XML 36 R40.htm IDEA: XBRL DOCUMENT v2.4.0.8
Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
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)