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GOODWILL AND INTANGIBLE ASSETS - Rollforward (Details) - USD ($) $ in Thousands | 12 Months Ended | 24 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Roll Forward] |  |
Changes in the carrying amounts of goodwill |  | $ 0
Balance at the beginning of the period | $ 45,077 |
Acquisitions | 26,986 |
Deconsolidation of Subsidiary | (1,698) |
Impairment charge | (7,491) |
Goodwill, Gross | 70,364 |
Accumulated impairment | (7,491) |
Balance at the end of the period | 62,873 | 45,077
U.S. Telecom |  |
Goodwill [Roll Forward] |  |
Balance at the beginning of the period | 39,639 |
Acquisitions | 3,121 |
Impairment charge | (7,491) |
Goodwill, Gross | 42,759 |
Accumulated impairment | (7,491) |
Balance at the end of the period | 35,268 | 39,639
International Telecom |  |
Goodwill [Roll Forward] |  |
Balance at the beginning of the period | 5,438 |
Acquisitions | 20,586 |
Deconsolidation of Subsidiary | (1,698) |
Goodwill, Gross | 24,326 |
Balance at the end of the period | 24,326 | $ 5,438
Renewable energy |  |
Goodwill [Roll Forward] |  |
Acquisitions | 3,279 |
Goodwill, Gross | 3,279 |
Balance at the end of the period | $ 3,279 |

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