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Commitments and Contingencies (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) employee aircraft | Dec. 31, 2020 USD ($) | Dec. 31, 2019
Concentration Risk and Significant Customers |  |  |
Accrued workers' compensation liability | $ | $ 17.5 | $ 20.7 |
Accrued workers' compensation liability, current | $ | $ 7.1 | $ 8.6 |
E175 [Member] |  |  |
Concentration Risk and Significant Customers |  |  |
Commitment to purchase number of aircraft | aircraft | 29 |  |
Revenue from rights, concentration risk | Customer Concentration Risk [Member] | Delta, United, and Continental Combined |  |  |
Concentration Risk and Significant Customers |  |  |
Concentration risk (as a percent) | 73.50% | 76.40% | 77.60%
Full-time equivalent number of employees | Labor Force Concentration Risk [Member] |  |  |
Concentration Risk and Significant Customers |  |  |
Number of employees | employee | 15,205 |  |
SkyWest Airlines [Member] | Full-time equivalent number of employees | Unionized employees |  |  |
Concentration Risk and Significant Customers |  |  |
Approximate number of active employees | employee | 0 |  |

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