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GOODWILL AND INTANGIBLE ASSETS - Net (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Changes in the carrying amount of goodwill, by operating segment |  |  |
Goodwill, Gross | $ 60,691 | $ 63,970 |
Accumulated impairment | 0 | (3,279) |
Goodwill, Total | 60,691 | 60,691 | $ 63,970
International Telecom |  |  |
Changes in the carrying amount of goodwill, by operating segment |  |  |
Goodwill, Gross | 24,326 | 24,326 |
Accumulated impairment | 0 | 0 |
Goodwill, Total | 24,326 | 24,326 | 24,326
US Telecom |  |  |
Changes in the carrying amount of goodwill, by operating segment |  |  |
Goodwill, Gross | 35,268 | 35,268 |
Accumulated impairment | 0 | 0 |
Goodwill, Total | 35,268 | 35,268 | 35,268
Renewable Energy |  |  |
Changes in the carrying amount of goodwill, by operating segment |  |  |
Goodwill, Gross | 0 | 3,279 |
Accumulated impairment | 0 | (3,279) |
Goodwill, Total | $ 0 | $ 0 | $ 3,279

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