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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Reclassification of derivative (gains) losses to earnings—net of tax $ (10,629)    
Net change in cash flow derivative hedges-net of tax [1] (331) $ (828) $ 673
Total other comprehensive income (loss) (331) (828) 673
Fuel Hedge Contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Reclassification of derivative (gains) losses to earnings—net of tax (10,629) (6,481) 5,825
Change in fair value of derivatives—net of tax 9,681 5,653 (5,152)
Net change in cash flow derivative hedges-net of tax (948) (828) 673
Foreign Currency Exchange Hedge Contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Reclassification of derivative (gains) losses to earnings—net of tax 116    
Change in fair value of derivatives—net of tax 501    
Net change in cash flow derivative hedges-net of tax 617    
Total other comprehensive income (loss) $ (331) $ (828) $ 673
[1] Net of income tax (provision) benefit of $112, $280 and $217 for the years ended December 31, 2022, 2021 and 2020, respectively.