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ACQUISITIONS - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended
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Feb. 28, 2019 | Mar. 31, 2019 | Mar. 31, 2018
Business Acquisition [Line Items] |  |  |
Total purchase consideration. net of cash acquired |  | $ 44,143 | $ 0
Goodwill recorded in acquisition |  | $ 24,636 |
Space Cargo |  |  |
Business Acquisition [Line Items] |  |  |
Total purchase consideration. net of cash acquired | $ 44,100 |  |
Goodwill recorded in acquisition | $ 24,600 |  |

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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