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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
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Income Tax Disclosure [Abstract] |  |
Claims and insurance reserves | $ 41,576,000 | $ 36,690,000
Allowance for doubtful accounts | 1,730,000 | 2,161,000
Accrued vacation | 22,174,000 | 19,291,000
Deferred compensation | 33,382,000 | 28,648,000
Other | 12,008,000 | 12,924,000
Total deferred tax assets | 110,870,000 | 99,714,000
Valuation allowance | 0 | (559,000)
Net deferred tax assets | 110,870,000 | 99,155,000
Depreciation | (334,379,000) | (279,324,000)
Unrecognized revenue | (10,062,000) | (9,506,000)
Other | (1,483,000) | (1,737,000)
Deferred Tax Liabilities, Gross | 345,924,000 | 290,567,000
Total deferred tax liabilities | $ (235,054,000) | $ (191,412,000)

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