INTANGIBLE ASSETS (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Amortization of Finite-Lived Intangible Assets	$ 4,900,000	$ 7,700,000	$ 12,400,000
Amortizing Identifiable Intangible Assets [Abstract]
Gross	114,258,000	114,171,000
Accumulated Amortization	(109,998,000)	(104,954,000)
Net	4,260,000	9,217,000
Future expected amortization expense, identifiable intangible assets
2011	2,000,000
2012	2,000,000
2013	1,000,000
Completed Technologies and Patents [Member]
Amortizing Identifiable Intangible Assets [Abstract]
Gross	52,711,000	52,720,000
Accumulated Amortization	(52,659,000)	(51,171,000)
Net	52,000	1,549,000
Customer Relationships [Member]
Amortizing Identifiable Intangible Assets [Abstract]
Gross	49,627,000	49,543,000
Accumulated Amortization	(45,557,000)	(42,828,000)
Net	4,070,000	6,715,000
Trade Names [Member]
Amortizing Identifiable Intangible Assets [Abstract]
Gross	5,976,000	5,970,000
Accumulated Amortization	(5,976,000)	(5,970,000)
Net	0	0
Software and Software Development Costs [Member]
Amortizing Identifiable Intangible Assets [Abstract]
Gross	5,944,000	5,938,000
Accumulated Amortization	(5,806,000)	(4,985,000)
Net	$ 138,000	$ 953,000