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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
Income Taxes |
Schedule of components of income tax expense (benefit) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2023 |  | 2022 |  | 2021
Current: |  | ​ |  |  | ​ |  |  | ​ |
Federal | ​ | $ | 54,097 | ​ | $ | 50,194 | ​ | $ | 59,450
State | ​ |  | 39 | ​ |  | 5,017 | ​ |  | 5,822
​ | ​ |  | 54,136 | ​ |  | 55,211 | ​ |  | 65,272
Deferred: | ​ |  |  | ​ |  |  | ​ |  |
Federal | ​ |  | 229 | ​ |  | (578) | ​ |  | 5,050
State | ​ |  | 325 | ​ |  | 811 | ​ |  | 623
​ | ​ |  | 554 | ​ |  | 233 | ​ |  | 5,673
Tax expense recorded as an increase of paid-in capital | ​ |  | — | ​ |  | — | ​ |  | —
​ | ​ | $ | 54,690 | ​ | $ | 55,444 | ​ | $ | 70,945
Schedule of effective income tax rate reconciliation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
​ |  | 2023 |  | 2022 |  | 2021 |
Statutory U.S. federal income tax rate |  | 21.0 | % | 21.0 | % | 21.0 | %
State income taxes, net of federal tax benefit |  | 2.8 |  | 2.8 |  | 2.4 | ​
State tax credits, net of federal effect |  | (1.0) |  | (1.6) |  | (1.2) | ​
Excess tax benefits |  | (0.3) |  | (0.1) |  | (1.3) | ​
Nondeductible expenses |  | 0.3 |  | 0.2 |  | 0.1 | ​
Other |  | (1.7) |  | 0.8 |  | 0.4 | ​
Effective income tax rate |  | 21.1 | % | 23.1 | % | 21.4 | %
Schedule of deferred tax assets and liabilities | Significant components of the Company’s deferred income tax assets and liabilities, included in Deferred income taxes, non-current on the consolidated balance sheets are as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | As of December 31, |  | As of December 31,
​ |  | 2023 |  | 2022
Deferred tax assets: |  | ​ |  |  | ​ |
Share-based compensation | ​ | $ | 2,850 | ​ | $ | 2,725
Employee compensation | ​ |  | 1,262 | ​ |  | 1,109
Intangibles | ​ |  | 11,696 | ​ |  | 14,872
Leases | ​ | ​ | 1,780 | ​ | ​ | 1,270
State taxes | ​ |  | 3,641 | ​ |  | 3,998
Other | ​ |  | 329 | ​ |  | 232
Deferred tax assets | ​ |  | 21,558 | ​ |  | 24,206
​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax liability: | ​ |  |  | ​ |  |
Property and equipment | ​ |  | (11,256) | ​ |  | (13,350)
Goodwill | ​ |  | (37,051) | ​ |  | (37,051)
Other | ​ |  | — | ​ |  | —
Deferred tax liability | ​ |  | (48,307) | ​ |  | (50,401)
Net deferred tax liability | ​ | $ | (26,749) | ​ | $ | (26,195)
​ The net deferred tax liability on the accompanying consolidated balance sheet is comprised of the following:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | As of December 31, |  | As of December 31,
​ |  | 2023 |  | 2022
Deferred income taxes, current | ​ | $ | 5,118 | ​ | $ | 5,172
Deferred income taxes, non-current | ​ |  | (31,867) | ​ |  | (31,367)
Net deferred tax liability | ​ | $ | (26,749) | ​ | $ | (26,195)
Reconciliation of the beginning and ending balance of unrecognized tax benefits | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022
Unrecognized tax benefits, beginning of year | ​ | $ | 15,862 | ​ | $ | 14,108
Tax positions taken during the current year | ​ |  |  | ​ |  |
Increases | ​ |  | 2,891 | ​ |  | 2,814
Decreases | ​ |  | — | ​ |  | —
Tax positions taken during a prior year | ​ |  |  | ​ |  |
Increases | ​ |  | 392 | ​ |  | 1,313
Decreases | ​ |  | (1,810) | ​ |  | (1,954)
Decreases for settlements during the period | ​ |  | (384) | ​ |  | —
Reductions for lapses of applicable statute of limitations | ​ |  | (3,320) | ​ |  | (419)
Unrecognized tax benefits, end of year | ​ | $ | 13,631 | ​ | $ | 15,862

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