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FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Nov. 01, 2018
Mar. 15, 2018
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition, Contingent Consideration [Line Items]              
Cash payment to extinguish the earnout obligation           $ (1,104) $ 0
Continuum              
Business Acquisition, Contingent Consideration [Line Items]              
Estimated future operating results, period   12 months          
Contingent consideration liability   $ 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 liability $ 5,990            
Contingent consideration liability adjustment       $ 1,752      
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