GOODWILL AND INTANGIBLE ASSETS - Goodwill Summary (Details) $ in Thousands	6 Months Ended
Jun. 30, 2020 USD ($)
Goodwill [Roll Forward]
Balance at December 31, 2019	$ 475,025
Foreign currency translation adjustments	(545)
Balance at June 30, 2020	474,480
FMS
Goodwill [Roll Forward]
Balance at December 31, 2019	243,702
Foreign currency translation adjustments	(256)
Balance at June 30, 2020	243,446
SCS
Goodwill [Roll Forward]
Balance at December 31, 2019	190,515
Foreign currency translation adjustments	(289)
Balance at June 30, 2020	190,226
DTS
Goodwill [Roll Forward]
Balance at December 31, 2019	40,808
Foreign currency translation adjustments	0
Balance at June 30, 2020	$ 40,808

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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 (f)
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

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- Definition

Amount before 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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