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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Pretax income (loss) from domestic and foreign sources [Abstract]          
Domestic   $ 284,147 $ 105,341 $ 21,704  
Foreign   2,164 2,890 398  
Income before income taxes   286,311 108,231 22,102  
Deferred income tax provision (benefit) [Abstract]          
Federal   66,401 13,700 6,459  
State   17,434 4,574 3,126  
Foreign   0 7 5  
Total current   83,835 18,281 9,590  
Federal   22,321 7,430 (5,987)  
State   4,529 925 (2,127)  
Foreign   647 670 149  
Total deferred   27,497 9,025 (7,965)  
Income tax provision   111,332 27,306 1,625  
Income Tax Rate Reconciliation [Abstract]          
Income before income taxes   $ 286,311 $ 108,231 $ 22,102  
Statutory U.S. income tax rate (as a percent)   21.00% 21.00% 21.00% 35.00%
Statutory tax provision   $ 60,125 $ 22,728 $ 4,642  
State taxes   12,267 4,390 741  
Stranded tax effects of Plan Termination $ 38,800 38,794 [1] 0 0  
Unrecognized tax benefits   87 (178) (181)  
Benefit from enactment of the Tax Act   0 0 (3,806) [2]  
Tax credits   (712) (725) (272)  
Foreign rate differential   65 71 432  
Share-based compensation   (411) (532) (1,718)  
Nondeductible executive compensation   808 852 366  
Meals and entertainment   340 738 886  
Other   (31) (38) 535  
Income tax provision   $ 111,332 $ 27,306 $ 1,625  
Effective income tax rate (as a percent)   38.90% 25.20% 7.40%  
Income taxes paid (refunds), net   $ 75,100 $ (1,400) $ 14,500  
Deferred tax assets [Abstract]          
Employee benefits 29,258 29,258 26,914    
Lease Liabilities 25,057 25,057 23,241    
Inventories 3,711 3,711 3,358    
Foreign net operating loss carryforward 1,279 1,279 1,514    
Other 6,921 6,921 6,256    
Net deferred tax assets 66,226 66,226 61,283    
Deferred tax liabilities [Abstract]          
Property and equipment (45,652) (45,652) (50,751)    
Right-of-use assets (23,256) (23,256) (21,753)    
Intangible assets and other (6,823) (6,823) (5,924)    
Other (1,298) (1,298) (1,597)    
Deferred tax liabilities (77,029) (77,029) (80,025)    
Total deferred tax liabilities, net (10,803) (10,803) (18,742)    
Reconciliation of unrecognized tax benefits, roll forward          
Balance as of January 1   1,685 1,850 2,083  
Increases related to prior years' tax positions   97 0 13  
Increases related to current years' tax positions   89 53 0  
Decreases related to prior years' tax positions   0 0 (43)  
Lapse of statute of limitations   (91) (218) (203)  
Balance as of December 31 1,780 1,780 1,685 1,850 $ 2,083
Unrecognized tax benefits that would impact tax rate 1,800 1,800 $ 1,700 $ 1,800  
State and Local Jurisdiction [Member]          
Deferred tax liabilities [Abstract]          
State income tax credits, subject to expiration 1,300 1,300      
CANADA | Subsidiaries [Member]          
Deferred tax liabilities [Abstract]          
Foreign net operating loss carryforwards, subject to expiration $ 9,900 $ 9,900      
[1] In December 2020, we eliminated our qualified defined benefit pension plan (Plan Termination), as discussed in Note 12, Retirement and Benefit Plans. Prior to the Plan Termination, "Accumulated other comprehensive loss" on our Consolidated Balance Sheet included the stranded tax effects of our conversion from a limited liability company to a corporation in 2013 and the adoption of the Tax Cuts and Jobs Act (the "Tax Act") in 2017. Upon Plan Termination, these stranded tax effects of $38.8 million were required to be released into income tax expense under GAAP.
[2] As of December 31, 2018, we completed our assessment of the effects of the Tax Act on our financial statements. In connection with our analysis of the Tax Act, we recorded a discrete tax benefit of $3.8 million during the year ended December 31, 2018. The $3.8 million reduction in income tax expense resulted from the remeasurement of deferred income taxes to the new federal statutory rate of 21%, which mostly related to a $20.0 million discretionary pension contribution made during 2018, for which we received a tax deduction at the 2017 federal income tax rate of 35%.