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ACQUISITIONS - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2017
Sep. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]          
Purchase consideration, net of cash acquired     $ 5,315 $ 49,068 $ 220,203
Goodwill recorded in acquisition       $ 28,591  
Milgram & Company Ltd.          
Business Acquisition [Line Items]          
Purchase consideration, net of cash acquired $ 47,300        
Goodwill recorded in acquisition $ 28,300        
APC Logistics          
Business Acquisition [Line Items]          
Payments to acquire business   $ 229,400