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BUSINESS ACQUISITIONS - Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended
Jan. 01, 2018
Sep. 30, 2018
Dec. 31, 2017
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Contingent Consideration Liability      
Business Acquisition [Line Items]      
Fair value of contingent consideration liability   $ 4,084 $ 0
ASI      
Business Acquisition [Line Items]      
Purchase price of acquisition in cash and stock $ 11,700    
Contingent consideration 4,000    
Cash consideration paid 10,792    
Value of Company's common stock issued in acquisition 894    
Sales contributed by acquiree since acquisition   35,000  
Earnings before taxes contributed by acquiree since acquisition   4,100  
Contingent consideration, maximum $ 4,600 3,100  
Payment period of contingent consideration 3 years    
Contingent consideration, current   1,500  
ASI | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Contingent Consideration Liability      
Business Acquisition [Line Items]      
Fair value of contingent consideration liability $ 4,100 $ 4,100