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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
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
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

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