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BUSINESS COMBINATIONS (2017 Acquisitions) (Details)
$ / shares in Units, $ in Thousands, $ in Millions
12 Months Ended
Jul. 14, 2017
CAD ($)
$ / shares
Jul. 14, 2017
USD ($)
Jan. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jul. 14, 2017
USD ($)
Business Acquisition [Line Items]            
Goodwill amount       $ 40,704 $ 8,687  
Lonestar            
Business Acquisition [Line Items]            
Goodwill amount   $ 2,800        
Payments to acquire businesses $ 41.8 $ 33,100        
Equity payout (in CAD per share) | $ / shares $ 0.72          
Debt assumed $ 21.3         $ 16,800
2017 Acquisitions            
Business Acquisition [Line Items]            
Purchase price     $ 11,900      
Goodwill amount     $ 5,000      
Revenue from acquisition included in the company's result of operations         $ 14,500