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BUSINESS ACQUISITIONS - Total Acquisition Consideration (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Cash payments   $ 10,811 $ 0 $ 0
ASI        
Business Acquisition [Line Items]        
Cash payments $ 10,811      
Fair value of stock issued 894      
Present value of estimated fair value of contingent earn-out consideration 4,006      
Total purchase price consideration $ 15,711