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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Income Tax Disclosure [Abstract] |  |
Claims and insurance reserves | $ 35,200 | $ 32,499
Allowance for doubtful accounts | 1,595 | 2,829
Accrued vacation | 14,873 | 12,399
Deferred compensation | 22,067 | 17,734
Other | 10,648 | 9,764
Total deferred tax assets | 84,383 | 75,225
Valuation allowance | (460) | (559)
Net deferred tax assets | 83,923 | 74,666
Depreciation | (239,971) | (197,875)
Unrecognized revenue | (8,169) | (8,171)
Other | (1,651) | (1,752)
Total deferred tax liabilities | (249,791) | (207,798)
Net deferred tax liability | $ (165,868) | $ (133,132)

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