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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%.

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