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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2021
Income Taxes |
Schedule of components of income from continuing operations before income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended
​ | ​ | December 31,
​ | ​ | 2021 | ​ | 2020 | ​ | 2019
Domestic | ​ | $ | 2,770,485 | ​ | $ | 2,260,385 | ​ | $ | 1,790,207
International | ​ | ​ | 11,429 | ​ | ​ | 6,020 | ​ | ​ | 122
Income before income taxes | ​ | $ | 2,781,914 | ​ | $ | 2,266,405 | ​ | $ | 1,790,329
Schedule of components of the provision for income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended
​ | ​ | December 31,
​ |  | 2021 |  | 2020 |  | 2019
Current: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal income tax expense | ​ | $ | 485,988 | ​ | $ | 401,331 | ​ | $ | 315,061
State income tax expense | ​ |  | 104,837 | ​ |  | 97,085 | ​ |  | 62,795
International income tax expense | ​ | ​ | 6,021 | ​ | ​ | 3,306 | ​ | ​ | 273
Total current | ​ | ​ | 596,846 | ​ | ​ | 501,722 | ​ | ​ | 378,129
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal income tax expense | ​ | ​ | 20,543 | ​ | ​ | 16,749 | ​ | ​ | 19,367
State income tax (benefit) expense | ​ | ​ | 2,432 | ​ | ​ | (2,865) | ​ | ​ | 2,027
International income tax benefit | ​ | ​ | (2,592) | ​ | ​ | (1,503) | ​ | ​ | (236)
Total deferred | ​ | ​ | 20,383 | ​ | ​ | 12,381 | ​ | ​ | 21,158
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income tax expense | ​ | $ | 617,229 | ​ | $ | 514,103 | ​ | $ | 399,287
Reconciliation of the provision for income taxes to the amounts computed at the federal statutory rate | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended
​ | ​ | December 31,
​ |  | 2021 |  | 2020 |  | 2019
Federal income taxes at statutory rate | ​ | $ | 584,202 | ​ | $ | 474,681 | ​ | $ | 375,942
State income taxes, net of federal tax benefit | ​ |  | 90,360 | ​ |  | 76,810 | ​ |  | 54,739
Excess tax benefit from share-based compensation | ​ |  | (35,202) | ​ |  | (16,918) | ​ |  | (25,992)
Benefit from investment in renewable energy tax credits | ​ | ​ | (18,592) | ​ | ​ | (17,904) | ​ | ​ | (875)
Other items, net | ​ |  | (3,539) | ​ |  | (2,566) | ​ |  | (4,527)
Total provision for income taxes | ​ | $ | 617,229 | ​ | $ | 514,103 | ​ | $ | 399,287
Schedule of deferred tax assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2021 |  | 2020
Deferred tax assets: |  | ​ |  |  | ​ |
Allowance for doubtful accounts | ​ | $ | 1,538 | ​ | $ | 1,574
Tax credits | ​ |  | 284 | ​ |  | 1,444
Other accruals | ​ |  | 142,714 | ​ |  | 143,387
Operating lease liability | ​ | ​ | 513,492 | ​ | ​ | 513,134
Other | ​ |  | 16,117 | ​ |  | 16,594
Total deferred tax assets | ​ |  | 674,145 | ​ |  | 676,133
​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax liabilities: | ​ |  |  | ​ |  |
Inventories | ​ |  | 64,562 | ​ |  | 79,326
Property and equipment | ​ |  | 212,649 | ​ |  | 194,000
Operating lease asset | ​ | ​ | 496,996 | ​ | ​ | 498,042
Other | ​ |  | 75,150 | ​ |  | 60,664
Total deferred tax liabilities | ​ |  | 849,357 | ​ |  | 832,032
​ | ​ | ​ | ​ | ​ | ​ | ​
Net deferred tax liabilities | ​ | $ | (175,212) | ​ | $ | (155,899)
Summary of changes in gross amount of unrecognized tax benefits, excluding interest and penalties | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020 |  | 2019
Unrealized tax benefit, balance at January 1, | ​ | $ | 30,967 | ​ | $ | 31,475 | ​ | $ | 33,766
Additions based on tax positions related to the current year | ​ |  | 5,446 | ​ |  | 4,795 | ​ |  | 4,627
Payments related to items settled with taxing authorities | ​ |  | (2,570) | ​ |  | — | ​ |  | (443)
Reductions due to the lapse of statute of limitations and settlements | ​ |  | (6,996) | ​ |  | (5,303) | ​ |  | (6,475)
Unrealized tax benefit, balance at December 31, | ​ | $ | 26,847 | ​ | $ | 30,967 | ​ | $ | 31,475

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