Annual report pursuant to Section 13 and 15(d)

Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details)

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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
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)