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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Income Tax Disclosure [Abstract] |  |
Insurance and claims accruals | $ 74,015 | $ 71,285
Compensation - related liabilities | 10,056 | 10,187
Allowance for uncollectible accounts | 6,135 | 6,138
Other | 4,168 | 6,291
Gross deferred tax assets | 94,374 | 93,901
Property and equipment | 377,093 | 330,580
Prepaid expenses | 7,737 | 7,229
Other | 2,313 | 2,356
Gross deferred tax liabilities | 387,143 | 340,165
Net deferred tax liability | $ 292,769 | $ 246,264

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