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Fair Value Measurements (Changes in Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Derivatives Fair Value [Line Items]        
Net change in cash flow derivative hedges—net of tax [1] $ (150) $ 50 $ 212 $ 1,338
Fuel Hedge Contracts [Member]        
Derivatives Fair Value [Line Items]        
Reclassification of derivative losses (gains) to earnings - net of tax 522 359 642 238
Change in fair value of derivatives—net of tax (637) (310) (186) 1,700
Net change in cash flow derivative hedges—net of tax (115) 49 456 1,938
Foreign Currency Exchange Hedge Contracts [Member]        
Derivatives Fair Value [Line Items]        
Reclassification of derivative losses (gains) to earnings - net of tax   6   42
Change in fair value of derivatives—net of tax   (5)   (642)
Net change in cash flow derivative hedges—net of tax   $ 1   $ (600)
Interest Rate Swaps [Member]        
Derivatives Fair Value [Line Items]        
Reclassification of derivative losses (gains) to earnings - net of tax (64)   (132)  
Change in fair value of derivatives—net of tax 29   (112)  
Net change in cash flow derivative hedges—net of tax $ (35)   $ (244)  
[1] Net of income tax benefit (provision) of $52 and $(17) for the three months ended June 30, 2025 and 2024, respectively.
Net of income tax provision of $(71) and $(453) for the six months ended June 30, 2025 and 2024, respectively.