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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
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
|  | 2020 |  | 2019 |  | 2018
|  | (thousands)
Domestic |  | $ | 284,147 |  |  | $ | 105,341 |  |  | $ | 21,704 |
Foreign |  | 2,164 |  |  | 2,890 |  |  | 398 |
Income before income taxes |  | $ | 286,311 |  |  | $ | 108,231 |  |  | $ | 22,102 |
Income Tax Provision [Table Text Block] | The income tax provision shown in the Consolidated Statements of Operations includes the following:
|  | Year Ended December 31
|  | 2020 |  | 2019 |  | 2018
|  | (thousands)
Current income tax provision |  |  |  |  |  |
Federal |  | $ | 66,401 |  |  | $ | 13,700 |  |  | $ | 6,459 |
State |  | 17,434 |  |  | 4,574 |  |  | 3,126 |
Foreign |  | — |  |  | 7 |  |  | 5 |
Total current |  | 83,835 |  |  | 18,281 |  |  | 9,590 |
Deferred income tax provision (benefit) |  |  |  |  |  |
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 [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
|  | 2020 |  | 2019 |  | 2018
|  | (thousands, except percentages)
Income before income taxes |  | $ | 286,311 |  |  | $ | 108,231 |  |  | $ | 22,102 |
Statutory U.S. income tax rate |  | 21.0 | % |  | 21.0 | % |  | 21.0 | %
Statutory tax provision |  | $ | 60,125 |  |  | $ | 22,728 |  |  | $ | 4,642 |
State taxes |  | 12,267 |  |  | 4,390 |  |  | 741 |
Stranded tax effects of Plan Termination (a) |  | 38,794 |  |  | — |  |  | — |
Unrecognized tax benefits |  | 87 |  |  | (178) |  |  | (181) |
Benefit from enactment of the Tax Act (b) |  | — |  |  | — |  |  | (3,806) |
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 |
Total |  | $ | 111,332 |  |  | $ | 27,306 |  |  | $ | 1,625 |
Effective income tax rate |  | 38.9 | % |  | 25.2 | % |  | 7.4 | %
______________________________________ (a) 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. (b) 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%.
Net Deferred Tax Assets and Liabilities [Table Text Block] | The components of our net deferred tax assets and liabilities at December 31, 2020 and 2019, are summarized as follows:
|  | December 31, 2020 |  | December 31, 2019
|  | (thousands)
Deferred tax assets |  |  |  |
Employee benefits |  | $ | 29,258 |  |  | $ | 26,914 |
Lease liabilities |  | 25,057 |  |  | 23,241 |
Inventories |  | 3,711 |  |  | 3,358 |
Foreign net operating loss carryforward |  | 1,279 |  |  | 1,514 |
Other |  | 6,921 |  |  | 6,256 |
Deferred tax assets |  | $ | 66,226 |  |  | $ | 61,283 |
Deferred tax liabilities |  |  |  |
Property and equipment |  | $ | (45,652) |  |  | $ | (50,751) |
Right-of-use assets |  | (23,256) |  |  | (21,753) |
Intangible assets and other |  | (6,823) |  |  | (5,924) |
Other |  | (1,298) |  |  | (1,597) |
Deferred tax liabilities |  | $ | (77,029) |  |  | $ | (80,025) |
Total deferred tax liabilities, net |  | $ | (10,803) |  |  | $ | (18,742) |
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:
|  | 2020 |  | 2019 |  | 2018
|  | (thousands)
Balance as of January 1 |  | $ | 1,685 |  |  | $ | 1,850 |  |  | $ | 2,083 |
Increases related to prior years' tax positions |  | 97 |  |  | — |  |  | 13 |
Increases related to current years' tax positions |  | 89 |  |  | 53 |  |  | — |
Decreases related to prior years' tax positions |  | — |  |  | — |  |  | (43) |
Lapse of statute of limitations |  | (91) |  |  | (218) |  |  | (203) |
Balance as of December 31 |  | $ | 1,780 |  |  | $ | 1,685 |  |  | $ | 1,850 |

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