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GOVERNMENT GRANTS (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) item | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Universal Service Fund programs |  |  |  |  |  |
Government Grants |  |  |  |  |  |
Number of fund disbursement programs | item |  |  |  | 4 |  |
Mobility Funds |  |  |  |  |  |
Government Grants |  |  |  |  |  |
Mobility Funds received |  | $ 21.1 |  | $ 21.1 |  |
Mobility Funds | US Telecom |  |  |  |  |  |
Government Grants |  |  |  |  |  |
Grant funds used to offset fixed asset related costs |  | 7.2 |  | 7.2 |  |
Grant funds used to offset operating expenses |  | 13.9 |  | 13.9 |  |
High-Cost Support Program | HURRICANES IRMA AND MARIA | Grants |  |  |  |  |  |
Government Grants |  |  |  |  |  |
Revenue |  |  | $ 8.2 |  | $ 8.2 |
High-Cost Support Program | US Telecom |  |  |  |  |  |
Government Grants |  |  |  |  |  |
Revenue |  | 0.3 | 0.3 | 0.6 | 0.6 |
High-Cost Support Program | International Telecom |  |  |  |  |  |
Government Grants |  |  |  |  |  |
Revenue |  | 4.1 | 4.1 | 8.2 | 8.2 |
E-Rate, Lifeline and Rural Health Care Support Programs |  |  |  |  |  |
Government Grants |  |  |  |  |  |
Revenue |  | 1.6 | $ 2.1 | 3.2 | $ 4.3 |
E-Rate |  |  |  |  |  |
Government Grants |  |  |  |  |  |
Grant Funds Awarded |  |  |  | $ 15.4 |  |
Tribal Bidding Credit |  |  |  |  |  |
Government Grants |  |  |  |  |  |
Wireless service spectrum (in Mhz) |  |  |  | 600 |  |
Revenue |  |  |  |  |  | $ 7.4
Grant funds used to offset fixed asset related costs |  | 5.4 |  | $ 5.4 |  |
Grant funds used to offset operating expenses |  | 2.0 |  | 2.0 |  |
Connect America Fund Phase II Auction |  |  |  |  |  |
Government Grants |  |  |  |  |  |
Revenue |  | $ 1.5 |  | $ 1.5 |  |
Grant Funds Awarded | $ 79.9 |  |  |  |  |
Grant fund term | 10 years |  |  |  |  |

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