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BUSINESS ACQUISITONS - ANOVA DATA, INC (Details) - USD ($)
$ in Thousands, shares in Millions
12 Months Ended
Jan. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Shares of common stock issued as purchase consideration $ 15,200      
Goodwill   $ 224,896 $ 383,655 $ 335,716
Anova Data, Inc.        
Business Acquisition [Line Items]        
Shares issued to selling shareholders (in shares) 2.9      
Number of additional shares potentially issued (in number of shares) 0.3      
Fair value of additional shares potentially issued $ 1,700      
Fair value of total consideration 16,900      
Finite-lived intangibles 11,200      
Net assets acquired 200      
Goodwill   $ 5,500    
Weighted average life of identifiable intangible assets (in years)   6 years 3 months    
Customer relationships | Anova Data, Inc.        
Business Acquisition [Line Items]        
Adjustments to acquired intangibles   $ (2,000)    
Finite-lived intangibles 5,200      
Developed technology | Anova Data, Inc.        
Business Acquisition [Line Items]        
Adjustments to acquired intangibles   $ 2,000    
Finite-lived intangibles $ 6,000