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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Income Tax Disclosure [Abstract] |  |
Claims and insurance reserves | $ 27,433 | $ 29,008
Accrued vacation | 17,932 | 17,832
Deferred compensation | 31,306 | 29,220
Other | 20,861 | 15,157
Total deferred tax assets | 97,532 | 91,217
Depreciation and amortization | (339,311) | (266,730)
Unrecognized revenue |  | (10,007)
Other | (3,151) | (1,703)
Total deferred tax liabilities | (342,462) | (278,440)
Net deferred tax liability | $ (244,930) | $ (187,223)

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