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GOODWILL AND INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2019
GOODWILL AND INTANGIBLE ASSETS |
Schedule of changes in the carrying amount of goodwill, by operating segment | The table below discloses goodwill recorded in each of the Company’s segments and accumulated impairment changes (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | International |  | US |  | Renewable |  | ​ | ​ | ​
​ | ​ | Telecom | ​ | Telecom | ​ | Energy | ​ | Consolidated | ​
Balance at December 31, 2017 | ​ | $ | 24,326 | ​ | $ | 35,268 | ​ | $ | 3,279 | ​ | $ | 63,970 | ​
Acquisitions | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​
Balance at December 31, 2018 | ​ | ​ | 24,326 | ​ | ​ | 35,268 | ​ | ​ | 3,279 | ​ | ​ | 63,970 | ​
Impairment | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (3,279) | ​ | ​ | (3,279) | ​
Balance at December 31, 2019 | ​ | $ | 24,326 | ​ | $ | 35,268 | ​ | $ | — | ​ | $ | 60,691 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | International | ​ | US | ​ | Renewable | ​ |  | ​ | ​
​ | ​ | Telecom | ​ | Telecom | ​ | Energy | ​ | Consolidated | ​
Balance at December 31, 2018 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Gross | ​ | $ | 24,326 | ​ | $ | 35,268 | ​ | $ | 3,279 | ​ | $ | 63,970 | ​
Accumulated Impairment | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​
Net | ​ |  | 24,326 | ​ |  | 35,268 | ​ |  | 3,279 | ​ |  | 63,970 | ​
Balance at December 31, 2019 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Gross | ​ | ​ | 24,326 | ​ | ​ | 35,268 | ​ | ​ | 3,279 | ​ | ​ | 63,970 | ​
Accumulated Impairment | ​ | ​ | — | ​ |  | — | ​ | ​ | (3,279) | ​ | ​ | (3,279) | ​
Net | ​ | $ | 24,326 | ​ | $ | 35,268 | ​ | $ | — | ​ | $ | 60,691 | ​
Schedule of changes in the carrying amount of the Company's telecommunications licenses, by operating segment | The changes in the carrying amount of the Company’s telecommunications licenses, by operating segment, were as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | International |  | US |  | ​ | ​ | ​
​ | ​ | Telecom | ​ | Telecom | ​ | Consolidated |
Balance at December 31, 2017 | ​ | $ | 23,347 | ​ | $ | 72,605 | ​ | $ | 95,952 | ​
Acquired licenses | ​ |  | — | ​ |  | 485 | ​ | ​ | 485 | ​
Dispositions | ​ |  | — | ​ |  | (2,751) | ​ | ​ | (2,751) | ​
Balance at December 31, 2018 | ​ | $ | 23,347 | ​ | $ | 70,339 | ​ | $ | 93,686 | ​
Acquired licenses | ​ |  | — | ​ |  | — | ​ | ​ | — | ​
Dispositions | ​ |  | — | ​ |  | — | ​ | ​ | — | ​
Balance at December 31, 2019 | ​ | $ | 23,347 | ​ | $ | 70,339 | ​ | $ | 93,686 | ​
Schedule of future amortization of customer relationships, in International Telcom segment | Future amortization of customer relationships, in its International Telecom segment, is as follows (in thousands):
​ | ​ | ​ | ​ | ​
​ |  | Future Amortization |
2020 |  | $ | 1,528 | ​
2021 |  | ​ | 1,300 | ​
2022 |  | ​ | 1,143 | ​
2023 |  | ​ | 827 | ​
2024 |  | ​ | 576 | ​
Thereafter | ​ | ​ | 2,067 | ​
Total | ​ | $ | 7,441 | ​

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