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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] |  |
Claims and insurance reserves | $ 43,409 | $ 41,576
Allowance for doubtful accounts | 1,198 | 1,730
Accrued vacation | 24,227 | 22,174
Deferred compensation | 40,742 | 33,382
Other | 10,395 | 12,008
Total deferred tax assets | 119,971 | 110,870
Depreciation | (376,034) | (334,379)
Unrecognized revenue | (11,465) | (10,062)
Other | (2,334) | (1,483)
Deferred Tax Liabilities, Gross | 389,833 | 345,924
Total deferred tax liabilities | $ (269,862) | $ (235,054)

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