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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Taxes |
Schedule of components of income from continuing operations before income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended
​ | ​ | December 31,
​ | ​ | 2020 | ​ | 2019 | ​ | 2018
Domestic | ​ | $ | 2,260,385 | ​ | $ | 1,790,207 | ​ | $ | 1,694,087
International | ​ | ​ | 6,020 | ​ | ​ | 122 | ​ | ​ | —
Income before income taxes | ​ | $ | 2,266,405 | ​ | $ | 1,790,329 | ​ | $ | 1,694,087
Schedule of components of the provision for income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended
​ | ​ | December 31,
​ |  | 2020 |  | 2019 |  | 2018
Current: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal income tax expense | ​ | $ | 401,331 | ​ | $ | 315,061 | ​ | $ | 289,953
State income tax expense | ​ |  | 97,085 | ​ |  | 62,795 | ​ |  | 59,487
International income tax expense | ​ | ​ | 3,306 | ​ | ​ | 273 | ​ | ​ | —
Total current | ​ | ​ | 501,722 | ​ | ​ | 378,129 | ​ | ​ | 349,440
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal income tax expense | ​ | ​ | 16,749 | ​ | ​ | 19,367 | ​ | ​ | 16,309
State income tax (benefit) expense | ​ | ​ | (2,865) | ​ | ​ | 2,027 | ​ | ​ | 3,851
International income tax benefit | ​ | ​ | (1,503) | ​ | ​ | (236) | ​ | ​ | —
Total deferred | ​ | ​ | 12,381 | ​ | ​ | 21,158 | ​ | ​ | 20,160
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income tax expense | ​ | $ | 514,103 | ​ | $ | 399,287 | ​ | $ | 369,600
Reconciliation of the provision for income taxes to the amounts computed at the federal statutory rate | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended
​ | ​ | December 31,
​ |  | 2020 |  | 2019 |  | 2018
Federal income taxes at statutory rate | ​ | $ | 474,681 | ​ | $ | 375,942 | ​ | $ | 355,758
State income taxes, net of federal tax benefit | ​ |  | 76,810 | ​ |  | 54,739 | ​ |  | 56,345
Excess tax benefit from share-based compensation | ​ |  | (16,918) | ​ |  | (25,992) | ​ |  | (34,703)
Revaluation of deferred tax liability | ​ |  | — | ​ |  | — | ​ |  | (1,262)
Benefit from investment in renewable energy tax credits | ​ | ​ | (17,904) | ​ | ​ | (875) | ​ | ​ | (2,037)
Other items, net | ​ |  | (2,566) | ​ |  | (4,527) | ​ |  | (4,501)
Total provision for income taxes | ​ | $ | 514,103 | ​ | $ | 399,287 | ​ | $ | 369,600
Schedule of deferred tax assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2019
Deferred tax assets: |  | ​ |  |  | ​ |
Allowance for doubtful accounts | ​ | $ | 1,574 | ​ | $ | 2,008
Tax credits | ​ |  | 1,444 | ​ |  | 3,417
Other accruals | ​ |  | 143,387 | ​ |  | 97,189
Operating lease liability | ​ | ​ | 513,134 | ​ | ​ | 494,093
Other | ​ |  | 16,594 | ​ |  | 15,732
Total deferred tax assets | ​ |  | 676,133 | ​ |  | 612,439
​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax liabilities: | ​ |  |  | ​ |  |
Inventories | ​ |  | 79,326 | ​ |  | 65,346
Property and equipment | ​ |  | 194,000 | ​ |  | 162,613
Operating lease asset | ​ | ​ | 498,042 | ​ | ​ | 479,821
Other | ​ |  | 60,664 | ​ |  | 37,939
Total deferred tax liabilities | ​ |  | 832,032 | ​ |  | 745,719
​ | ​ | ​ | ​ | ​ | ​ | ​
Net deferred tax liabilities | ​ | $ | (155,899) | ​ | $ | (133,280)
Summary of changes in gross amount of unrecognized tax benefits, excluding interest and penalties | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018
Unrealized tax benefit, balance at January 1, | ​ | $ | 31,475 | ​ | $ | 33,766 | ​ | $ | 35,388
Additions based on tax positions related to the current year | ​ |  | 4,795 | ​ |  | 4,627 | ​ |  | 3,550
Additions based on tax positions related to prior years | ​ |  | — | ​ |  | — | ​ |  | 4,255
Payments related to items settled with taxing authorities | ​ |  | — | ​ |  | (443) | ​ |  | (2,792)
Reductions due to the lapse of statute of limitations and settlements | ​ |  | (5,303) | ​ |  | (6,475) | ​ |  | (6,635)
Unrealized tax benefit, balance at December 31, | ​ | $ | 30,967 | ​ | $ | 31,475 | ​ | $ | 33,766

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