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, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]    
Claims and insurance reserves $ 32,499,000 $ 30,003,000
Allowance for doubtful accounts 2,829,000 2,827,000
Accrued vacation 12,399,000 9,339,000
Deferred compensation 17,734,000 14,441,000
Other 9,764,000 5,992,000
Total deferred tax assets 75,225,000 62,602,000
Valuation allowance (559,000) 0
Net deferred tax assets 74,666,000 62,602,000
Depreciation (197,875,000) (169,309,000)
Unrecognized revenue (8,171,000) (6,995,000)
Other (1,752,000) (1,748,000)
Total deferred tax liabilities (207,798,000) (178,052,000)
Net deferred tax liability $ (133,132,000) $ (115,450,000)