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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2021
Income Tax Disclosure [Abstract] |
Income before Income Tax, Domestic and Foreign [Table Text Block] | Income before income taxes includes the following components:
|  | Year Ended December 31
|  | 2021 |  | 2020 |  | 2019
|  | (thousands)
Domestic |  | $ | 945,562 |  |  | $ | 284,147 |  |  | $ | 105,341 |
Foreign |  | 3,289 |  |  | 2,164 |  |  | 2,890 |
Income before income taxes |  | $ | 948,851 |  |  | $ | 286,311 |  |  | $ | 108,231 |
Income Tax Provision [Table Text Block] | The income tax provision shown in the Consolidated Statements of Operations includes the following:
|  | Year Ended December 31
|  | 2021 |  | 2020 |  | 2019
|  | (thousands)
Current income tax provision |  |  |  |  |  |
Federal |  | $ | 201,725 |  |  | $ | 66,401 |  |  | $ | 13,700 |
State |  | 48,332 |  |  | 17,434 |  |  | 4,574 |
Foreign |  | 12 |  |  | — |  |  | 7 |
Total current |  | 250,069 |  |  | 83,835 |  |  | 18,281 |
Deferred income tax provision (benefit) |  |  |  |  |  |
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 [Table Text Block] | The effective tax rate varies from the U.S. Federal statutory income tax rate principally due to the following:
|  | Year Ended December 31
|  | 2021 |  | 2020 |  | 2019
|  | (thousands, except percentages)
Income before income taxes |  | $ | 948,851 |  |  | $ | 286,311 |  |  | $ | 108,231 |
Statutory U.S. income tax rate |  | 21.0 | % |  | 21.0 | % |  | 21.0 | %
Statutory tax provision |  | $ | 199,259 |  |  | $ | 60,125 |  |  | $ | 22,728 |
State taxes |  | 35,705 |  |  | 12,267 |  |  | 4,390 |
Stranded tax effects of Plan Termination (a) |  | — |  |  | 38,794 |  |  | — |
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) |
Total |  | $ | 236,365 |  |  | $ | 111,332 |  |  | $ | 27,306 |
Effective income tax rate |  | 24.9 | % |  | 38.9 | % |  | 25.2 | %
______________________________________ (a) 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.
Net Deferred Tax Assets and Liabilities [Table Text Block] | The components of our net deferred tax assets and liabilities at December 31, 2021 and 2020, are summarized as follows:
|  | December 31, 2021 |  | December 31, 2020
|  | (thousands)
Deferred tax assets |  |  |  |
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 |  | $ | 66,445 |  |  | $ | 66,226 |
Deferred tax liabilities |  |  |  |
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 assets (liabilities), net |  | $ | 2,948 |  |  | $ | (10,803) |
Unrecognized Tax Benefits Roll Forward [Table Text Block] | The following table summarizes the changes related to our gross unrecognized tax benefits excluding interest and penalties:
|  | 2021 |  | 2020 |  | 2019
|  | (thousands)
Balance as of January 1 |  | $ | 1,780 |  |  | $ | 1,685 |  |  | $ | 1,850 |
Increases related to prior years' tax positions |  | — |  |  | 97 |  |  | — |
Increases related to current years' tax positions |  | 28 |  |  | 89 |  |  | 53 |
Decreases related to prior years' tax positions |  | (19) |  |  | — |  |  | — |
Lapse of statute of limitations |  | (7) |  |  | (91) |  |  | (218) |
Balance as of December 31 |  | $ | 1,782 |  |  | $ | 1,780 |  |  | $ | 1,685 |

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