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BUSINESS COMBINATIONS (2017 Acquisitions) (Details)
$ / shares in Units, $ in Thousands, $ in Millions
6 Months Ended
Jul. 14, 2017
CAD ($)
$ / shares
Jul. 14, 2017
USD ($)
Jan. 31, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jul. 14, 2017
USD ($)
Business Acquisition [Line Items]          
Goodwill recognized       $ 21,626  
Lonestar          
Business Acquisition [Line Items]          
Cash paid to acquire Lonestar $ 41.8 $ 33,100      
Equity payout (in CAD per share) | $ / shares $ 0.72        
Debt outstanding assumed $ 21.3       $ 16,800
Goodwill recognized   $ 2,800      
2017 Acquisitions          
Business Acquisition [Line Items]          
Goodwill recognized     $ 5,000    
Purchase price     $ 11,900