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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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