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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pretax income (loss) from domestic and foreign sources [Abstract]      
Domestic $ 945,562 $ 284,147 $ 105,341
Foreign 3,289 2,164 2,890
Income before income taxes 948,851 286,311 108,231
Deferred income tax provision (benefit) [Abstract]      
Federal 201,725 66,401 13,700
State 48,332 17,434 4,574
Foreign 12 0 7
Total current 250,069 83,835 18,281
Federal (12,149) 22,321 7,430
State (2,484) 4,529 925
Foreign 929 647 670
Total deferred (13,704) 27,497 9,025
Income tax provision 236,365 111,332 27,306
Income Tax Rate Reconciliation [Abstract]      
Income before income taxes $ 948,851 $ 286,311 $ 108,231
Statutory U.S. income tax rate (as a percent) 21.00% 21.00% 21.00%
Statutory tax provision $ 199,259 $ 60,125 $ 22,728
State taxes 35,705 12,267 4,390
Stranded tax effects of Plan Termination 0 38,794 [1] 0
Unrecognized tax benefits 2 87 (178)
Tax credits (620) (712) (725)
Foreign rate differential 236 65 71
Share-based compensation (563) (411) (532)
Nondeductible executive compensation 1,664 808 852
Meals and entertainment 336 340 738
Other 346 (31) (38)
Income tax provision $ 236,365 $ 111,332 $ 27,306
Effective income tax rate (as a percent) 24.90% 38.90% 25.20%
Income taxes paid (refunds), net $ 260,100 $ 75,100 $ (1,400)
Deferred tax assets [Abstract]      
Employee benefits 28,534 29,258  
Lease Liabilities 24,956 25,057  
Inventories 4,100 3,711  
Foreign net operating loss carryforward 1,685 1,279  
Other 7,170 6,921  
Deferred Tax Assets, Gross 66,445 66,226  
Net deferred tax assets 2,948    
Deferred tax liabilities [Abstract]      
Property and equipment (32,040) (45,652)  
Right-of-use assets (22,950) (23,256)  
Intangible assets and other (6,850) (6,823)  
Other (1,657) (1,298)  
Deferred tax liabilities (63,497) (77,029)  
Total deferred tax liabilities, net   (10,803)  
Reconciliation of unrecognized tax benefits, roll forward      
Balance as of January 1 1,780 1,685 1,850
Increases related to prior years' tax positions 0 97 0
Increases related to current years' tax positions 28 89 53
Decreases related to prior years' tax positions (19) 0 0
Lapse of statute of limitations (7) (91) (218)
Balance as of December 31 1,782 1,780 1,685
Unrecognized tax benefits that would impact tax rate 1,800 $ 1,800 $ 1,700
State and Local Jurisdiction [Member]      
Deferred tax liabilities [Abstract]      
State income tax credits, subject to expiration 1,900    
CANADA | Subsidiaries [Member]      
Deferred tax liabilities [Abstract]      
Foreign net operating loss carryforwards, subject to expiration $ 11,100    
[1] In December 2020, we eliminated our qualified defined benefit pension plan (Plan Termination), as discussed in Note 11, 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.