INTANGIBLE ASSETS AND GOODWILL (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Net Assets	$ (268,600)
Amortization of Finite-Lived Intangible Assets	9,300	$ 10,300	$ 6,400
Amortizing Identifiable Intangible Assets [Abstract]
Gross	119,812	118,848
Accumulated Amortization	(106,130)	(95,916)
Net	13,682	22,932
Goodwill and intangible assets impairments [Abstract]
Goodwill	32,643	32,643
Future expected amortization expense, identifiable intangible assets
2017	9,300
2018	4,300
Completed technologies and patents [Member]
Amortizing Identifiable Intangible Assets [Abstract]
Gross	58,609	57,994
Accumulated Amortization	(47,072)	(38,657)
Net	11,537	19,337
Customer relationships [Member]
Amortizing Identifiable Intangible Assets [Abstract]
Gross	54,946	54,597
Accumulated Amortization	(52,801)	(51,002)
Net	2,145	3,595
Trade names [Member]
Amortizing Identifiable Intangible Assets [Abstract]
Gross	1,346	1,346
Accumulated Amortization	(1,346)	(1,346)
Net	0	0
Capitalized software costs [Member]
Amortizing Identifiable Intangible Assets [Abstract]
Gross	4,911	4,911
Accumulated Amortization	(4,911)	(4,911)
Net	$ 0	$ 0