INTANGIBLE ASSETS (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Amortization of Finite-Lived Intangible Assets	$ 600,000	$ 1,400,000
Amortizing Identifiable Intangible Assets [Abstract]
Gross	114,142,000		114,258,000
Accumulated Amortization	(110,463,000)		(109,998,000)
Net	3,679,000		4,260,000
Future expected amortization expense, identifiable intangible assets
2011	1,200,000
2012	1,500,000
2013	1,000,000
Completed Technologies and Patents [Member]
Amortizing Identifiable Intangible Assets [Abstract]
Gross	52,615,000		52,711,000
Accumulated Amortization	(52,615,000)		(52,659,000)
Net	0		52,000
Customer Relationships [Member]
Amortizing Identifiable Intangible Assets [Abstract]
Gross	49,610,000		49,627,000
Accumulated Amortization	(46,020,000)		(45,557,000)
Net	3,590,000		4,070,000
Trade Names [Member]
Amortizing Identifiable Intangible Assets [Abstract]
Gross	5,973,000		5,976,000
Accumulated Amortization	(5,973,000)		(5,976,000)
Net	0		0
Software and Software Development Costs [Member]
Amortizing Identifiable Intangible Assets [Abstract]
Gross	5,944,000		5,944,000
Accumulated Amortization	(5,855,000)		(5,806,000)
Net	$ 89,000		$ 138,000