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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2025
Fair Value Disclosures [Abstract] |
Schedule of Fair Values of Financial Instruments and Nonfinancial Assets and Liabilities Measured at the Reporting Date | The fair values of these financial instruments are summarized as follows:
|  |  |  | Fair Value at |
|  | Fair Value |  |  |  |  |  |  |  |  |  |  |  |
|  | Hierarchy |  | June 30, 2025 |  |  | December 31, 2024 |
|  | Levels |  | Assets |  |  | Liabilities |  |  | Assets |  |  | Liabilities |
Derivatives designated as cash flow hedging instruments: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fuel hedge contracts |  | 2 |  | $ | — |  |  | $ | 454 |  |  | $ | — |  |  | $ | 1,065 |
Interest rate swaps |  | 2 |  |  | — |  |  |  | 109 |  |  |  | 217 |  |  |  | — |
Total derivatives |  |  |  | $ | — |  |  | $ | 563 |  |  | $ | 217 |  |  | $ | 1,065 |
Changes in Components of Accumulated Other Comprehensive Income (Loss) | Changes in the components of the accumulated balances of other comprehensive income (loss) are as follows:
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |
Fuel Hedge Contracts |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of derivative losses (gains) to earnings—net of tax |  | $ | 522 |  |  | $ | 359 |  |  | $ | 642 |  |  | $ | 238 |
Change in fair value of derivatives—net of tax |  |  | (637 | ) |  |  | (310 | ) |  |  | (186 | ) |  |  | 1,700 |
Net change in cash flow derivative fuel hedges—net of tax |  | $ | (115 | ) |  | $ | 49 |  |  | $ | 456 |  |  | $ | 1,938 |
Foreign Currency Exchange Hedge Contracts |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of derivative losses to earnings—net of tax |  | $ | — |  |  | $ | 6 |  |  | $ | — |  |  | $ | 42 |
Change in fair value of derivatives—net of tax |  |  | — |  |  |  | (5 | ) |  |  | — |  |  |  | (642 | )
Net change in cash flow derivative foreign currency hedges—net of tax |  | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | (600 | )
Interest Rate Swaps |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of derivative gains to earnings—net of tax |  | $ | (64 | ) |  | $ | — |  |  | $ | (132 | ) |  | $ | — |
Change in fair value of derivatives—net of tax |  |  | 29 |  |  |  | — |  |  |  | (112 | ) |  |  | — |
Net change in cash flow derivative foreign currency hedges—net of tax |  | $ | (35 | ) |  | $ | — |  |  | $ | (244 | ) |  | $ | — |
Total net change in cash flow derivative hedges - net of tax |  | $ | (150 | ) |  | $ | 50 |  |  | $ | 212 |  |  | $ | 1,338 |
Adjustments Reclassified from Accumulated Balances Other Comprehensive Income (Loss) to Earnings | Adjustments reclassified from accumulated balances of other comprehensive income (loss) to earnings are as follows:
|  |  |  | Three Months Ended |  |  | Six Months Ended |
|  |  |  | June 30, |  |  | June 30, |
|  | Statement of Operations Location |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fuel hedge contracts |  | Costs of contract revenues |  | $ | 698 |  |  | $ | 482 |  |  | $ | 859 |  |  | $ | 319 |
Foreign currency exchange hedge contracts |  | Other income (expense) |  |  | — |  |  |  | 7 |  |  |  | — |  |  |  | 56 |
Interest rate swaps |  | Interest expense—net |  |  | (86 | ) |  |  | — |  |  |  | (177 | ) |  |  | — |
|  | Income tax benefit |  |  | 154 |  |  |  | 124 |  |  |  | 172 |  |  |  | 95 |
|  |  |  | $ | 458 |  |  | $ | 365 |  |  | $ | 510 |  |  | $ | 280 |

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