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GOODWILL AND INTANGIBLE ASSETS - Customer Relationships (Details) - International Telecom - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Finite-lived intangible assets |  |  |
Other intangible assets | $ 4,500 |  |
Customer relationships |  |  |
Finite-lived intangible assets |  |  |
Amortization | 2,400 | $ 3,200 | $ 2,000
Future Amortization |  |  |
2019 | 1,897 |  |
2020 | 1,528 |  |
2021 | 1,300 |  |
2022 | 1,143 |  |
2023 | 828 |  |
Thereafter | 2,627 |  |
Total | 9,323 |  |
Franchise Rights |  |  |
Finite-lived intangible assets |  |  |
Other intangible assets | 3,000 |  |
Trade names |  |  |
Finite-lived intangible assets |  |  |
Other intangible assets | $ 1,500 |  |
Impairment of other intangibles |  |  | $ 300

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