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GOODWILL AND INTANGIBLE ASSETS - Rollforward (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Changes in the carrying amount of goodwill, by operating segment |  |  |  |
Balance at the beginning of the period |  | $ 63,970 | $ 63,970 |
Acquisitions |  |  | 0 |
Impairment |  | (3,279) | 0 | $ 0
Balance at the end of the period | $ 60,691 | 60,691 | 63,970 | 63,970
International Telecom |  |  |  |
Changes in the carrying amount of goodwill, by operating segment |  |  |  |
Balance at the beginning of the period |  | 24,326 | 24,326 |
Acquisitions |  |  | 0 |
Impairment |  | 0 |  |
Balance at the end of the period | 24,326 | 24,326 | 24,326 | 24,326
US Telecom |  |  |  |
Changes in the carrying amount of goodwill, by operating segment |  |  |  |
Balance at the beginning of the period |  | 35,268 | 35,268 |
Acquisitions |  |  | 0 |
Impairment |  | 0 |  |
Balance at the end of the period | 35,268 | 35,268 | 35,268 | 35,268
Renewable Energy |  |  |  |
Changes in the carrying amount of goodwill, by operating segment |  |  |  |
Balance at the beginning of the period |  | 3,279 | 3,279 |
Acquisitions |  |  | 0 |
Impairment | (3,300) | (3,279) |  |
Balance at the end of the period | $ 0 | $ 0 | $ 3,279 | $ 3,279

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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