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INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]      
Amortization of Finite-Lived Intangible Assets $ 2,300 $ 6,900  
Amortizing Identifiable Intangible Assets [Abstract]      
Gross 119,545 119,545 $ 119,812
Accumulated Amortization (112,800) (112,800) (106,130)
Net 6,745 6,745 13,682
Future expected amortization expense, identifiable intangible assets      
2017 2,300 2,300  
2018 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 58,425 58,425 58,609
Accumulated Amortization (52,738) (52,738) (47,072)
Net 5,687 5,687 11,537
Customer Relationships [Member]      
Amortizing Identifiable Intangible Assets [Abstract]      
Gross 54,863 54,863 54,946
Accumulated Amortization (53,805) (53,805) (52,801)
Net 1,058 1,058 2,145
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