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INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]      
Amortization of Finite-Lived Intangible Assets $ 2,300 $ 2,300  
Amortizing Identifiable Intangible Assets [Abstract]      
Gross 119,908   $ 119,812
Accumulated Amortization (108,538)   (106,130)
Net 11,370   13,682
Future expected amortization expense, identifiable intangible assets      
2017 6,900    
2018 4,400    
Carrying value of Goodwill [Abstract]      
Goodwill 32,643   32,643
Completed Technologies and Patents [Member]      
Amortizing Identifiable Intangible Assets [Abstract]      
Gross 58,648   58,609
Accumulated Amortization (49,061)   (47,072)
Net 9,587   11,537
Customer Relationships [Member]      
Amortizing Identifiable Intangible Assets [Abstract]      
Gross 55,003   54,946
Accumulated Amortization (53,220)   (52,801)
Net 1,783   2,145
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