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Related Party Transactions (Details) $ in Thousands		1 Months Ended	3 Months Ended
	Aug. 26, 2016	Mar. 31, 2017 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Related Party Transaction [Line Items]
Net book value associated with buildings			$ 449,153		$ 469,646
Conversion ratio, preferred stock to common stock	1
Percentage retained under tax receivable agreement	15.00%
Estimated termination payment			$ 54,600
Discount rate, tax receivable agreement liability			5.85%
Buildings and improvements
Related Party Transaction [Line Items]
Estimated remaining useful life			39 years
Affiliated Entity
Related Party Transaction [Line Items]
Lessee, operating lease, renewal term			36 months
Rent expense			$ 2,200	$ 1,800
Affiliated Entity | Western Airways
Related Party Transaction [Line Items]
Proceeds from sale of aircraft		$ 1,300
Gain on sale of asset		$ 1,300
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			$ 5,100
Affiliated Entity | Buildings and improvements
Related Party Transaction [Line Items]
Net book value associated with buildings			$ 58,800
Estimated remaining useful life			38 years
Affiliated Entity | Leasehold improvements and land improvements
Related Party Transaction [Line Items]
Net book value associated with buildings			$ 18,000
Estimated remaining useful life			10 years

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