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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Claims and insurance reserves | $ 29,008 | $ 43,409
Accrued vacation | 17,832 | 24,227
Deferred compensation | 29,220 | 40,742
Other | 15,157 | 11,593
Total deferred tax assets | 91,217 | 119,971
Depreciation | (266,730) | (376,034)
Unrecognized revenue | (10,007) | (11,465)
Other | (1,703) | (2,334)
Deferred Tax Liabilities, Gross | 278,440 | 389,833
Total deferred tax liabilities | $ (187,223) | $ (269,862)

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