INTANGIBLE ASSETS (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Amortization of Finite-Lived Intangible Assets	$ 1,800,000	$ 4,900,000	$ 7,700,000
Amortizing Identifiable Intangible Assets [Abstract]
Gross	112,145,000	114,258,000
Accumulated Amortization	(109,700,000)	(109,998,000)
Net	2,445,000	4,260,000
Future expected amortization expense, identifiable intangible assets
2015	1,500,000
2016	900,000
Completed technologies and patents [Member]
Amortizing Identifiable Intangible Assets [Abstract]
Gross	51,950,000	52,711,000
Accumulated Amortization	(51,950,000)	(52,659,000)
Net	0	52,000
Customer relationships [Member]
Amortizing Identifiable Intangible Assets [Abstract]
Gross	49,216,000	49,627,000
Accumulated Amortization	(46,771,000)	(45,557,000)
Net	2,445,000	4,070,000
Trade names [Member]
Amortizing Identifiable Intangible Assets [Abstract]
Gross	5,936,000	5,976,000
Accumulated Amortization	(5,936,000)	(5,976,000)
Net	0	0
Capitalized software costs [Member]
Amortizing Identifiable Intangible Assets [Abstract]
Gross	5,043,000	5,944,000
Accumulated Amortization	(5,043,000)	(5,806,000)
Net	$ 0	$ 138,000