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ACQUISITIONS - Additional Information (Details) - USD ($) $ in Thousands			6 Months Ended
	May 22, 2019	Feb. 28, 2019	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Total purchase consideration net of cash acquired			$ 58,379	$ 1,315
Goodwill recorded in acquisition			$ 32,407
Dema Service
Business Acquisition [Line Items]
Total purchase consideration net of cash acquired	$ 14,200
Goodwill recorded in acquisition	$ 7,800
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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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

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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=118932676&loc=d3e3213-108585

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