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ACQUISITIONS (Narrative) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Nov. 01, 2018
USD ($)
Mar. 15, 2018
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]              
Cash consideration deferred         $ 0 $ 0 $ 2,260
Contingent consideration     $ 8,390   $ 8,390 0 0
Aggregate purchase price           $ 6,980 $ 5,580
Continuum              
Business Acquisition [Line Items]              
Effective date of acquisition   Mar. 15, 2018          
Cash consideration   $ 52,515          
Cash consideration placed in escrow   $ 5,410          
Estimated future operating results, period   12 months          
Maximum amount of earnout payable   $ 3,135          
Contingent consideration   $ 2,400          
Reduction to the fair value of the contingent consideration       $ (900)      
Escrow deposit released     $ 76        
Continuum | Design Consultant              
Business Acquisition [Line Items]              
Numbers of professionals acquired   125          
Think              
Business Acquisition [Line Items]              
Effective date of acquisition Nov. 01, 2018            
Cash consideration $ 26,254            
Cash consideration placed in escrow $ 3,237            
Escrow period 12 months            
Estimated future operating results, period 12 months            
Maximum amount of earnout payable $ 8,156            
Contingent consideration $ 5,990            
Minimum | Continuum              
Business Acquisition [Line Items]              
Escrow period   9 months          
Maximum | Continuum              
Business Acquisition [Line Items]              
Escrow period   15 months