	39.62%
Risk-free interest rate, minimum				0.55%	0.55%
Risk-free interest rate, maximum				2.10%	2.10%
MUSA 2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per option grant (in dollars per share)	$ 15.45	$ 16.08	$ 20.18
Dividend yield	0.00%	0.00%	0.00%
Expected volatility	26.00%	26.10%	29.30%
Risk-free interest rate	1.65%	1.26%	1.52%
Expected life (in years)	4 years 2 months	5 years 8 months	5 years
Minimum [Member] | Murphy Oil Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per option grant (in dollars per share)				$ 12.37	$ 12.37
Dividend yield				1.80%	1.80%
Expected life (in years)				4 years	4 years
Maximum [Member] | Murphy Oil Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per option grant (in dollars per share)				$ 20.34	$ 20.34
Dividend yield				2.27%	2.27%
Expected life (in years)				5 years 2 months 12 days	5 years 2 months 12 days

Incentive Plans (Summary of Cha

Incentive Plans (Summary of Changes in Stock Options Outstanding) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Number of Shares (in shares)
Beginning balance (in shares)	420,937	465,756	660,635
Granted at FMV (in shares)	114,800	96,500	72,350
Exercised (in shares)	(43,887)	(126,969)	(236,620)
Forfeited (in shares)	(25,950)	(14,350)	(30,609)
Ending balance (in shares)	465,900	420,937	465,756
Average Exercise Price (in dollars per share)
Beginning balance (in dollars per share)	$ 47.88	$ 42.22	$ 36
Granted at FMV (in dollars per share)	65.75	59.11	70.57
Exercised (in dollars per share)	37.41	34.48	33.80
Forfeited (in dollars per share)	63.63	58.28	40.21
Ending balance (in dollars per share)	$ 52.39	$ 47.88	$ 42.22
Exercisable (in shares)	254,375	218,937	127,077
Shares exercisable, average exercise price (in dollars per share)	$ 42.80	$ 38.32	$ 36.71

Incentive Plans (Summary of Add

Incentive Plans (Summary of Additional Stock Option Information) (Details)	12 Months Ended
	Dec. 31, 2017USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares) | shares	465,900
Options outstanding, average remaining life (in years)	3 years 10 months 28 days
Options outstanding, aggregate intrinsic value | $	$ 13,031,227
Options exercisable (in shares) | shares	254,375
Options exercisable, average remaining life (in years)	2 years 7 months 10 days
Options exercisable, aggregate intrinsic value | $	$ 9,553,541
$32.53 to $37.06 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lower range limit of exercise price (in dollars per share) | $ / shares	$ 32.53
Upper range limit of exercise price (in dollars per share) | $ / shares	$ 37.06
Options outstanding (in shares) | shares	32,687
Options outstanding, average remaining life (in years)	1 year 9 months 18 days
Options outstanding, aggregate intrinsic value | $	$ 1,518,763
Options exercisable (in shares) | shares	32,687
Options exercisable, average remaining life (in years)	1 year 9 months 18 days
Options exercisable, aggregate intrinsic value | $	$ 1,518,763
$37.07 to $39.45 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lower range limit of exercise price (in dollars per share) | $ / shares	$ 37.07
Upper range limit of exercise price (in dollars per share) | $ / shares	$ 39.45
Options outstanding (in shares) | shares	264
Options outstanding, average remaining life (in years)	1 month 2 days
Options outstanding, aggregate intrinsic value | $	$ 11,428
Options exercisable (in shares) | shares	264
Options exercisable, average remaining life (in years)	1 month 2 days
Options exercisable, aggregate intrinsic value | $	$ 11,428
$39.46 to $40.25 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lower range limit of exercise price (in dollars per share) | $ / shares	$ 39.46
Upper range limit of exercise price (in dollars per share) | $ / shares	$ 40.25
Options outstanding (in shares) | shares	191,249
Options outstanding, average remaining life (in years)	2 years 6 months 14 days
Options outstanding, aggregate intrinsic value | $	$ 7,727,937
Options exercisable (in shares) | shares	191,249
Options exercisable, average remaining life (in years)	2 years 6 months 14 days
Options exercisable, aggregate intrinsic value | $	$ 7,727,937
$40.26 to $70.57 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lower range limit of exercise price (in dollars per share) | $ / shares	$ 40.26
Upper range limit of exercise price (in dollars per share) | $ / shares	$ 70.57
Options outstanding (in shares) | shares	241,700
Options outstanding, average remaining life (in years)	5 years 3 months 11 days
Options outstanding, aggregate intrinsic value | $	$ 3,773,099
Options exercisable (in shares) | shares	30,175
Options exercisable, average remaining life (in years)	3 years 11 months 1 day
Options exercisable, aggregate intrinsic value | $	$ 295,413

Incentive Plans (Summary of Res

Incentive Plans (Summary of Restricted Stock Unit Activity) (Details) - shares	12 Months Ended			52 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017
MUSA 2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning balance (in shares)	269,345	356,300	397,015
Granted (in shares)	111,471	74,325	55,450
Vested and issued (in shares)	(60,688)	(142,392)	(66,116)
Forfeited (in shares)	(61,112)	(18,888)	(30,049)
Ending balance (in shares)	259,016	269,345	356,300	259,016
MUSA 2013 Plan [Member] | Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning balance (in shares)	147,740	102,394	72,000
Granted (in shares)	53,800	53,300	40,400
Vested and issued (in shares)	(60,816)	0	0
Forfeited (in shares)	(16,000)	(7,954)	(10,006)
Ending balance (in shares)	124,724	147,740	102,394	124,724
2013 Stock Plan For Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted (in shares)				99,622
2013 Stock Plan For Non-Employee Directors [Member] | Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning balance (in shares)	49,342	63,774	50,850
Granted (in shares)	15,948	19,900	12,924
Vested and issued (in shares)	(19,944)	(34,332)	0
Forfeited (in shares)	0	0	0
Ending balance (in shares)	45,346	49,342	63,774	45,346

Employee and Retiree Benefit 67

Employee and Retiree Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Profit Sharing Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Profit sharing contributions	$ 2.2	$ 1.8	$ 1.8
Thrift Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Company matching contribution (percent)	100.00%
Employee's maximum contribution matched by Company (percent)	6.00%
Profit sharing percentage 1	5.00%
Profit sharing percentage 2	7.00%
Profit sharing percentage 3	9.00%
Profit sharing contributions	$ 12.1	$ 10.5	$ 9.2

Financial Instruments and Ris68

Financial Instruments and Risk Management (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Cash deposits related to commodity derivative contracts	$ 2.7	$ 1.8

Earnings Per Share (Narrative)

Earnings Per Share (Narrative) (Details)	Aug. 30, 2013shares	May 31, 2014USD ($)$ / shares	Dec. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2014shares	Dec. 31, 2017$ / sharesshares	Dec. 31, 2016$ / sharesshares	Dec. 31, 2015$ / sharesshares	Jan. 25, 2016USD ($)capital_program	Oct. 31, 2014USD ($)
Equity, Class of Treasury Stock [Line Items]
Issuance of stock at the separation and distribution (in shares) | shares	46,743,316
May 2014 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, approved amount | $		$ 50,000,000
Stock repurchase program, shares acquired (in shares) | shares				1,040,636
Stock repurchase program, average price per share (in dollars per share) | $ / shares		$ 48.07
Two Hundred Fifty Million Dollar Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, approved amount | $									$ 250,000,000
Stock repurchase program, shares acquired (in shares) | shares							4,196,349
Stock repurchase program, average price per share (in dollars per share) | $ / shares							$ 59.58
January 2016 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, shares acquired (in shares) | shares			379,054		2,586,190	4,903,198
Stock repurchase program, average price per share (in dollars per share) | $ / shares			$ 0		$ 68.34	$ 65.93
Stock repurchase program, authorized amount | $								$ 500,000,000
Stock repurchase program, number of capital programs | capital_program								2
Stock repurchase program, shares acquired | $			$ 29,000,000

Earnings Per Share (Reconciliat

Earnings Per Share (Reconciliation of Basic and Diluted Earnings Per Share Computations) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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]
Income (loss) from continuing operations	$ 124,900	$ 67,900	$ 55,500	$ (3,000)	$ 43,800	$ 45,500	$ 46,300	$ 85,900	$ 245,264	$ 221,492	$ 137,591
Income from discontinued operations, net of income taxes									0	0	38,749
Net Income	$ 124,900	$ 67,900	$ 55,500	$ (3,000)	$ 43,800	$ 45,500	$ 46,300	$ 85,900	$ 245,264	$ 221,492	$ 176,340
Earnings per share - basic:
Continuing operations (in dollars per share)	$ 3.62	$ 1.92	$ 1.52	$ (0.08)	$ 1.16	$ 1.17	$ 1.18	$ 2.10	$ 6.85	$ 5.64	$ 3.17
Discontinued operations (in dollars per share)									0	0	0.89
Net income - basic (in dollars per share)	3.62	1.92	1.52	(0.08)	1.16	1.17	1.18	2.10	$ 6.85	$ 5.64	$ 4.06
Weighted-average shares outstanding (in thousands):
Weighted average common shares outstanding (in thousands) (in shares)									35,816	39,269	43,434
Share-based awards (in shares)									340	377	360
Weighted average common shares outstanding - assuming dilution (in thousands) (in shares)									36,156	39,646	43,794
Earnings per share - diluted:
Continuing operations (in dollars per share)	3.58	1.90	1.51	(0.08)	1.14	1.16	1.17	2.08	$ 6.78	$ 5.59	$ 3.14
Discontinued operations (in dollars per share)									0	0	0.88
Net income - diluted (in dollars per share)	$ 3.58	$ 1.90	$ 1.51	$ (0.08)	$ 1.14	$ 1.16	$ 1.17	$ 2.08	$ 6.78	$ 5.59	$ 4.02

Other Financial Information (Sc

Other Financial Information (Schedule Of Renewable Identification Numbers (RINs) and Other Revenue) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Renewable Identification Numbers (RINs) sales	$ 160,279	$ 181,138	$ 117,513
Other	5,760	4,206	3,321
Total other operating revenue	$ 166,039	$ 185,344	$ 120,834

Other Financial Information (Na

Other Financial Information (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Income taxes paid (collected), net	$ 51.7	$ 70.8	$ 113.5
Interest paid, net of amounts capitalized	$ 41.5	$ 37.1	$ 31.8

Other Financial Information (Su

Other Financial Information (Summary Of Changes In Operating Working Capital) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts receivable	$ (41,673)	$ (47,203)	$ 2,857
Inventories	(16,344)	2,143	1,121
Prepaid expenses and other current assets	(5,184)	13,705	(27,107)
Accounts payable and accrued liabilities	26,841	83,384	1,043
Income taxes payable	(594)	1,697	(25,599)
Current deferred income tax liabilities	0	0	1,099
Net decrease (increase) in noncash operating working capital	$ (36,954)	$ 53,726	$ (46,586)

Assets and Liabilities Measur74

Assets and Liabilities Measure at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Carrying Amount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current and long-term debt	$ (880,751)	$ (670,218)
Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current and long-term debt	$ (904,931)	$ (690,114)

Commitments (Details)

Commitments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Expected future rental payments under operating leases in 2018	$ 12.3
Expected future rental payments under operating leases in 2019	11.9
Expected future rental payments under operating leases in 2020	11.7
Expected future rental payments under operating leases in 2021	11.5
Expected future rental payments under operating leases in 2022	11
Rental expense for noncancelable operating leases	$ 14	$ 23.2	$ 22.4
Operating lease expense related to discontinued operations			$ 2.7
Take-Or-Pay Contracts [Member]
Other Commitments [Line Items]
Term of take-or-pay contract	1 year
Take-or-pay contract due in 2018	$ 9.5
Capital Addition Purchase Commitments [Member]
Other Commitments [Line Items]
Commitments for capital expenditures	180.8
Construction in Progress [Member]
Other Commitments [Line Items]
Commitments for capital expenditures	158.8
Building Improvements [Member]
Other Commitments [Line Items]
Commitments for capital expenditures	$ 9.8

Contingencies (Details)

Contingencies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)site
Commitments and Contingencies Disclosure [Abstract]
Number of Superfund sites for which company may be liable | site	1
Liability accrued	$ 0.1
Workers' compensation deductible (per occurrence)	1
General liability insurance deductible	3
Auto liability insurance deductible	0.3
Workers' compensation accrued liability	19.5
Outstanding letters of credit	$ 15.4

Recent Accounting and Reporti77

Recent Accounting and Reporting Rules Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Excess tax benefits	$ 2.2

Business Segments (Summary of I

Business Segments (Summary of Information by Business 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 ($)segment	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment									1
Segment Reporting Information [Line Items]
Segment income (loss)	$ 124,900	$ 67,900	$ 55,500	$ (3,000)	$ 43,800	$ 45,500	$ 46,300	$ 85,900	$ 245,264	$ 221,492	$ 176,340
Revenues from external customers	3,379,500	$ 3,236,300	$ 3,211,100	$ 2,999,600	3,055,800	$ 3,042,700	$ 3,005,800	$ 2,490,300	12,826,553	11,594,553	12,699,411
Interest income									1,309	578	2,177
Interest expense									(46,660)	(39,704)	(33,531)
Income tax expense (benefit)									(5,242)	130,539	80,698
Depreciation and amortization									116,966	98,610	86,568
Accretion of asset retirement obligations									1,785	1,650	1,521
Deferred and noncurrent income taxes (benefits)									50,411	(40,407)	(40,556)
Additions to property, plant and equipment									273,722	263,856	215,568
Total assets at year-end	2,331,039				2,088,740				2,331,039	2,088,740	1,886,241
Segment Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Segment income (loss)									0	0	38,749
Revenues from external customers									0	0	0
Interest income									0	0	0
Interest expense									0	0	0
Income tax expense (benefit)									0	0	0
Depreciation and amortization									0	0	0
Accretion of asset retirement obligations									0	0	0
Deferred and noncurrent income taxes (benefits)									0	0	0
Additions to property, plant and equipment									0	0	3,720
Total assets at year-end	0				0				0	0	0
Operating Segments [Member] | Marketing Segment [Member] | Segment Continuing Operations [Member]
Segment Reporting Information [Line Items]
Segment income (loss)									295,322	249,790	159,796
Revenues from external customers									12,826,228	11,594,311	12,699,124
Interest income									0	0	0
Interest expense									(83)	(53)	(20)
Income tax expense (benefit)									(2,923)	147,217	95,657
Depreciation and amortization									110,530	92,242	81,349
Accretion of asset retirement obligations									1,785	1,650	1,521
Deferred and noncurrent income taxes (benefits)									61,299	(51,290)	(42,593)
Additions to property, plant and equipment									234,029	239,095	202,371
Total assets at year-end	2,023,376				1,858,055				2,023,376	1,858,055	1,727,131
Corporate, Non-Segment [Member] | Segment Continuing Operations [Member]
Segment Reporting Information [Line Items]
Segment income (loss)									(50,058)	(28,298)	(22,205)
Revenues from external customers									325	242	287
Interest income									1,309	578	2,177
Interest expense									(46,577)	(39,651)	(33,511)
Income tax expense (benefit)									(2,319)	(16,678)	(14,959)
Depreciation and amortization									6,436	6,368	5,219
Accretion of asset retirement obligations									0	0	0
Deferred and noncurrent income taxes (benefits)									(10,888)	10,883	2,037
Additions to property, plant and equipment									39,693	24,761	9,477
Total assets at year-end	$ 307,663				$ 230,685				$ 307,663	$ 230,685	$ 159,110

Guarantor Subsidiaries (Narrati

Guarantor Subsidiaries (Narrative) (Details) - Senior Notes [Member]	Dec. 31, 2017	Apr. 25, 2017	Dec. 31, 2016	Aug. 14, 2013
6.00% senior notes due 2023 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	6.00%		6.00%	6.00%
5.625% senior notes due 2027 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	5.625%	5.625%	0.00%

Guarantor Subsidiaries (Consoli

Guarantor Subsidiaries (Consolidating Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 170,028	$ 153,813	$ 102,335
Accounts receivable—trade, less allowance for doubtful accounts of $1,094 in 2017 and $1,891 in 2016	225,268	183,519
Inventories, at lower of cost or market	182,477	153,351
Prepaid expenses and other current assets	36,521	24,871
Total current assets	614,294	515,554
Property, plant and equipment, at cost less accumulated depreciation and amortization of $874,675 in 2017 and $780,426 in 2016	1,679,470	1,532,655
Investments in subsidiaries	0	0
Other assets	37,275	40,531
Total assets	2,331,039	2,088,740	1,886,241
Current liabilities
Current maturities of long-term debt	19,887	40,596
Inter-company accounts payable	0	0
Trade accounts payable and accrued liabilities	513,464	473,370
Income taxes payable	0	594
Total current liabilities	533,351	514,560
Long-term debt, including capitalized lease obligations	860,864	629,622
Deferred income taxes	154,245	204,656
Asset retirement obligations	28,159	26,200
Deferred credits and other liabilities	16,018	16,626
Total liabilities	1,592,637	1,391,664
Stockholders' Equity
Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding)	0	0
Common Stock, par $0.01, (authorized 200,000,000 shares, 46,767,164 and 46,767,164 shares issued at 2017 and 2016, respectively)	468	468
Treasury stock (12,675,630 and 9,831,196 shares held at December 31, 2017 and December 31, 2016, respectively)	(806,511)	(608,001)
Additional paid in capital (APIC)	549,910	555,338
Retained earnings	994,535	749,271
Total stockholders' equity	738,402	697,076	792,290	$ 858,705
Total liabilities and stockholders' equity	2,331,039	2,088,740
Eliminations [Member]
Current assets
Cash and cash equivalents	0	0	0
Accounts receivable—trade, less allowance for doubtful accounts of $1,094 in 2017 and $1,891 in 2016	0	0
Inventories, at lower of cost or market	0	0
Prepaid expenses and other current assets	0	0
Total current assets	0	0
Property, plant and equipment, at cost less accumulated depreciation and amortization of $874,675 in 2017 and $780,426 in 2016	0	0
Investments in subsidiaries	(2,368,272)	(2,123,027)
Other assets	0	0
Total assets	(2,368,272)	(2,123,027)
Current liabilities
Current maturities of long-term debt	0	0
Inter-company accounts payable	0	0
Trade accounts payable and accrued liabilities	0	0
Income taxes payable	0	0
Total current liabilities	0	0
Long-term debt, including capitalized lease obligations	0	0
Deferred income taxes	0	0
Asset retirement obligations	0	0
Deferred credits and other liabilities	0	0
Total liabilities	0	0
Stockholders' Equity
Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding)	0	0
Common Stock, par $0.01, (authorized 200,000,000 shares, 46,767,164 and 46,767,164 shares issued at 2017 and 2016, respectively)	(61)	(61)
Treasury stock (12,675,630 and 9,831,196 shares held at December 31, 2017 and December 31, 2016, respectively)	0	0
Additional paid in capital (APIC)	(1,368,382)	(1,368,382)
Retained earnings	(999,829)	(754,584)
Total stockholders' equity	(2,368,272)	(2,123,027)
Total liabilities and stockholders' equity	(2,368,272)	(2,123,027)
Parent Company [Member] | Reportable Legal Entities [Member]
Current assets
Cash and cash equivalents	0	0	0
Accounts receivable—trade, less allowance for doubtful accounts of $1,094 in 2017 and $1,891 in 2016	0	0
Inventories, at lower of cost or market	0	0
Prepaid expenses and other current assets	0	0
Total current assets	0	0
Property, plant and equipment, at cost less accumulated depreciation and amortization of $874,675 in 2017 and $780,426 in 2016	0	0
Investments in subsidiaries	2,223,374	1,978,110
Other assets	0	0
Total assets	2,223,374	1,978,110
Current liabilities
Current maturities of long-term debt	0	0
Inter-company accounts payable	829,202	623,316
Trade accounts payable and accrued liabilities	0	0
Income taxes payable	0	0
Total current liabilities	829,202	623,316
Long-term debt, including capitalized lease obligations	0	0
Deferred income taxes	0	0
Asset retirement obligations	0	0
Deferred credits and other liabilities	0	0
Total liabilities	829,202	623,316
Stockholders' Equity
Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding)	0	0
Common Stock, par $0.01, (authorized 200,000,000 shares, 46,767,164 and 46,767,164 shares issued at 2017 and 2016, respectively)	468	468
Treasury stock (12,675,630 and 9,831,196 shares held at December 31, 2017 and December 31, 2016, respectively)	(806,511)	(608,001)
Additional paid in capital (APIC)	1,205,680	1,213,056
Retained earnings	994,535	749,271
Total stockholders' equity	1,394,172	1,354,794
Total liabilities and stockholders' equity	2,223,374	1,978,110
Issuer [Member] | Reportable Legal Entities [Member]
Current assets
Cash and cash equivalents	169,978	153,813	102,335
Accounts receivable—trade, less allowance for doubtful accounts of $1,094 in 2017 and $1,891 in 2016	225,268	183,519
Inventories, at lower of cost or market	182,477	153,351
Prepaid expenses and other current assets	36,507	24,871
Total current assets	614,230	515,554
Property, plant and equipment, at cost less accumulated depreciation and amortization of $874,675 in 2017 and $780,426 in 2016	1,678,298	1,532,655
Investments in subsidiaries	144,898	144,917
Other assets	37,275	40,531
Total assets	2,474,701	2,233,657
Current liabilities
Current maturities of long-term debt	19,887	40,596
Inter-company accounts payable	(624,065)	(416,914)
Trade accounts payable and accrued liabilities	513,471	473,370
Income taxes payable	0	591
Total current liabilities	(90,707)	97,643
Long-term debt, including capitalized lease obligations	860,864	629,622
Deferred income taxes	154,245	204,656
Asset retirement obligations	28,159	26,200
Deferred credits and other liabilities	16,018	16,626
Total liabilities	968,579	974,747
Stockholders' Equity
Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding)	0	0
Common Stock, par $0.01, (authorized 200,000,000 shares, 46,767,164 and 46,767,164 shares issued at 2017 and 2016, respectively)	1	1
Treasury stock (12,675,630 and 9,831,196 shares held at December 31, 2017 and December 31, 2016, respectively)	0	0
Additional paid in capital (APIC)	573,065	571,117
Retained earnings	933,056	687,792
Total stockholders' equity	1,506,122	1,258,910
Total liabilities and stockholders' equity	2,474,701	2,233,657
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Current assets
Cash and cash equivalents	50	0	0
Accounts receivable—trade, less allowance for doubtful accounts of $1,094 in 2017 and $1,891 in 2016	0	0
Inventories, at lower of cost or market	0	0
Prepaid expenses and other current assets	14	0
Total current assets	64	0
Property, plant and equipment, at cost less accumulated depreciation and amortization of $874,675 in 2017 and $780,426 in 2016	1,172	0
Investments in subsidiaries	0	0
Other assets	0	0
Total assets	1,236	0
Current liabilities
Current maturities of long-term debt	0	0
Inter-company accounts payable	(50,799)	(52,064)
Trade accounts payable and accrued liabilities	(7)	0
Income taxes payable	0	3
Total current liabilities	(50,806)	(52,061)
Long-term debt, including capitalized lease obligations	0	0
Deferred income taxes	0	0
Asset retirement obligations	0	0
Deferred credits and other liabilities	0	0
Total liabilities	(50,806)	(52,061)
Stockholders' Equity
Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding)	0	0
Common Stock, par $0.01, (authorized 200,000,000 shares, 46,767,164 and 46,767,164 shares issued at 2017 and 2016, respectively)	60	60
Treasury stock (12,675,630 and 9,831,196 shares held at December 31, 2017 and December 31, 2016, respectively)	0	0
Additional paid in capital (APIC)	52,004	52,004
Retained earnings	(22)	(3)
Total stockholders' equity	52,042	52,061
Total liabilities and stockholders' equity	1,236	0
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Current assets
Cash and cash equivalents	0	0	$ 0
Accounts receivable—trade, less allowance for doubtful accounts of $1,094 in 2017 and $1,891 in 2016	0	0
Inventories, at lower of cost or market	0	0
Prepaid expenses and other current assets	0	0
Total current assets	0	0
Property, plant and equipment, at cost less accumulated depreciation and amortization of $874,675 in 2017 and $780,426 in 2016	0	0
Investments in subsidiaries	0	0
Other assets	0	0
Total assets	0	0
Current liabilities
Current maturities of long-term debt	0	0
Inter-company accounts payable	(154,338)	(154,338)
Trade accounts payable and accrued liabilities	0	0
Income taxes payable	0	0
Total current liabilities	(154,338)	(154,338)
Long-term debt, including capitalized lease obligations	0	0
Deferred income taxes	0	0
Asset retirement obligations	0	0
Deferred credits and other liabilities	0	0
Total liabilities	(154,338)	(154,338)
Stockholders' Equity
Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding)	0	0
Common Stock, par $0.01, (authorized 200,000,000 shares, 46,767,164 and 46,767,164 shares issued at 2017 and 2016, respectively)	0	0
Treasury stock (12,675,630 and 9,831,196 shares held at December 31, 2017 and December 31, 2016, respectively)	0	0
Additional paid in capital (APIC)	87,543	87,543
Retained earnings	66,795	66,795
Total stockholders' equity	154,338	154,338
Total liabilities and stockholders' equity	$ 0	$ 0

Guarantor Subsidiaries (Conso81

Guarantor Subsidiaries (Consolidating Balance Sheet Parenthetical) (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Guarantor Subsidiaries [Abstract]
Accounts receivable - trade, allowance for doubtful accounts	$ 1,094	$ 1,891
Accumulated depreciation and amortization	$ 874,675	$ 780,426
Preferred stock par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock shares authorized (in shares)	20,000,000	20,000,000
Preferred stock shares outstanding (in shares)	0	0
Common stock par value (in dollars per share)	$ 0.01	$ 0.01
Common stock shares authorized (in shares)	200,000,000	200,000,000
Common stock shares issued (in shares)	46,767,164	46,767,164
Treasury stock (in shares)	12,675,630	9,831,196

Guarantor Subsidiaries (Conso82

Guarantor Subsidiaries (Consolidating Income Statement) (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
Operating Revenues
Petroleum product sales	[1]									$ 10,287,856	$ 9,070,623	$ 10,304,689
Merchandise sales										2,372,658	2,338,586	2,273,888
Other operating revenues										166,039	185,344	120,834
Total operating revenues		$ 3,379,500	$ 3,236,300	$ 3,211,100	$ 2,999,600	$ 3,055,800	$ 3,042,700	$ 3,005,800	$ 2,490,300	12,826,553	11,594,553	12,699,411
Operating Expenses
Petroleum product cost of goods sold	[1]									9,773,211	8,603,953	9,794,475
Merchandise cost of goods sold										1,991,404	1,974,486	1,946,423
Station and other operating expenses										514,873	493,320	486,383
Depreciation and amortization										116,966	98,610	86,568
Selling, general and administrative										141,171	122,669	129,277
Accretion expense										1,785	1,650	1,521
Total operating expenses										12,539,410	11,294,688	12,444,647
Gain (loss) on sale of assets										(3,950)	88,212	(4,658)
Income from operations										283,193	388,077	250,106
Other income (expense)
Interest income										1,309	578	2,177
Interest expense										(46,660)	(39,704)	(33,531)
Other nonoperating income (expense)										2,180	3,080	(463)
Total other income (expense)										(43,171)	(36,046)	(31,817)
Income from continuing operations before income taxes		51,200	108,700	89,900	(9,800)	66,800	71,800	74,100	139,300	240,022	352,031	218,289
Income tax expense (benefit)										(5,242)	130,539	80,698
Income from continuing operations		124,900	67,900	55,500	(3,000)	43,800	45,500	46,300	85,900	245,264	221,492	137,591
Income from discontinued operations, net of income taxes										0	0	38,749
Equity earnings in affiliates, net of tax										0	0	0
Net Income		$ 124,900	$ 67,900	$ 55,500	$ (3,000)	$ 43,800	$ 45,500	$ 46,300	$ 85,900	245,264	221,492	176,340
Eliminations [Member]
Operating Revenues
Petroleum product sales										0	0	(120,166)
Merchandise sales										0	0	0
Other operating revenues										0	0	0
Total operating revenues										0	0	(120,166)
Operating Expenses
Petroleum product cost of goods sold										0	0	(120,166)
Merchandise cost of goods sold										0	0	0
Station and other operating expenses										0	0	0
Depreciation and amortization										0	0	0
Selling, general and administrative										0	0	0
Accretion expense										0	0	0
Total operating expenses										0	0	(120,166)
Gain (loss) on sale of assets										0	0	0
Income from operations										0	0	0
Other income (expense)
Interest income										0	0	0
Interest expense										0	0	0
Other nonoperating income (expense)										0	0	0
Total other income (expense)										0	0	0
Income from continuing operations before income taxes										0	0	0
Income tax expense (benefit)										0	0	0
Income from continuing operations										0	0	0
Income from discontinued operations, net of income taxes										0	0	0
Equity earnings in affiliates, net of tax										(245,245)	(221,491)	(92,130)
Net Income										(245,245)	(221,491)	(92,130)
Parent Company [Member] | Reportable Legal Entities [Member]
Operating Revenues
Petroleum product sales										0	0	0
Merchandise sales										0	0	0
Other operating revenues										0	0	0
Total operating revenues										0	0	0
Operating Expenses
Petroleum product cost of goods sold										0	0	0
Merchandise cost of goods sold										0	0	0
Station and other operating expenses										0	0	0
Depreciation and amortization										0	0	0
Selling, general and administrative										0	0	0
Accretion expense										0	0	0
Total operating expenses										0	0	0
Gain (loss) on sale of assets										0	0	0
Income from operations										0	0	0
Other income (expense)
Interest income										0	0	0
Interest expense										0	0	0
Other nonoperating income (expense)										0	0	0
Total other income (expense)										0	0	0
Income from continuing operations before income taxes										0	0	0
Income tax expense (benefit)										0	0	0
Income from continuing operations										0	0	0
Income from discontinued operations, net of income taxes										0	0	0
Equity earnings in affiliates, net of tax										245,264	221,492	176,340
Net Income										245,264	221,492	176,340
Issuer [Member] | Reportable Legal Entities [Member]
Operating Revenues
Petroleum product sales										10,287,856	9,070,623	10,424,855
Merchandise sales										2,372,658	2,338,586	2,273,888
Other operating revenues										166,037	185,344	120,834
Total operating revenues										12,826,551	11,594,553	12,819,577
Operating Expenses
Petroleum product cost of goods sold										9,773,211	8,603,953	9,914,641
Merchandise cost of goods sold										1,991,404	1,974,486	1,946,423
Station and other operating expenses										514,866	493,320	486,383
Depreciation and amortization										116,942	98,610	86,568
Selling, general and administrative										141,170	122,668	129,276
Accretion expense										1,785	1,650	1,521
Total operating expenses										12,539,378	11,294,687	12,564,812
Gain (loss) on sale of assets										(3,950)	88,212	(4,658)
Income from operations										283,223	388,078	250,107
Other income (expense)
Interest income										1,309	578	2,177
Interest expense										(46,660)	(39,704)	(33,531)
Other nonoperating income (expense)										2,180	3,080	(463)
Total other income (expense)										(43,171)	(36,046)	(31,817)
Income from continuing operations before income taxes										240,052	352,032	218,290
Income tax expense (benefit)										(5,231)	130,539	80,698
Income from continuing operations										245,283	221,493	137,592
Income from discontinued operations, net of income taxes										0	0	0
Equity earnings in affiliates, net of tax										(19)	(1)	(22,731)
Net Income										245,264	221,492	114,861
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Operating Revenues
Petroleum product sales										0	0	0
Merchandise sales										0	0	0
Other operating revenues										2	0	0
Total operating revenues										2	0	0
Operating Expenses
Petroleum product cost of goods sold										0	0	0
Merchandise cost of goods sold										0	0	0
Station and other operating expenses										7	0	0
Depreciation and amortization										24	0	0
Selling, general and administrative										1	1	1
Accretion expense										0	0	0
Total operating expenses										32	1	1
Gain (loss) on sale of assets										0	0	0
Income from operations										(30)	(1)	(1)
Other income (expense)
Interest income										0	0	0
Interest expense										0	0	0
Other nonoperating income (expense)										0	0	0
Total other income (expense)										0	0	0
Income from continuing operations before income taxes										(30)	(1)	(1)
Income tax expense (benefit)										(11)	0	0
Income from continuing operations										(19)	(1)	(1)
Income from discontinued operations, net of income taxes										0	0	0
Equity earnings in affiliates, net of tax										0	0	0
Net Income										(19)	(1)	(1)
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Operating Revenues
Petroleum product sales										0	0	0
Merchandise sales										0	0	0
Other operating revenues										0	0	0
Total operating revenues										0	0	0
Operating Expenses
Petroleum product cost of goods sold										0	0	0
Merchandise cost of goods sold										0	0	0
Station and other operating expenses										0	0	0
Depreciation and amortization										0	0	0
Selling, general and administrative										0	0	0
Accretion expense										0	0	0
Total operating expenses										0	0	0
Gain (loss) on sale of assets										0	0	0
Income from operations										0	0	0
Other income (expense)
Interest income										0	0	0
Interest expense										0	0	0
Other nonoperating income (expense)										0	0	0
Total other income (expense)										0	0	0
Income from continuing operations before income taxes										0	0	0
Income tax expense (benefit)										0	0	0
Income from continuing operations										0	0	0
Income from discontinued operations, net of income taxes										0	0	38,749
Equity earnings in affiliates, net of tax										0	0	(61,479)
Net Income										$ 0	$ 0	$ (22,730)
[1]	Years Ended December 31,(Thousands of dollars except per share amounts)2017 2016 2015 Supplemental information: (a) Includes excise taxes of:$1,973,112 $1,961,478 $1,968,629

Guarantor Subsidiaries (Conso83

Guarantor Subsidiaries (Consolidating Statement Of Cash Flow) (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
Operating Activities
Net income	$ 124,900	$ 67,900	$ 55,500	$ (3,000)	$ 43,800	$ 45,500	$ 46,300	$ 85,900	$ 245,264	$ 221,492	$ 176,340
Adjustments to reconcile net income to net cash provided by operating activities
(Income) loss from discontinued operations, net of taxes									0	0	(38,749)
Depreciation and amortization									116,966	98,610	86,568
Deferred and noncurrent income tax charges (benefits)									(50,411)	40,407	40,556
Accretion of asset retirement obligations									1,785	1,650	1,521
Pretax (gains) losses from sale of assets									3,950	(88,212)	4,658
Net decrease (increase) in noncash operating working capital									(36,954)	53,726	(46,586)
Equity in earnings									0	0	0
Other operating activities - net									3,025	9,767	9,417
Net cash provided by (used in) continuing operations									283,625	337,440	233,725
Net cash provided by (used in) discontinued operations									0	0	(17,887)
Net cash provided by operating activities									283,625	337,440	215,838
Investing Activities
Property additions									(258,257)	(262,144)	(205,225)
Proceeds from sale of assets									887	85,327	729
Changes in restricted cash									0	68,571	(68,571)
Other investing activities - net									(4,737)	(28,963)	(2,889)
Sales proceeds									0	0	93,765
Other									0	2,355	(7,443)
Net cash required by investing activities									(262,107)	(134,854)	(189,634)
Financing Activities
Purchase of treasury stock									(205,992)	(323,272)	(248,695)
Repayments of long-term debt									(131,412)	(20,438)	(146)
Additions to long-term debt									338,750	200,000	0
Debt issuance costs									(1,100)	(3,240)	(58)
Amounts related to share-based compensation									(5,549)	(4,158)	(3,075)
Net distributions to parent									0	0	0
Net cash required by financing activities									(5,303)	(151,108)	(251,974)
Net change in cash and cash equivalents									16,215	51,478	(225,770)
Cash and cash equivalents at January 1				153,813				102,335	153,813	102,335	328,105
Cash and cash equivalents at December 31	170,028				153,813				170,028	153,813	102,335
Less: Cash and cash equivalents held for sale	0				0				0	0	0
Cash and cash equivalents	170,028				153,813				170,028	153,813	102,335
Eliminations [Member]
Operating Activities
Net income									(245,245)	(221,491)	(92,130)
Adjustments to reconcile net income to net cash provided by operating activities
(Income) loss from discontinued operations, net of taxes									0	0	0
Depreciation and amortization									0	0	0
Deferred and noncurrent income tax charges (benefits)									0	0	0
Accretion of asset retirement obligations									0	0	0
Pretax (gains) losses from sale of assets									0	0	0
Net decrease (increase) in noncash operating working capital									0	0	0
Equity in earnings									245,245	221,491	92,130
Other operating activities - net									0	0	0
Net cash provided by (used in) continuing operations										0	0
Net cash provided by (used in) discontinued operations										0	0
Net cash provided by operating activities									0	0	0
Investing Activities
Property additions									0	0	0
Proceeds from sale of assets									0	0	0
Changes in restricted cash									0	0	0
Other investing activities - net									0	0	0
Sales proceeds									0	0	0
Other									0	0	0
Net cash required by investing activities									0	0	0
Financing Activities
Purchase of treasury stock									0	0	0
Repayments of long-term debt									0	0	0
Additions to long-term debt									0	0	0
Debt issuance costs									0	0	0
Amounts related to share-based compensation									0	0	0
Net distributions to parent									0	0	0
Net cash required by financing activities									0	0	0
Net change in cash and cash equivalents									0	0	0
Cash and cash equivalents at January 1				0				0	0	0	0
Cash and cash equivalents at December 31	0				0				0	0	0
Less: Cash and cash equivalents held for sale	0				0				0	0	0
Cash and cash equivalents	0				0				0	0	0
Parent Company [Member] | Reportable Legal Entities [Member]
Operating Activities
Net income									245,264	221,492	176,340
Adjustments to reconcile net income to net cash provided by operating activities
(Income) loss from discontinued operations, net of taxes									0	0	0
Depreciation and amortization									0	0	0
Deferred and noncurrent income tax charges (benefits)									0	0	0
Accretion of asset retirement obligations									0	0	0
Pretax (gains) losses from sale of assets									0	0	0
Net decrease (increase) in noncash operating working capital									0	0	0
Equity in earnings									(245,264)	(221,492)	(176,340)
Other operating activities - net									0	0	0
Net cash provided by (used in) continuing operations										0	0
Net cash provided by (used in) discontinued operations										0	0
Net cash provided by operating activities									0	0	0
Investing Activities
Property additions									0	0	0
Proceeds from sale of assets									0	0	0
Changes in restricted cash									0	0	0
Other investing activities - net									0	0	0
Sales proceeds									0	0	0
Other									0	0	0
Net cash required by investing activities									0	0	0
Financing Activities
Purchase of treasury stock									(205,992)	(323,272)	(248,695)
Repayments of long-term debt									0	0	0
Additions to long-term debt									0	0	0
Debt issuance costs									0	0	0
Amounts related to share-based compensation									0	0	0
Net distributions to parent									205,992	323,272	248,695
Net cash required by financing activities									0	0	0
Net change in cash and cash equivalents									0	0	0
Cash and cash equivalents at January 1				0				0	0	0	0
Cash and cash equivalents at December 31	0				0				0	0	0
Less: Cash and cash equivalents held for sale	0				0				0	0	0
Cash and cash equivalents	0				0				0	0	0
Issuer [Member] | Reportable Legal Entities [Member]
Operating Activities
Net income									245,264	221,492	114,861
Adjustments to reconcile net income to net cash provided by operating activities
(Income) loss from discontinued operations, net of taxes									0	0	0
Depreciation and amortization									116,942	98,610	86,568
Deferred and noncurrent income tax charges (benefits)									(50,411)	40,407	40,556
Accretion of asset retirement obligations									1,785	1,650	1,521
Pretax (gains) losses from sale of assets									3,950	(88,212)	4,658
Net decrease (increase) in noncash operating working capital									(36,933)	53,726	(46,586)
Equity in earnings									19	1	22,731
Other operating activities - net									3,025	9,767	9,417
Net cash provided by (used in) continuing operations										337,441	233,726
Net cash provided by (used in) discontinued operations										0	0
Net cash provided by operating activities									283,641	337,441	233,726
Investing Activities
Property additions									(257,062)	(262,144)	(205,225)
Proceeds from sale of assets									887	85,327	729
Changes in restricted cash									0	68,571	(68,571)
Other investing activities - net									(4,737)	(28,963)	(2,889)
Sales proceeds									0	0	0
Other									0	2,355	0
Net cash required by investing activities									(260,912)	(134,854)	(275,956)
Financing Activities
Purchase of treasury stock									0	0	0
Repayments of long-term debt									(131,412)	(20,438)	(146)
Additions to long-term debt									338,750	200,000	0
Debt issuance costs									(1,100)	(3,240)	(58)
Amounts related to share-based compensation									(5,549)	(4,158)	(3,075)
Net distributions to parent									(207,253)	(323,273)	(179,319)
Net cash required by financing activities									(6,564)	(151,109)	(182,598)
Net change in cash and cash equivalents									16,165	51,478	(224,828)
Cash and cash equivalents at January 1				153,813				102,335	153,813	102,335	327,163
Cash and cash equivalents at December 31	169,978				153,813				169,978	153,813	102,335
Less: Cash and cash equivalents held for sale	0				0				0	0	0
Cash and cash equivalents	169,978				153,813				169,978	153,813	102,335
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Operating Activities
Net income									(19)	(1)	(1)
Adjustments to reconcile net income to net cash provided by operating activities
(Income) loss from discontinued operations, net of taxes									0	0	0
Depreciation and amortization									24	0	0
Deferred and noncurrent income tax charges (benefits)									0	0	0
Accretion of asset retirement obligations									0	0	0
Pretax (gains) losses from sale of assets									0	0	0
Net decrease (increase) in noncash operating working capital									(21)	0	0
Equity in earnings									0	0	0
Other operating activities - net									0	0	0
Net cash provided by (used in) continuing operations										(1)	(1)
Net cash provided by (used in) discontinued operations										0	0
Net cash provided by operating activities									(16)	(1)	(1)
Investing Activities
Property additions									(1,195)	0	0
Proceeds from sale of assets									0	0	0
Changes in restricted cash									0	0	0
Other investing activities - net									0	0	0
Sales proceeds									0	0	0
Other									0	0	0
Net cash required by investing activities									(1,195)	0	0
Financing Activities
Purchase of treasury stock									0	0	0
Repayments of long-term debt									0	0	0
Additions to long-term debt									0	0	0
Debt issuance costs									0	0	0
Amounts related to share-based compensation									0	0	0
Net distributions to parent									1,261	1	1
Net cash required by financing activities									1,261	1	1
Net change in cash and cash equivalents									50	0	0
Cash and cash equivalents at January 1				0				0	0	0	0
Cash and cash equivalents at December 31	50				0				50	0	0
Less: Cash and cash equivalents held for sale	0				0				0	0	0
Cash and cash equivalents	50				0				50	0	0
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Operating Activities
Net income									0	0	(22,730)
Adjustments to reconcile net income to net cash provided by operating activities
(Income) loss from discontinued operations, net of taxes									0	0	(38,749)
Depreciation and amortization									0	0	0
Deferred and noncurrent income tax charges (benefits)									0	0	0
Accretion of asset retirement obligations									0	0	0
Pretax (gains) losses from sale of assets									0	0	0
Net decrease (increase) in noncash operating working capital									0	0	0
Equity in earnings									0	0	61,479
Other operating activities - net									0	0	0
Net cash provided by (used in) continuing operations										0	0
Net cash provided by (used in) discontinued operations										0	(17,887)
Net cash provided by operating activities									0	0	(17,887)
Investing Activities
Property additions									0	0	0
Proceeds from sale of assets									0	0	0
Changes in restricted cash									0	0	0
Other investing activities - net									0	0	0
Sales proceeds									0	0	93,765
Other									0	0	(7,443)
Net cash required by investing activities									0	0	86,322
Financing Activities
Purchase of treasury stock									0	0	0
Repayments of long-term debt									0	0	0
Additions to long-term debt									0	0	0
Debt issuance costs									0	0	0
Amounts related to share-based compensation									0	0	0
Net distributions to parent									0	0	(69,377)
Net cash required by financing activities									0	0	(69,377)
Net change in cash and cash equivalents									0	0	(942)
Cash and cash equivalents at January 1				$ 0				$ 0	0	0	942
Cash and cash equivalents at December 31	0				0				0	0	0
Less: Cash and cash equivalents held for sale	0				0				0	0	0
Cash and cash equivalents	$ 0				$ 0				$ 0	$ 0	$ 0

Guarantor Subsidiaries (Conso84

Guarantor Subsidiaries (Consolidating Statement Of Changes In Equity) (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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				$ 697,076				$ 792,290	$ 697,076	$ 792,290	$ 858,705
Issuance of common stock									(108)	0	0
Repurchase of common stock									(205,992)	(323,272)	(248,695)
Issuance of common stock									0	0	0
Amounts related to share-based compensation									(5,549)	(2,748)	(3,075)
Share-based compensation expense									7,495	9,314	9,015
Net income	$ 124,900	$ 67,900	$ 55,500	(3,000)	$ 43,800	$ 45,500	$ 46,300	85,900	245,264	221,492	176,340
Balance	738,402				697,076				738,402	697,076	792,290
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				468				468	468	468	468
Issuance of common stock									0	0	0
Balance	468				468				468	468	468
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				(608,001)				(294,139)	(608,001)	(294,139)	(51,073)
Issuance of common stock									(7,482)	(9,410)	(5,629)
Repurchase of common stock									(205,992)	(323,272)	(248,695)
Balance	(806,511)				(608,001)				(806,511)	(608,001)	(294,139)
APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				555,338				558,182	555,338	558,182	557,871
Issuance of common stock									(7,374)	(9,410)	(5,629)
Amounts related to share-based compensation									(5,549)	(2,748)	(3,075)
Reclassification of equity										0
Share-based compensation expense									7,495	9,314	9,015
Balance	549,910				555,338				549,910	555,338	558,182
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				749,271				527,779	749,271	527,779	351,439
Net income									245,264	221,492	176,340
Balance	994,535				749,271				994,535	749,271	527,779
Eliminations [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				(2,123,027)					(2,123,027)
Net income									(245,245)	(221,491)	(92,130)
Balance	(2,368,272)				(2,123,027)				(2,368,272)	(2,123,027)
Eliminations [Member] | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				(61)				(61)	(61)	(61)	(61)
Balance	(61)				(61)				(61)	(61)	(61)
Eliminations [Member] | Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				0				0	0	0	0
Balance	0				0				0	0	0
Eliminations [Member] | APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				(1,368,382)				(1,368,382)	(1,368,382)	(1,368,382)	(1,316,516)
Amounts related to share-based compensation											(51,866)
Balance	(1,368,382)				(1,368,382)				(1,368,382)	(1,368,382)	(1,368,382)
Eliminations [Member] | Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				(754,584)				(533,093)	(754,584)	(533,093)	(440,963)
Net income									(245,245)	(221,491)	(92,130)
Balance	(999,829)				(754,584)				(999,829)	(754,584)	(533,093)
Parent Company [Member] | Reportable Legal Entities [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				1,354,794					1,354,794
Net income									245,264	221,492	176,340
Balance	1,394,172				1,354,794				1,394,172	1,354,794
Parent Company [Member] | Reportable Legal Entities [Member] | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				468				468	468	468	468
Balance	468				468				468	468	468
Parent Company [Member] | Reportable Legal Entities [Member] | Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				(608,001)				(294,139)	(608,001)	(294,139)	(51,073)
Issuance of common stock									(7,482)	(9,410)	(5,629)
Repurchase of common stock									(205,992)	(323,272)	(248,695)
Balance	(806,511)				(608,001)				(806,511)	(608,001)	(294,139)
Parent Company [Member] | Reportable Legal Entities [Member] | APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				1,213,056				1,222,466	1,213,056	1,222,466	1,228,095
Issuance of common stock									(7,374)	(9,410)	5,629
Balance	1,205,682				1,213,056				1,205,682	1,213,056	1,222,466
Parent Company [Member] | Reportable Legal Entities [Member] | Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				749,271				527,779	749,271	527,779	351,439
Net income									245,264	221,492	176,340
Balance	994,535				749,271				994,535	749,271	527,779
Issuer [Member] | Reportable Legal Entities [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				1,258,910					1,258,910
Net income									245,264	221,492	114,861
Balance	1,506,122				1,258,910				1,506,122	1,258,910
Issuer [Member] | Reportable Legal Entities [Member] | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				1				1	1	1	1
Balance	1				1				1	1	1
Issuer [Member] | Reportable Legal Entities [Member] | Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				0				0	0	0	0
Balance	0				0				0	0	0
Issuer [Member] | Reportable Legal Entities [Member] | APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				571,117				564,551	571,117	564,551	558,611
Amounts related to share-based compensation									(5,549)	(2,748)	(3,075)
Share-based compensation expense									7,495	9,314	9,015
Balance	573,063				571,117				573,063	571,117	564,551
Issuer [Member] | Reportable Legal Entities [Member] | Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				687,792				466,300	687,792	466,300	351,439
Net income									245,264	221,492	114,861
Balance	933,056				687,792				933,056	687,792	466,300
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				52,061					52,061
Net income									(19)	(1)	(1)
Balance	52,042				52,061				52,042	52,061
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				60				60	60	60	60
Balance	60				60				60	60	60
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] | Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				0				0	0	0	0
Balance	0				0				0	0	0
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] | APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				52,004				52,004	52,004	52,004	52,004
Balance	52,004				52,004				52,004	52,004	52,004
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] | Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				(3)				(2)	(3)	(2)	(1)
Net income									(19)	(1)	(1)
Balance	(22)				(3)				(22)	(3)	(2)
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				154,338					154,338
Net income									0	0	(22,730)
Balance	154,338				154,338				154,338	154,338
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				0				0	0	0	0
Balance	0				0				0	0	0
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] | Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				0				0	0	0	0
Balance	0				0				0	0	0
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] | APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				87,543				87,543	87,543	87,543	35,677
Amounts related to share-based compensation											51,866
Balance	87,543				87,543				87,543	87,543	87,543
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] | Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				$ 66,795				$ 66,795	66,795	66,795	89,525
Net income									0	0	(22,730)
Balance	$ 66,795				$ 66,795				$ 66,795	$ 66,795	$ 66,795

Subsequent Event (Details)

Subsequent Event (Details) - Judicial Ruling [Member] - Deepwater Horizon Oil Spill [Member] - USD ($) $ in Millions	1 Months Ended
	Feb. 28, 2018	Dec. 31, 2017
Subsequent Event [Line Items]
Amount awarded to the Company		$ 58.7
Subsequent Event [Member]
Subsequent Event [Line Items]
Proceeds received from award	$ 47

Supplemental Quarterly Inform86

Supplemental Quarterly Information (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
Quarterly Financial Information Disclosure [Abstract]
Sales and other operating revenues	$ 3,379,500	$ 3,236,300	$ 3,211,100	$ 2,999,600	$ 3,055,800	$ 3,042,700	$ 3,005,800	$ 2,490,300	$ 12,826,553	$ 11,594,553	$ 12,699,411
Income (loss) from continuing operations before income taxes	51,200	108,700	89,900	(9,800)	66,800	71,800	74,100	139,300	240,022	352,031	218,289
Income (loss) from continuing operations	124,900	67,900	55,500	(3,000)	43,800	45,500	46,300	85,900	245,264	221,492	137,591
Net income	$ 124,900	$ 67,900	$ 55,500	$ (3,000)	$ 43,800	$ 45,500	$ 46,300	$ 85,900	$ 245,264	$ 221,492	$ 176,340
Income (loss) from continuing operations (per Common share)
Basic (in dollars per share)	$ 3.62	$ 1.92	$ 1.52	$ (0.08)	$ 1.16	$ 1.17	$ 1.18	$ 2.10	$ 6.85	$ 5.64	$ 3.17
Diluted (in dollars per share)	3.58	1.90	1.51	(0.08)	1.14	1.16	1.17	2.08	6.78	5.59	3.14
Net income (loss) (per Common share)
Basic (in dollars per share)	3.62	1.92	1.52	(0.08)	1.16	1.17	1.18	2.10	6.85	5.64	4.06
Diluted (in dollars per share)	3.58	1.90	1.51	(0.08)	1.14	1.16	1.17	2.08	6.78	5.59	$ 4.02
Market price of Common stock
High (in dollars per share)	81	76.85	74.49	73.42	72.56	79.29	74.16	67.18	81	79.29
Low (in dollars per share)	$ 69.11	$ 64.24	$ 65	$ 61.03	$ 57.80	$ 70.08	$ 57.42	$ 54.24	$ 61.03	$ 54.24

Schedule II - Valuation And Q87

Schedule II - Valuation And Qualifying Accounts (Details) - Allowance for Doubtful Accounts [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at January 1,	$ 1,891	$ 1,963	$ 4,456
Charged (Credited) to Expense	(797)	0	0
Deductions	0	(72)	(2,493)
Balance at December 31,	$ 1,094	$ 1,891	$ 1,963