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Fair Value Measurements (Adjustments Reclassified From Accumulated Balances Other Comprehensive Income (Loss) To Earnings) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative Instruments Gain Loss [Line Items]      
Costs of contract revenues $ (681,197) $ (760,955) $ (714,335)
Income tax (provision) benefit 5,792 2,497 11,530
Net income (loss) 8,177 $ 6,189 (10,295)
Fuel Hedge Contracts [Member] | Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges | Reclassification Out Of Accumulated Other Comprehensive Income      
Derivative Instruments Gain Loss [Line Items]      
Costs of contract revenues 50   (286)
Income tax (provision) benefit 20   (46)
Net income (loss) $ 30   $ (332)