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ACQUISITIONS AND DISPOSITIONS - Purchase Price Allocation - Vibrant Energy (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 07, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Purchase price allocation:          
Goodwill   $ 63,970 $ 63,970 $ 62,873  
Consideration Transferred          
Transaction-related charges   2,642 $ 1,009 18,064  
Vibrant Energy          
Purchase price allocation:          
Cash $ 136        
Prepayments and other assets 636        
Property, plant and equipment 7,321        
Goodwill 3,279        
Accounts payable and accrued liabilities (5,179)        
Net assets acquired 6,193        
Consideration Transferred          
Total consideration 6,193        
Cash consideration 3,500        
Contingent Consideration 2,700 200      
Payments of contingent consideration   1,400      
Business combination contingent consideration not paid as operational milestones were not achieved   $ 1,100      
Transaction related charges relating to legal, accounting and consulting services. $ 11,400        
Transaction-related charges       $ 10,100 $ 1,300