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Fair Value Measurements (Changes in Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Derivatives Fair Value [Line Items]      
Net change in cash flow derivative hedges-net of tax [1] $ (1,824) $ (331) $ (828)
Total other comprehensive income (loss) (1,824) (331) (828)
Fuel Hedge Contracts [Member]      
Derivatives Fair Value [Line Items]      
Reclassification of derivative (gains) losses to earnings—net of tax (861) (10,629) (6,481)
Change in fair value of derivatives—net of tax (2,565) 9,681 5,653
Net change in cash flow derivative hedges-net of tax (1,704) (948) (828)
Foreign Currency Exchange Hedge Contracts [Member]      
Derivatives Fair Value [Line Items]      
Reclassification of derivative (gains) losses to earnings—net of tax (400) 116  
Change in fair value of derivatives—net of tax 280 501  
Net change in cash flow derivative hedges-net of tax (120) 617  
Total other comprehensive income (loss) $ (1,824) $ (331) $ (828)
[1] Net of income tax benefit of $616, $112 and $280 for the years ended December 31, 2023, 2022 and 2021, respectively.