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

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Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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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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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Cash received from sales of long-lived depreciable flight assets, including owned aircraft or capital improvements.

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Acquisition and Divestiture - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions			6 Months Ended
	Mar. 15, 2017	Nov. 01, 2016	Jun. 30, 2017	Oct. 31, 2016
Business Acquisition [Line Items]
Proceeds from sale of aircraft	$ 1,300
Gain on sale of asset	$ 1,300
Blackhawk
Business Acquisition [Line Items]
Goodwill		$ 192,400
Blackhawk
Business Acquisition [Line Items]
Cash payments to acquire business		$ 150,400
Shares of common stock to acquire business		12.8
Total consideration to acquire business		$ 294,563	$ 294,563
Closing share price (in dollars per share)				$ 11.25
Goodwill		$ 192,409	$ 192,386