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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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Derivatives Fair Value [Line Items]        
Net change in cash flow derivative hedges—net of tax [1] $ 978 $ (376) $ (431) $ 5,859
Fuel Hedge Contracts [Member]        
Derivatives Fair Value [Line Items]        
Reclassification of derivative (gains) losses to earnings - net of tax 1,434 (4,719) 1,804 (7,200)
Change in fair value of derivatives—net of tax (252) 4,584 (2,158) 13,300
Net change in cash flow derivative hedges—net of tax 1,182 (135) (354) 6,100
Foreign Currency Exchange Hedge Contracts [Member]        
Derivatives Fair Value [Line Items]        
Reclassification of derivative (gains) losses to earnings - net of tax (279) (241) (321)  
Change in fair value of derivatives—net of tax 75   244 (241)
Net change in cash flow derivative hedges—net of tax $ (204) $ (241) $ 77 $ (241)
[1] Net of income tax (provision) benefit of $(331) and $127 for the three months ended June 30, 2023 and 2022, respectively. Net of income tax (provision) benefit of $145 and $(1,979) for the six months ended June 30, 2023 and 2022, respectively.