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INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]      
Amortization of Finite-Lived Intangible Assets $ 2,300 $ 2,700  
Amortizing Identifiable Intangible Assets [Abstract]      
Gross 118,947   $ 118,848
Accumulated Amortization (98,327)   (95,916)
Net 20,620   22,932
Future expected amortization expense, identifiable intangible assets      
2017 6,900    
2018 9,300    
2019 4,400    
Carrying value of Goodwill [Abstract]      
Goodwill 32,643   32,643
Completed Technologies and Patents [Member]      
Amortizing Identifiable Intangible Assets [Abstract]      
Gross 58,059   57,994
Accumulated Amortization (40,671)   (38,657)
Net 17,388   19,337
Customer Relationships [Member]      
Amortizing Identifiable Intangible Assets [Abstract]      
Gross 54,631   54,597
Accumulated Amortization (51,399)   (51,002)
Net 3,232   3,595
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