GOODWILL AND INTANGIBLE ASSETS - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Intangible Assets
Gross	$ 636,307
Accumulated Amortization	(153,266)	$ (100,964)
Net	483,041	535,343
Intangible assets, gross		636,307
Intangible assets, net		535,343
Technology
Intangible Assets
Gross	116,177	116,177
Accumulated Amortization	(38,597)	(28,882)
Net	$ 77,580	$ 87,295
Weighted Average Remaining Useful Life (years)	11 years	11 years 8 months 12 days
Trademarks and trade names
Intangible Assets
Gross	$ 31,860	$ 31,860
Accumulated Amortization	(9,363)	(6,415)
Net	$ 22,497	$ 25,445
Weighted Average Remaining Useful Life (years)	13 years	13 years 4 months 24 days
Database
Intangible Assets
Gross	$ 6,500	$ 6,500
Accumulated Amortization	(6,500)	(6,012)
Net	$ 0	$ 488
Weighted Average Remaining Useful Life (years)	0 months	21 days
Customer Relationships
Intangible Assets
Gross	$ 480,950	$ 480,950
Accumulated Amortization	(97,986)	(58,835)
Net	$ 382,964	$ 422,115
Weighted Average Remaining Useful Life (years)	10 years 7 months 6 days	11 years 7 months 6 days
Non-compete agreements
Intangible Assets
Gross	$ 820	$ 820
Accumulated Amortization	(820)	(820)
Net	$ 0	$ 0
Weighted Average Remaining Useful Life (years)	0 months	0 months
In-Process R&D
Intangible Assets
Net	$ 1,600
Weighted Average Remaining Useful Life (years)	5 years

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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