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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Schedule of Income Tax Expense | Income tax expense consisted of the following (in thousands):
| Years Ended December 31,
| 2020 |  | 2019 |  | 2018
Current: |  |  |  |  |
Federal | $ | 53,297 |  |  | $ | 29,102 |  |  | $ | 7,428 |
State | 12,106 |  |  | 9,547 |  |  | 9,841 |
Foreign | 446 |  |  | (88) |  |  | 770 |
| 65,849 |  |  | 38,561 |  |  | 18,039 |
Deferred: |  |  |  |  |
Federal | (8,988) |  |  | 15,094 |  |  | 37,284 |
State | (1,245) |  |  | 1,307 |  |  | 410 |
| (10,233) |  |  | 16,401 |  |  | 37,694 |
Total income tax expense | $ | 55,616 |  |  | $ | 54,962 |  |  | $ | 55,733 |
Schedule of Effective Income Tax Rate Reconciliation | The effective income tax rate differs from the federal corporate tax rate of 21% in 2020, 2019, and 2018 as follows (in thousands):
| Years Ended December 31,
| 2020 |  | 2019 |  | 2018
Tax at statutory rate | $ | 47,186 |  |  | $ | 46,600 |  |  | $ | 47,015 |
State income taxes, net of federal tax benefits | 8,580 |  |  | 8,575 |  |  | 8,098 |
Non-deductible meals and entertainment | 903 |  |  | 1,117 |  |  | 1,044 |
Income tax credits | (1,200) |  |  | (1,600) |  |  | (1,800) |
Equity compensation | (821) |  |  | (207) |  |  | (312) |
Other, net | 968 |  |  | 477 |  |  | 1,688 |
Total income tax expense | $ | 55,616 |  |  | $ | 54,962 |  |  | $ | 55,733 |
Schedule of Deferred Tax Assets and Liabilities | At December 31, deferred income tax assets and liabilities consisted of the following (in thousands):
| December 31,
| 2020 |  | 2019
Deferred income tax assets: |  |  |
Insurance and claims accruals | $ | 54,913 |  |  | $ | 48,537 |
Compensation-related accruals | 16,054 |  |  | 8,067 |
Allowance for uncollectible accounts | 4,070 |  |  | 3,690 |
Other | 5,374 |  |  | 1,863 |
Gross deferred income tax assets | 80,411 |  |  | 62,157 |
Deferred income tax liabilities: |  |  |
Property and equipment | 308,145 |  |  | 305,575 |
Prepaid expenses | 6,333 |  |  | 4,928 |
Other | 3,803 |  |  | 1,323 |
Gross deferred income tax liabilities | 318,281 |  |  | 311,826 |
Net deferred income tax liability | $ | 237,870 |  |  | $ | 249,669 |
Reconciliation of Unrecognized Tax Benefits | The reconciliations of beginning and ending gross balances of unrecognized tax benefits for 2020 and 2019 are shown below (in thousands).
| December 31,
| 2020 |  | 2019
Unrecognized tax benefits, beginning balance | $ | 2,541 |  |  | $ | 2,577 |
Gross increases – tax positions in prior period | 92 |  |  | 127 |
Gross increases – current period tax positions | 220 |  |  | 222 |
Settlements | (490) |  |  | (385) |
Unrecognized tax benefits, ending balance | $ | 2,363 |  |  | $ | 2,541 |

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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