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GOVERNMENT GRANTS (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2018 USD ($) | Mar. 31, 2019 USD ($) item | Mar. 31, 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 |  |
Mobility Funds | U.S. Telecom |  |  |  |
Government Grants |  |  |  |
Grant funds used to offset fixed asset related costs |  | 7.2 |  |
Grant funds used to offset operating expenses |  | 13.9 |  |
High-Cost Support Program | U.S. Telecom |  |  |  |
Government Grants |  |  |  |
Revenue |  | 0.3 | $ 0.3 |
High-Cost Support Program | International Telecom |  |  |  |
Government Grants |  |  |  |
Revenue |  | 4.1 | 4.1 |
E-Rate, Lifeline and Rural Health Care Support Programs |  |  |  |
Government Grants |  |  |  |
Revenue |  | 1.5 | $ 2.2 |
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 |  |
Grant funds used to offset operating expenses |  | $ 2.0 |  |
Connect America Fund Phase II Auction |  |  |  |
Government Grants |  |  |  |
Grant Funds Awarded | $ 79.9 |  |  |
Grant fund term | 10 years |  |  |

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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