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Acquisitions and Divestitures - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions |  |  | 3 Months Ended | 12 Months Ended |
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Dec. 18, 2018 | Nov. 01, 2016 | Sep. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 211,040 |  |  | $ 211,040 | $ 211,040 |  |
Proceeds from sale of assets and equipment |  |  |  |  |  |  |  | 7,089 | $ 14,030 | $ 3,858 |
Proceeds from sale of aircraft |  |  |  |  |  | $ 4,900 | $ 1,300 |  |  |  |
Gain on sale of asset |  |  |  |  | 300 | 600 | $ 1,300 |  |  |  |
Proceeds from sale of building |  |  |  |  | 2,400 | 2,700 |  |  |  |  |
Affiliated Entity |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of aircraft |  |  |  |  | 700 |  |  |  |  |  |
Flight Equipment | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on sale of asset |  |  |  |  | $ 700 |  |  |  |  |  |
Blackhawk |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 192,400 |  |  |  |  |  | 192,400 |  |  |
International Services | Buildings and improvements |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of assets and equipment |  |  | $ 2,600 | $ 800 |  |  |  |  |  |  |
Assets Held-for-sale, Not Part of Disposal Group, Other |  |  | 300 |  |  |  |  |  |  |  |
Assets held-for-sale, net book value |  |  | $ 5,000 |  |  | $ 4,100 |  | 4,200 |  |  |
Blackhawk |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash payments to acquire business |  | $ 150,400 |  |  |  |  |  |  |  |  |
Share consideration to acquire business (in shares) |  | 12.8 |  |  |  |  |  |  |  |  |
Total consideration transferred |  | $ 294,600 |  |  |  |  |  |  |  |  |
Closing share price (USD per share) |  |  |  |  |  |  |  |  |  |  | $ 11.25
Revenues |  |  |  |  |  |  |  |  |  | 10,000 |
Operating losses |  |  |  |  |  |  |  |  |  | $ (7,400) |
Real Property Acquisition From Mosing Companies | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase from related party | $ 37,000 |  |  |  |  |  |  |  |  |  |
Real Property Acquisition From Mosing Companies | Buildings and improvements | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase from related party |  |  |  |  |  |  |  | $ 18,500 |  |  |

X
- Definition Amount of assets held-for-sale that are not part of a disposal group. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 15 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=77912953&loc=d3e400-110220 + Details
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