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BUSINESS ACQUISITONS - TAQUA, LLC ACQUISITION (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 26, 2016
Apr. 30, 2018
Dec. 31, 2018
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]                
Cash, net of cash acquired           $ 46,389 $ 42,951 $ 20,669
Net reduction in goodwill     $ (1,300)          
Goodwill     $ 383,655   $ 49,393 $ 383,655 $ 335,716 49,393
Taqua, LLC                
Business Acquisition [Line Items]                
Cash, net of cash acquired $ 19,919              
Current assets 10,000              
Primary adjustments, increase to current liabilities       $ 400        
Primary adjustments, increase to noncurrent liabilities       $ 100        
Reversal of contingent liability         10,000      
Net reduction in goodwill         2,200      
Goodwill 9,581              
Business combination, pro forma revenue               1,900
Earnings (loss) attributable to acquisition               $ 4,700
Taqua, LLC | Developed technology                
Business Acquisition [Line Items]                
Increase (decrease) in intangible assets         (12,100)      
Taqua, LLC | Customer relationships                
Business Acquisition [Line Items]                
Increase (decrease) in intangible assets         $ 5,500      
Taqua, LLC | Maximum                
Business Acquisition [Line Items]                
Current assets $ 65,000              
Taqua Settlement Agreement                
Business Acquisition [Line Items]                
Release of funds held in escrow   $ 600            
Payment in lieu of future payments under agreement   1,400            
Total amount paid under settlement   $ 2,000