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ACQUISITIONS AND DISPOSITIONS - Purchase Price Allocation - Vibrant Energy (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 07, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Purchase price allocation:        
Goodwill   $ 63,970 $ 62,873 $ 45,077
Consideration Transferred        
Transaction-related charges   1,009 16,279 7,182
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   4,900    
Contingent Consideration   $ 1,300    
Transaction related charges relating to legal, accounting and consulting services. $ 11,400      
Transaction-related charges     $ 10,100 $ 1,300