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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Insurance and claims accruals | $ 48,537 | $ 47,031
Compensation - related accruals | 8,067 | 7,413
Allowance for uncollectible accounts | 3,690 | 3,628
Other | 1,863 | 1,896
Gross deferred income tax assets | 62,157 | 59,968
Property and equipment | 305,575 | 287,061
Prepaid expenses | 4,928 | 4,772
Other | 1,323 | 1,585
Gross deferred income tax liabilities | 311,826 | 293,418
Net deferred income tax liability | $ 249,669 | $ 233,450

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