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v3.19.3.a.u2

Commitments and Contingencies (Details) | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) employee | Dec. 31, 2018 USD ($) | Dec. 31, 2017
Concentration Risk and Significant Customers |  |  |
Accrued workers' compensation liability | $ | $ 23,900,000 | $ 42,000,000.0 |
Allowance for doubtful accounts | $ | $ 18,000 | $ 158,000 |
Revenue from rights, concentration risk | Customer concentration risk | Delta, United, and Continental Combined |  |  |
Concentration Risk and Significant Customers |  |  |
Concentration risk (as a percent) | 77.60% | 81.40% | 82.90%
Full-time equivalent number of employees | Labor force concentration risk |  |  |
Concentration Risk and Significant Customers |  |  |
Number of employees | employee | 13,700 |  |
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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