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COMMITMENTS AND CONTINGENCIES (Details) - Debt Instrument, Name [Domain] AWG in Millions, $ in Millions |  | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 17, 2010 USD ($) | Jan. 31, 2014 AWG | Jan. 31, 2014 USD ($) | Aug. 31, 2013 USD ($) | Nov. 30, 2007 USD ($) | Jun. 30, 2015 USD ($) item | Dec. 31, 2014 USD ($)
Commitments and contingencies |  |  |  |  |  |  |
Number of new funds created by FCC | item |  |  |  |  |  | 2 |
Period over which a portion of the Mobility Funds is used to offset the costs of supporting the networks |  |  |  |  |  | 5 years |
Renewal fee of telecommunications license |  | AWG 7.2 | $ 4.0 |  |  |  |
Letter of credit sub-facility |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  |  | $ 10.6 | $ 10.6
Wholesale Mobility Funds |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |
Mobility Funds approved by FCC |  |  |  | $ 21.7 |  |  |
Commitment fee (as a percent) |  |  |  |  |  | 1.75% |
Wholesale Mobility Funds | Letter of credit sub-facility |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  |  | $ 10.6 |
Universal Service Administrative Company | Letter of credit sub-facility |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |
Draw downs against issued letters of credit |  |  |  |  |  | $ 0.0 |
Lawsuit filed by CTL | Minimum |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |
Damages asserted |  |  |  |  | $ 200.0 |  |
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 |
Loss Contingency Period Over Which Spectrum Fees Are Disputed |  |  |  |  |  | 4 years |
Damages asserted | $ 9.0 |  |  |  |  |  |
Punitive damages | $ 5.0 |  |  |  |  |  |
Legal claims regarding tax filings with the Guyana Revenue Authority |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |
Future payments related to disputed tax assessments |  |  |  |  |  | $ 33.2 |
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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