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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Nov. 30, 2007 | Dec. 31, 2018 | Dec. 31, 2011
Contingency related to spectrum fees |  |  |  |
Commitments and contingencies |  |  |  |
Spectrum fees paid |  |  |  | $ 2.6
Litigation proceedings and disputes in Guyana |  |  |  |
Commitments and contingencies |  |  |  |
Period for which litigation proceedings and other disputes have not been the subject of discussions or other significant activity |  |  | 5 years |
Lawsuit filed by CTL |  |  |  |
Commitments and contingencies |  |  |  |
Damages asserted | $ 25.0 | $ 200.0 |  |
Legal claims regarding tax filings with the Guyana Revenue Authority |  |  |  |
Commitments and contingencies |  |  |  |
Future payments related to disputed tax assessments |  |  | $ 44.1 |
Accrued contingent liability |  |  | $ 5.0 |
Legal claims regarding tax filings with the Guyana Revenue Authority | Minimum |  |  |  |
Commitments and contingencies |  |  |  |
Percentage of return on investment ensured by the government of Guyana |  |  | 15.00% |

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