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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2021
Income Tax Disclosure [Abstract] |
Reconciliation of Effective Tax Rate to Federal Statutory Tax Rate | The following is a reconciliation of our effective tax rate to the federal statutory tax rate:
| Years Ended December 31, |  |
| 2021 |  |  | 2020 |  |  | 2019 |  |
U.S. federal statutory rate |  | 21.0 |  | % |  | 21.0 |  | % |  | 21.0 |  | %
State taxes, net of federal benefit |  | 3.5 |  |  |  | 3.6 |  |  |  | 3.5 |  |
Federal and state incentives |  | (0.5 | ) |  |  | (1.1 | ) |  |  | (0.9 | ) |
State law changes |  | 1.1 |  |  |  | (0.2 | ) |  |  | 0.7 |  |
Permanent differences |  | 0.6 |  |  |  | 0.2 |  |  |  | 1.2 |  |
Net effective rate |  | 25.7 |  | % |  | 23.5 |  | % |  | 25.5 |  | %
Summary of Provision for Income Taxes | The following is a summary of our provision for income taxes (in thousands):
| Years Ended December 31, |
| 2021 |  |  | 2020 |  |  | 2019 |
Current |  |  |  |  |  |  |  |
Federal | $ | 51,918 |  |  | $ | 11,913 |  |  | $ | 31,209 |
State and local |  | 13,876 |  |  |  | 3,597 |  |  |  | 3,979 |
Foreign |  | 38 |  |  |  | 11 |  |  |  | 84 |
|  | 65,832 |  |  |  | 15,521 |  |  |  | 35,272 |
Deferred |  |  |  |  |  |  |  |
Federal |  | (5,125 | ) |  |  | 6,548 |  |  |  | (344 | )
State and local |  | (1,254 | ) |  |  | 465 |  |  |  | 1,788 |
Foreign |  | (17 | ) |  |  | 7 |  |  |  | (17 | )
|  | (6,396 | ) |  |  | 7,020 |  |  |  | 1,427 |
Total provision | $ | 59,436 |  |  | $ | 22,541 |  |  | $ | 36,699 |
Summary of Deferred Tax Assets and Liabilities | The following is a summary of our deferred tax assets and liabilities (in thousands):
| December 31, |
| 2021 |  |  | 2020 |
Accrued compensation |  | 19,226 |  |  |  | 12,467 |
Other reserves |  | 17,896 |  |  |  | 14,154 |
Tax credit carryforwards |  | 8,286 |  |  |  | 8,715 |
Operating loss carryforwards |  | 881 |  |  |  | 2,845 |
Lease accounting liability |  | 11,956 |  |  |  | 11,669 |
Total gross deferred income taxes |  | 58,245 |  |  |  | 49,850 |
Valuation allowances |  | (5,023 | ) |  |  | (6,518 | )
Total deferred tax assets |  | 53,222 |  |  |  | 43,332 |
Prepaids |  | (6,607 | ) |  |  | (6,404 | )
Property and equipment |  | (135,768 | ) |  |  | (132,669 | )
Intangibles |  | (55,466 | ) |  |  | (55,166 | )
Lease right-of-use asset |  | (11,325 | ) |  |  | (11,418 | )
Total deferred tax liabilities |  | (209,166 | ) |  |  | (205,657 | )
Total deferred taxes | $ | (155,944 | ) |  | $ | (162,325 | )
Unrecognized Tax Benefits | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):
| 2021 |  |  | 2020 |
Gross unrecognized tax benefits - beginning of the year | $ | 4,292 |  |  | $ | 4,069 |
Gross increases (decreases) related to prior year tax positions |  | 997 |  |  |  | (52 | )
Gross increases related to current year tax positions |  | 1,794 |  |  |  | 1,484 |
Lapse of applicable statute of limitations |  | (436 | ) |  |  | (1,209 | )
Gross unrecognized tax benefits - end of year | $ | 6,647 |  |  | $ | 4,292 |

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