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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2023
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 Levels |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  | September 30, 2023 |  |  | December 31, 2022 |
|  |  |  | Assets |  |  | Liabilities |  |  | Assets |  |  | Liabilities |
Derivatives designated as cash flow hedging instruments: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fuel hedge contracts |  | 2 |  | $ | 2,868 |  |  | $ | — |  |  | $ | — |  |  | $ | 638 |
Foreign currency exchange hedge contracts |  | 2 |  |  | — |  |  |  | 374 |  |  |  | 831 |  |  |  | 6 |
Total derivatives |  |  |  | $ | 2,868 |  |  | $ | 374 |  |  | $ | 831 |  |  | $ | 644 |
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 |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |
Fuel Hedge Contracts |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of derivative (gains) losses to earnings—net of tax |  |  | (297 | ) |  |  | (2,358 | ) |  |  | 1,507 |  |  | $ | (9,558 | )
Change in fair value of derivatives—net of tax |  |  | 3,271 |  |  |  | (3,590 | ) |  |  | 1,113 |  |  |  | 9,228 |
Net change in cash flow derivative fuel hedges—net of tax |  | $ | 2,974 |  |  | $ | (5,948 | ) |  | $ | 2,620 |  |  | $ | (330 | )
Foreign Currency Exchange Hedge Contracts |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of derivative gains to earnings—net of tax |  | $ | (198 | ) |  | $ | (196 | ) |  | $ | (519 | ) |  | $ | (196 | )
Change in fair value of derivatives—net of tax |  |  | (621 | ) |  |  | (1,078 | ) |  |  | (377 | ) |  |  | (837 | )
Net change in cash flow derivative foreign currency hedges—net of tax |  | $ | (819 | ) |  | $ | (1,274 | ) |  | $ | (896 | ) |  | $ | (1,033 | )
Total net change in cash flow derivative hedges - net of tax |  | $ | 2,155 |  |  | $ | (7,222 | ) |  | $ | 1,724 |  |  | $ | (1,363 | )
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 |  |  | Nine Months Ended |
|  |  |  | September 30, |  |  | September 30, |
|  | Statement of Operations Location |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fuel hedge contracts |  | Costs of contract revenues |  | $ | (649 | ) |  | $ | (3,154 | ) |  | $ | 1,425 |  |  | $ | (12,786 | )
Foreign currency exchange hedge contracts |  | Other income (expense) |  | $ | (13 | ) |  | $ | — |  |  |  | (437 | ) |  |  | — |
|  | Income tax provision |  |  | (167 | ) |  |  | (600 | ) |  |  | — |  |  |  | (3,032 | )
|  |  |  | $ | (495 | ) |  | $ | (2,554 | ) |  | $ | 988 |  |  | $ | (9,754 | )

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