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GOVERNMENT GRANTS (Details 2) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2014 Letter of credit sub-facility | Aug. 31, 2013 Mobility Funds | Sep. 30, 2014 Mobility Funds U.S. Wireless | Sep. 30, 2014 Mobility Funds U.S. Wireless Liability | Sep. 30, 2014 Mobility Funds U.S. Wireless Other current liabilities | Sep. 30, 2014 Mobility Funds U.S. Wireless Other long-term liabilities | Jun. 30, 2014 Tribal Mobility Fund
MOBILITY FUND GRANTS |  |  |  |  |  |  |  |
Mobility Funds approved by FCC |  |  | $ 21.7 |  |  |  |  | $ 2.4
Period over which a portion of the Mobility Funds is used to offset the costs of supporting the networks | 5 years |  |  |  |  |  |  |
Letters of credit posted to USAC |  | 10.5 |  |  |  |  |  |
Amount of letters of credit drawn |  | 0 |  |  |  |  |  |
Mobility Funds received |  |  |  | 7.4 | 6.1 | 2.3 | 3.8 |
Grant funds used to offset fixed asset related costs |  |  |  | $ 1.3 |  |  |  |

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