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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Income Tax Disclosure [Abstract] |  |
Insurance and claims accruals | $ 41,986 | $ 74,015
Compensation - related accruals | 6,797 | 10,056
Allowance for uncollectible accounts | 3,599 | 6,135
Other | 1,979 | 4,168
Gross deferred income tax assets | 54,361 | 94,374
Property and equipment | 243,482 | 377,093
Prepaid expenses | 4,699 | 7,737
Other | 1,367 | 2,313
Gross deferred income tax liabilities | 249,548 | 387,143
Net deferred income tax liability | $ 195,187 | $ 292,769

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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