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ACQUISITIONS (Narrative) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Nov. 16, 2015
USD ($)
Jul. 10, 2015
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]            
Cash consideration       $ 6,980 $ 5,580  
Cash consideration deferred       $ 0 $ 2,260 $ 30,274
NavigationArts            
Business Acquisition [Line Items]            
Cash consideration   $ 28,747        
Cash consideration deferred     $ 1,797      
Goodwill deductable for tax purposes   $ 23,794        
NavigationArts | Design Consultant            
Business Acquisition [Line Items]            
Numbers of professionals acquired   90        
AGS            
Business Acquisition [Line Items]            
Cash consideration $ 51,717          
AGS | IT professionals            
Business Acquisition [Line Items]            
Numbers of professionals acquired 1,151