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GOVERNMENT GRANTS (Details 2) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Letters of credit
Aug. 31, 2013
Mobility Funds
Jun. 30, 2014
Mobility Funds
U.S. Wireless
Jun. 30, 2014
Mobility Funds
U.S. Wireless
Liability
Jun. 30, 2014
Mobility Funds
U.S. Wireless
Other current liabilities
Jun. 30, 2014
Mobility Funds
U.S. Wireless
Other long-term liabilities
Jun. 30, 2014
Tribal Mobility Fund
GOVERNMENT 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   11.0            
Amount of letters of credit drawn   0            
Mobility Funds received       7.3 6.1 2.3 3.8  
Grant funds used to offset fixed asset related costs       $ 1.4