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INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]          
Amortization of Finite-Lived Intangible Assets $ 2,300 $ 2,700 $ 4,600 $ 5,500  
Amortizing Identifiable Intangible Assets [Abstract]          
Gross 119,415   119,415   $ 118,848
Accumulated Amortization (101,108)   (101,108)   (95,916)
Net 18,307   18,307   22,932
Future expected amortization expense, identifiable intangible assets          
2017 4,600   4,600    
2018 9,300   9,300    
2019 4,400   4,400    
Carrying value of Goodwill [Abstract]          
Goodwill 32,643   32,643   32,643
Completed Technologies and Patents [Member]          
Amortizing Identifiable Intangible Assets [Abstract]          
Gross 58,353   58,353   57,994
Accumulated Amortization (42,916)   (42,916)   (38,657)
Net 15,437   15,437   19,337
Customer Relationships [Member]          
Amortizing Identifiable Intangible Assets [Abstract]          
Gross 54,805   54,805   54,597
Accumulated Amortization (51,935)   (51,935)   (51,002)
Net 2,870   2,870   3,595
Trade Names [Member]          
Amortizing Identifiable Intangible Assets [Abstract]          
Gross 1,346   1,346   1,346
Accumulated Amortization (1,346)   (1,346)   (1,346)
Net 0   0   0
Capitalized Software Costs [Member]          
Amortizing Identifiable Intangible Assets [Abstract]          
Gross 4,911   4,911   4,911
Accumulated Amortization (4,911)   (4,911)   (4,911)
Net $ 0   $ 0   $ 0