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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Derivatives Fair Value [Line Items]        
Reclassification of derivative (gains) losses to earnings net of tax     $ (7,200)  
Net change in cash flow derivative hedges—net of tax [1] $ (376) $ 404 5,859 $ 2,290
Fuel Hedge Contracts [Member]        
Derivatives Fair Value [Line Items]        
Reclassification of derivative (gains) losses to earnings net of tax (4,719) (1,878) (7,200) (3,404)
Change in fair value of derivatives—net of tax 4,584 2,282 13,300 5,694
Net change in cash flow derivative hedges—net of tax (135) $ 404 6,100 $ 2,290
Foreign Currency Exchange Hedge Contracts [Member]        
Derivatives Fair Value [Line Items]        
Reclassification of derivative (gains) losses to earnings net of tax     0  
Change in fair value of derivatives—net of tax (241)   (241)  
Net change in cash flow derivative foreign currency hedges—net of tax $ (241)   $ (241)  
[1] Net of income tax (provision) benefit of $127 and $(136) for the three months ended June 30, 2022 and 2021, respectively. Net of income tax provision of $(1,979) and $(773) for the six months ended June 30, 2022 and 2021, respectively.