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ACQUISITIONS AND DISPOSITIONS - Disposition - Sovernet (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 08, 2017 | Jun. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Assets and liabilities disposed |  |  |  |  |
Purchase of non-controlling interests |  |  | $ 9,663 | $ 2,026 | $ 3,598
Loss on deconsolidation of subsidiary |  |  |  | 529 |
Impairment charges |  |  | 0 | 0 | 11,425
Goodwill impairment |  |  | $ 0 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Sovernet |  |  |  |  |
Disposition |  |  |  |  |
Contingent consideration | $ 2,000 |  |  |  |
Fair value of contingent consideration |  |  |  | 0 |
Total cash proceeds including working capital adjustments | 25,926 |  |  |  |
Assets and liabilities disposed |  |  |  |  |
Cash | 1,821 |  |  |  |
Accounts receivable | 1,696 |  |  |  |
Inventory | 639 |  |  |  |
Prepayments and other current assets | 1,034 |  |  |  |
Property, plant and equipment | 25,294 |  |  |  |
Other assets | 288 |  |  |  |
Accounts payable and accrued liabilities | (1,718) |  |  |  |
Advance payments and deposits | (1,897) |  |  |  |
Net assets disposed | 27,157 |  |  |  |
Consideration less net assets disposed | (1,231) |  |  |  |
Transaction costs: | (1,156) |  |  |  |
(Loss) Gain | (2,387) |  |  |  |
Purchase of non-controlling interests | 700 |  |  |  |
Non-controlling interest book value | 0 |  |  |  |
Loss on deconsolidation of subsidiary | 500 |  |  |  |
Transaction-related charges |  |  |  | $ 600 | 600
Impairment charges |  | $ 11,100 |  |  | 11,100
Impairment of long-lived assets |  | 3,600 |  |  | 3,600
Goodwill impairment |  | $ 7,500 |  |  | $ 7,500
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Sovernet | Maximum |  |  |  |  |
Disposition |  |  |  |  |
Contingent consideration | $ 4,000 |  |  |  |

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