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FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Nov. 01, 2018
Mar. 15, 2018
Jun. 30, 2019
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition, Contingent Consideration [Line Items]              
Contingent consideration         $ 3,876 $ 8,390 $ 0
Cash payment to extinguish the earnout obligation         (1,104) $ 0 $ 0
Continuum              
Business Acquisition, Contingent Consideration [Line Items]              
Estimated future operating results, period   12 months          
Contingent consideration   $ 2,400          
Contingent consideration liability adjustment     $ (396) $ (900)      
Cash payment to extinguish the earnout obligation     $ (1,104)        
Think              
Business Acquisition, Contingent Consideration [Line Items]              
Estimated future operating results, period 12 months            
Contingent consideration $ 5,990            
Contingent consideration liability adjustment         $ 2,172    
Minimum | Other 2019 Acquisitions              
Business Acquisition, Contingent Consideration [Line Items]              
Estimated future operating results, period         12 months    
Maximum | Other 2019 Acquisitions              
Business Acquisition, Contingent Consideration [Line Items]              
Estimated future operating results, period         24 months