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BUSINESS ACQUISITONS - EDGEWATER NETWORKS, INC (Details) - USD ($)
$ in Thousands, shares in Millions
 12 Months Ended
Jun. 24, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mar. 08, 2019
Feb. 15, 2019
Business Acquisition [Line Items]            
Cash, net of cash acquired   $ 0 $ 46,389 $ 42,951    
Deferred purchase consideration   0 30,000      
Other income (expense), net   70,444 $ (3,772) $ 1,274    
Edgewater            
Business Acquisition [Line Items]            
Cash, net of cash acquired $ 46,400 46,389        
Shares issued to selling shareholders (in shares) 4.2          
Deferred purchase consideration $ 30,000       $ 21,900 $ 21,900
Deferred cash payments, within 6 months from closing date 15,000          
Deferred cash payments, within 9 to 18 months from closing date $ 15,000          
Other income (expense), net   $ 8,100        
Weighted average life of identifiable intangible assets (in years)     8 years 4 months 17 days      
Revenue attributable since acquisition     $ 21,500      
Net loss attributable to acquisition     $ 4,300