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Fair Value Measurements (Adjustments Reclassified from Accumulated Balances Other Comprehensive Income (Loss) to Earnings) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Derivative Instruments Gain Loss [Line Items]        
Costs of contract revenues $ 138,947 $ 146,992 $ 300,241 $ 291,549
Income tax (provision) benefit 853 (829) (2,432) (2,218)
Net income (loss) 4,033 (2,105) (7,024) (10,919)
Fuel Hedge Contracts [Member] | Accumulated Gain Loss Net Cash Flow Hedge Parent [Member] | Reclassification Out of Accumulated Other Comprehensive Income [Member]        
Derivative Instruments Gain Loss [Line Items]        
Costs of contract revenues (6,313) (2,513) (9,632) (4,554)
Income tax (provision) benefit (1,594) (635) (2,432) (1,150)
Net income (loss) $ (4,719) $ (1,878) $ (7,200) $ (3,404)