Annual report pursuant to Section 13 and 15(d)

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

v3.6.0.2
Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]    
Claims and insurance reserves $ 43,409 $ 41,576
Allowance for doubtful accounts 1,198 1,730
Accrued vacation 24,227 22,174
Deferred compensation 40,742 33,382
Other 10,395 12,008
Total deferred tax assets 119,971 110,870
Depreciation (376,034) (334,379)
Unrecognized revenue (11,465) (10,062)
Other (2,334) (1,483)
Deferred Tax Liabilities, Gross 389,833 345,924
Total deferred tax liabilities $ (269,862) $ (235,054)