Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Claims and insurance reserves $ 29,008 $ 43,409
Accrued vacation 17,832 24,227
Deferred compensation 29,220 40,742
Other 15,157 11,593
Total deferred tax assets 91,217 119,971
Depreciation (266,730) (376,034)
Unrecognized revenue (10,007) (11,465)
Other (1,703) (2,334)
Deferred Tax Liabilities, Gross 278,440 389,833
Total deferred tax liabilities $ (187,223) $ (269,862)