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BUSINESS ACQUISITONS - EDGEWATER NETWORKS, INC (Details) - USD ($)
$ in Thousands, shares in Millions
 3 Months Ended 12 Months Ended
Jun. 24, 2018
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Feb. 15, 2019
Business Acquisition [Line Items]            
Cash, net of cash acquired     $ 46,389 $ 42,951 $ 20,669  
Deferred purchase consideration   $ 30,000 30,000 $ 0    
Decrease of current assets   700        
Increase to current liabilities   500        
Net increase to goodwill   $ 1,300        
Edgewater            
Business Acquisition [Line Items]            
Cash, net of cash acquired $ 46,400   $ 46,389      
Shares issued to selling shareholders 4.2          
Deferred purchase consideration $ 30,000          
Deferred cash payments, within 6 months from closing date 15,000          
Deferred cash payments, within 9 to 18 months from closing date $ 15,000          
Weighted average life of identifiable intangible assets (in years)     8 years 5 months      
Revenue attributable since acquisition     $ 21,500      
Net loss attributable to acquisition     $ 4,300      
Subsequent Event | Scenario, Adjustment | Edgewater            
Business Acquisition [Line Items]            
Deferred purchase consideration           $ 21,900