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Related Party Transactions (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 26, 2016 | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Aug. 31, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Rent expense |  |  |  |  |  | $ 18,700 | $ 19,100 | $ 19,600
Net book value associated with building |  | $ 469,646 |  |  |  | $ 469,646 | 567,024 | 624,959
Gain on sale of asset |  |  | $ 600 |  | $ 1,300 |  |  |
Buildings and improvements |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  | 39 years |  |
Affiliated Entity |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Lessee, operating lease, renewal term |  |  |  |  |  | 36 months |  |
Rent expense |  |  |  |  |  | $ 6,900 | 8,000 | 7,600
Affiliated Entity | Buildings and improvements |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Net book value associated with building |  | 59,600 |  |  |  | $ 59,600 |  |
Estimated useful life |  |  |  |  |  | 38 years |  |
Affiliated Entity | Leasehold improvements |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Net book value associated with building |  | 17,800 |  |  |  | $ 17,800 |  |
Estimated useful life |  |  |  |  |  | 12 years |  |
Affiliated Entity | Western Airways, Inc. |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Net charter expense |  |  |  |  |  | $ 1,100 | 1,300 | $ 2,000
Commissions paid |  |  |  | $ 200 |  |  |  |
Affiliated Entity | Western Airways, Inc. | Flight Equipment |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Gain on sale of asset |  | $ 700 |  |  |  |  |  |
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% |  |  |  | 85.00% |  |
Percentage retained under tax receivable agreement (percent) |  |  |  |  |  | 15.00% |  |
Tax receivable agreement, liability |  | $ 2,100 |  |  |  | $ 2,100 | $ 124,600 |
Cumulative loss period |  |  |  |  |  | 36 months |  |
Estimated termination payment |  | $ 60,700 |  |  |  | $ 60,700 |  |
Tax receivable agreement liability, discount rate (percent) |  | 5.58% |  |  |  | 5.58% |  |

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