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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2021
Income Tax Disclosure [Abstract] |
Schedule of Income Tax Expense | Income tax expense consisted of the following (in thousands):
| Years Ended December 31,
| 2021 |  | 2020 |  | 2019
Current: |  |  |  |  |
Federal | $ | 42,049 |  |  | $ | 53,297 |  |  | $ | 29,102 |
State | 12,787 |  |  | 12,106 |  |  | 9,547 |
Foreign | 213 |  |  | 446 |  |  | (88) |
| 55,049 |  |  | 65,849 |  |  | 38,561 |
Deferred: |  |  |  |  |
Federal | 27,593 |  |  | (8,988) |  |  | 15,094 |
State | 1,895 |  |  | (1,245) |  |  | 1,307 |
| 29,488 |  |  | (10,233) |  |  | 16,401 |
Total income tax expense | $ | 84,537 |  |  | $ | 55,616 |  |  | $ | 54,962 |
Schedule of Effective Income Tax Rate Reconciliation | The effective income tax rate differs from the federal corporate tax rate of 21% in 2021, 2020, and 2019 as follows (in thousands):
| Years Ended December 31,
| 2021 |  | 2020 |  | 2019
Tax at statutory rate | $ | 72,663 |  |  | $ | 47,186 |  |  | $ | 46,600 |
State income taxes, net of federal tax benefits | 11,599 |  |  | 8,580 |  |  | 8,575 |
Other, net (1) | 275 |  |  | (150) |  |  | (213) |
Total income tax expense | $ | 84,537 |  |  | $ | 55,616 |  |  | $ | 54,962 |
(1) Prior year amounts within the table have been reclassified to conform to current year presentation.
Schedule of Deferred Tax Assets and Liabilities | At December 31, deferred income tax assets and liabilities consisted of the following (in thousands):
| December 31,
| 2021 |  | 2020
Deferred income tax assets: |  |  |
Insurance and claims accruals | $ | 55,233 |  |  | $ | 54,913 |
Compensation-related accruals | 12,203 |  |  | 16,054 |
Allowance for uncollectible accounts | 3,958 |  |  | 4,070 |
Operating lease liabilities (1) | 7,033 |  |  | 2,530 |
Other (1) | 1,644 |  |  | 2,844 |
Gross deferred income tax assets | 80,071 |  |  | 80,411 |
Deferred income tax liabilities: |  |  |
Property and equipment | 305,002 |  |  | 308,145 |
Investments in equity securities | 10,985 |  |  | — |
Prepaid expenses | 7,269 |  |  | 6,333 |
Operating lease right-of-use assets (1) | 6,955 |  |  | 2,485 |
Investment in partnership | 17,076 |  |  | — |
Other (1) | 1,283 |  |  | 1,318 |
Gross deferred income tax liabilities | 348,570 |  |  | 318,281 |
Net deferred income tax liability | $ | 268,499 |  |  | $ | 237,870 |
Schedule of Unrecognized Tax Benefits Roll Forward | The reconciliations of beginning and ending gross balances of unrecognized tax benefits for 2021 and 2020 are shown below (in thousands).
| December 31,
| 2021 |  | 2020
Unrecognized tax benefits, beginning balance | $ | 2,363 |  |  | $ | 2,541 |
Gross increases – tax positions in prior period | 65 |  |  | 92 |
Gross increases – current period tax positions | 320 |  |  | 220 |
Settlements | (323) |  |  | (490) |
Unrecognized tax benefits, ending balance | $ | 2,425 |  |  | $ | 2,363 |

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