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FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 01, 2018
Mar. 15, 2018
Jun. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Business Acquisition, Contingent Consideration [Line Items]            
Acquisition of businesses, contingent consideration         $ (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 adjustmenteration, Liability     $ (396) $ (900)    
Think            
Business Acquisition, Contingent Consideration [Line Items]            
Estimated future operating results, period 12 months          
Contingent consideration liability $ 5,990          
Contingent consideration liability adjustmenteration, Liability     $ 1,752