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Fair Value Measurements (Changes in Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Derivatives Fair Value [Line Items]        
Net change in cash flow derivative hedges—net of tax [1] $ 2,155 $ (7,222) $ 1,724 $ (1,363)
Fuel Hedge Contracts [Member]        
Derivatives Fair Value [Line Items]        
Reclassification of derivative (gains) losses to earnings - net of tax (297) (2,358) 1,507 (9,558)
Change in fair value of derivatives—net of tax 3,271 (3,590) 1,113 9,228
Net change in cash flow derivative hedges—net of tax 2,974 (5,948) 2,620 (330)
Foreign Currency Exchange Hedge Contracts [Member]        
Derivatives Fair Value [Line Items]        
Reclassification of derivative (gains) losses to earnings - net of tax (198) (196) (519) (196)
Change in fair value of derivatives—net of tax (621) (1,078) (377) (837)
Net change in cash flow derivative hedges—net of tax $ (819) $ (1,274) $ (896) $ (1,033)
[1] Net of income tax (provision) benefit of $(728) and $2,176 for the three months ended September 30, 2023 and 2022, respectively. Net of income tax (provision) benefit of $(583) and $197 for the nine months ended September 30, 2023 and 2022, respectively.