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Acquisition and Divestitures - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions		1 Months Ended				12 Months Ended
	Nov. 01, 2016	Dec. 31, 2017	Sep. 30, 2017	Aug. 31, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Oct. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 211,040				$ 211,040	$ 211,063
Proceeds from sale of aircraft				$ 4,900	$ 1,300
Gain on sale of asset			$ 600		$ 1,300
Proceeds from sale of building		2,400	$ 2,700
Affiliated Entity | Western Airways, Inc.
Business Acquisition [Line Items]
Proceeds from sale of aircraft		700
Building
Business Acquisition [Line Items]
Gain on sale of asset		300
Flight Equipment | Affiliated Entity | Western Airways, Inc.
Business Acquisition [Line Items]
Gain on sale of asset		700
Blackhawk
Business Acquisition [Line Items]
Goodwill	$ 192,400	192,400				192,400
Blackhawk
Business Acquisition [Line Items]
Cash payments to acquire business	$ 150,400
Number of shares (in shares)	12.8
Total consideration transferred	$ 294,563					294,563
Closing share price (USD per share)								$ 11.25
Revenues							10,000
Operating losses							$ 7,400
Goodwill	$ 192,409	$ 192,386				$ 192,386

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Number of shares of equity interests issued or issuable to acquire entity.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 50
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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 impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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