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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
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Derivative Instruments Gain Loss [Line Items] |  |
Costs of contract revenues | $ 153,086 | $ 145,909
Other expense (income) | 425 | 227
Income tax (provision) benefit | (6,989) | 791
Net income (loss) | 21,024 | (3,231)
Accumulated Gain Loss Net Cash Flow Hedge Parent [Member] | Reclassification Out of Accumulated Other Comprehensive Income [Member] |  |
Derivative Instruments Gain Loss [Line Items] |  |
Income tax (provision) benefit | (29) | 112
Net income (loss) | (85) | 331
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 | (163) | 495
Foreign Currency Exchange 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] |  |
Other expense (income) | $ 49 | $ (52)

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