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GOODWILL AND INTANGIBLE ASSETS - Customer Relationships (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Finite-lived intangible assets |  |  |
Impairment of other intangibles | $ 300 |  |
U.S. Telecom |  |  |
Finite-lived intangible assets |  |  |
Other intangible assets | 4,900 |  |
Customer relationships |  |  |
Finite-lived intangible assets |  |  |
Amortization | 2,000 | $ 400 | $ 300
Customer relationships | International Telecom |  |  |
Future Amortization |  |  |
2017 | 3,281 |  |
2018 | 2,411 |  |
2019 | 1,897 |  |
2020 | 1,528 |  |
2021 | 1,300 |  |
Thereafter | 4,612 |  |
Total | 15,029 |  |
Franchise Rights | U.S. Telecom |  |  |
Finite-lived intangible assets |  |  |
Other intangible assets | 3,000 |  |
Trade names | U.S. Telecom |  |  |
Finite-lived intangible assets |  |  |
Other intangible assets | $ 1,900 |  |

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