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Related Party Transactions (Details) $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 26, 2016	Mar. 31, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Related Party Transaction [Line Items]
Property, Plant and Equipment, Net			$ 422,034		$ 422,034		$ 469,646
Conversion ratio, preferred stock to common stock	1
Percentage retained under tax receivable agreement	15.00%
Estimated termination payment			$ 55,100		$ 55,100
Discount rate, tax receivable agreement liability			5.91%		5.91%
Buildings and improvements
Related Party Transaction [Line Items]
Estimated remaining useful life					39 years
Affiliated Entity
Related Party Transaction [Line Items]
Rent expense			$ 1,700	$ 1,700	$ 3,900	$ 3,500
Affiliated Entity | Western Airways
Related Party Transaction [Line Items]
Net charter expense				$ 700		$ 600
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			6,200		$ 6,200
Affiliated Entity | Buildings and improvements
Related Party Transaction [Line Items]
Estimated remaining useful life					37 years
Property, Plant and Equipment, Net			58,400		$ 58,400
Affiliated Entity | Leasehold improvements and land improvements
Related Party Transaction [Line Items]
Estimated remaining useful life					10 years
Property, Plant and Equipment, Net			$ 17,600		$ 17,600

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