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Related Party Transactions (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Aug. 26, 2016 | Aug. 31, 2017 USD ($) | Mar. 31, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Conversion ratio, preferred stock to common stock | 1 |  |  |  |  |  |
Percentage retained under tax receivable agreement | 15.00% |  |  |  |  |  |
Estimated termination payment |  |  |  | $ 55.7 |  | $ 55.7 |
Discount rate, tax receivable agreement liability |  |  |  | 6.13% |  | 6.13% |
Affiliated Entity |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Rent expense |  |  |  | $ 1.1 | $ 1.8 | $ 5.0 | $ 5.3
Affiliated Entity | Western Airways |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Net charter expense |  |  |  |  | $ 0.4 |  | $ 1.0
Proceeds from sale of aircraft |  | $ 4.9 | $ 1.3 |  |  |  |
Gain on sale of asset |  |  | $ 1.3 |  |  |  |
Affiliated Entity | Mosing Holdings |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Percentage of tax benefits realized payable | 85.00% |  |  |  |  |  |
Cumulative deficit, period |  |  |  |  |  | 36 months |
Tax receivable agreement, estimated liability |  |  |  | $ 7.4 |  | $ 7.4 |

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