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Related Party Transactions (Details) $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 18, 2018 USD ($) | Aug. 26, 2016 | Aug. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Rent expense |  |  |  |  |  |  |  | $ 16.8 | $ 18.7 | $ 19.1
Proceeds from sale of aircraft |  |  |  |  |  | $ 4.9 | $ 1.3 |  |  |
Estimated termination payment |  |  |  |  |  |  |  | $ 44.6 |  |
Tax receivable agreement liability, discount rate (percent) |  |  |  |  |  |  |  | 5.87% |  |
Affiliated Entity |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Rent expense |  |  |  |  |  |  |  | $ 6.5 | 6.9 | 8.0
Proceeds from sale of aircraft |  |  |  |  | $ 0.7 |  |  |  |  |
Affiliated Entity | Western Airways, Inc. |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Net charter expense |  |  |  |  |  |  |  |  | $ 1.1 | $ 1.3
Commissions paid |  |  | $ 0.2 |  |  |  |  |  |  |
Affiliated Entity | Mosing Aviation, LLC |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of aircraft |  |  |  | $ 0.7 |  |  |  |  |  |
Affiliated Entity | Mosing Holdings |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion ratio, preferred stock to common stock (percent) |  | 1 |  |  |  |  |  |  |  |
Tax benefits realized payable (percent) |  |  |  |  |  |  |  | 85.00% |  |
Percentage retained under tax receivable agreement (percent) |  |  |  |  |  |  |  | 15.00% |  |
Cumulative loss period |  |  |  |  |  |  |  | 36 months |  |
Tax receivable agreement, liability |  |  |  |  |  |  |  | $ 0.2 |  |
Real Property Acquisition From Mosing Companies | Affiliated Entity |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase from related party | $ 37.0 |  |  |  |  |  |  |  |  |
Term for certain rights and obligations within agreement | 10 years |  |  |  |  |  |  |  |  |
Real Property Acquisition From Mosing Companies | Affiliated Entity | Buildings and improvements |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase from related party |  |  |  |  |  |  |  | $ 18.5 |  |

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