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Commitments and Contingencies (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) employee aircraft | Dec. 31, 2022 USD ($) | Dec. 31, 2021
Concentration Risk and Significant Customers |  |  |
Accrued workers' compensation liability | $ | $ 20.6 | $ 21.6 |
Accrued workers' compensation liability, current | $ | $ 7.3 | $ 8.0 |
E175 |  |  |
Concentration Risk and Significant Customers |  |  |
Commitment to purchase number of aircraft, 2024 | 5 |  |
Commitment to purchase number of aircraft, 2025 | 8 |  |
Commitment to purchase number of aircraft, 2026 | 8 |  |
Revenue from rights, concentration risk | Customer Concentration Risk | Delta, United, and Continental Combined |  |  |
Concentration Risk and Significant Customers |  |  |
Concentration risk (as a percent) | 70.90% | 72.50% | 73.50%
Full-time equivalent number of employees | Labor Force Concentration Risk |  |  |
Concentration Risk and Significant Customers |  |  |
Number of employees | employee | 13,000 |  |
SkyWest Airlines | Full-time equivalent number of employees | Unionized employees |  |  |
Concentration Risk and Significant Customers |  |  |
Approximate number of active employees | employee | 0 |  |

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