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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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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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