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GOODWILL AND INTANGIBLE ASSETS - Rollforward (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Changes in the carrying amount of goodwill, by operating segment |  |
Balance at the beginning of the period | $ 62,873 | $ 45,077
Acquisitions | 1,097 | 26,986
Deconsolidation of Subsidiary |  | (1,698)
Impairment | 0 | (7,492)
Goodwill, Gross | 63,970 | 70,365
Accumulated impairment |  | (7,492)
Balance at the end of the period | 63,970 | 62,873
U.S. Telecom |  |
Changes in the carrying amount of goodwill, by operating segment |  |
Balance at the beginning of the period | 35,268 | 39,639
Acquisitions |  | 3,121
Impairment |  | (7,492)
Goodwill, Gross | 35,268 | 42,760
Accumulated impairment |  | (7,492)
Balance at the end of the period | 35,268 | 35,268
International |  |
Changes in the carrying amount of goodwill, by operating segment |  |
Balance at the beginning of the period | 24,326 | 5,438
Acquisitions | 1,097 | 20,586
Deconsolidation of Subsidiary |  | (1,698)
Goodwill, Gross | 25,423 | 24,326
Balance at the end of the period | 25,423 | 24,326
Renewable Energy |  |
Changes in the carrying amount of goodwill, by operating segment |  |
Balance at the beginning of the period | 3,279 |
Acquisitions |  | 3,279
Goodwill, Gross | 3,279 | 3,279
Balance at the end of the period | $ 3,279 | $ 3,279

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