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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, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jul. 14, 2017
USD ($)
Business Acquisition [Line Items]              
Goodwill       $ 12,603 $ 40,704    
Lonestar              
Business Acquisition [Line Items]              
Payments to acquire businesses $ 41.8 $ 33,100          
Equity payout (in CAD per share) | $ / shares $ 0.72            
Debt assumed $ 21.3           $ 16,800
Goodwill   $ 2,800          
2017 Acquisitions              
Business Acquisition [Line Items]              
Goodwill     $ 5,000        
Purchase price     $ 11,900        
Revenue from acquisition included in the company's result of operations           $ 14,500