GOODWILL AND INTANGIBLE ASSETS - Schedule of carrying amount of intangible assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 443,492	$ 410,365
Accumulated Amortization	(291,439)	(231,037)
Total	152,053	179,328
Amortization expense of intangible assets	60,400	63,900	$ 61,300
Licensed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	82,673	49,546
Accumulated Amortization	(44,950)	(30,062)
Total	37,723	19,484
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	285,443	285,443
Accumulated Amortization	(203,376)	(164,406)
Total	82,067	121,037
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	69,776	69,776
Accumulated Amortization	(37,513)	(31,246)
Total	32,263	38,530
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	5,600	5,600
Accumulated Amortization	(5,600)	(5,323)
Total	$ 0	$ 277
Finite-lived intangible asset, useful life	3 years	3 years
Minimum | Licensed technology
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	1 year	1 year
Minimum | Developed technology
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	4 years	4 years
Minimum | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	4 years	4 years
Maximum | Licensed technology
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	9 years	8 years
Maximum | Developed technology
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	7 years	7 years
Maximum | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	9 years	9 years