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Fair Value Measurements (Changes in Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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.

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