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INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]      
Amortization of Finite-Lived Intangible Assets $ 2,300    
Amortizing Identifiable Intangible Assets [Abstract]      
Gross   $ 119,416 $ 119,489
Accumulated Amortization   (117,296) (115,057)
Net   2,120 4,432
Future expected amortization expense, identifiable intangible assets      
2017   2,100  
Carrying value of Goodwill [Abstract]      
Goodwill   32,643 32,643
Completed Technologies and Patents [Member]      
Amortizing Identifiable Intangible Assets [Abstract]      
Gross   58,212 58,246
Accumulated Amortization   (56,424) (54,508)
Net   1,788 3,738
Customer Relationships [Member]      
Amortizing Identifiable Intangible Assets [Abstract]      
Gross   54,947 54,986
Accumulated Amortization   (54,615) (54,292)
Net   332 694
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