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GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill |  |  |  |  |
Goodwill impairment |  |  | $ 0 |  |
Impairment charges |  |  | $ 0 | $ 0 | $ 11,425
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Sovernet |  |  |  |  |
Goodwill |  |  |  |  |
Impairment of long-lived assets |  | $ 3,600 |  |  | 3,600
Goodwill impairment |  | 7,500 |  |  | 7,500
Impairment charges |  | $ 11,100 |  |  | $ 11,100
Discounted rate used for cash flows (as a percent) |  |  |  |  | 14.00%
HURRICANES IRMA AND MARIA |  |  |  |  |
Goodwill |  |  |  |  |
Goodwill impairment | $ 0 |  |  |  |
Discounted rate used for cash flows (as a percent) | 14.50% |  |  |  |

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