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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax Disclosure [Abstract] |  |
Claims and insurance reserves | $ 28,863 | $ 28,390
Accrued vacation | 15,867 | 17,642
Deferred compensation | 43,134 | 42,417
Other | 29,451 | 11,843
Total deferred tax assets | 117,315 | 100,292
Depreciation and amortization | (330,751) | (354,762)
Other | (3,640) | (3,617)
Total deferred tax liabilities | (334,391) | (358,379)
Net deferred tax liability | $ (217,076) | $ (258,087)

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