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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

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