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GOVERNMENT GRANTS (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
item
Government Grants      
Revenue $ 117,788   $ 222,263
Universal Service Fund programs      
Government Grants      
Number of fund disbursement programs | item     4
Mobility Funds      
Government Grants      
Mobility Funds received 21,100   $ 21,100
Mobility Funds | U.S. Telecom      
Government Grants      
Grant funds used to offset fixed asset related costs 7,200   7,200
Mobility funds received and recorded to date 13,400   13,400
Mobility Funds | U.S. Telecom | Property, Plant and Equipment      
Government Grants      
Grant funds used to offset operating expenses 13,900   13,900
Mobility Funds | U.S. Telecom | Other long-term liabilities      
Government Grants      
Mobility Funds received 500   500
High-Cost Support Program | Grants | HURRICANES IRMA AND MARIA      
Government Grants      
Revenue 8,200    
High-Cost Support Program | Grants | U.S. Telecom      
Government Grants      
Revenue 300   600
High-Cost Support Program | Grants | International Telecom segment      
Government Grants      
Revenue 4,100   8,300
E-Rate, Lifeline and Rural Health Care Support Programs | Grants      
Government Grants      
Revenue 2,100   4,300
E-Rate | Grants      
Government Grants      
Revenue     $ 15,400
Tribal Bidding Credit      
Government Grants      
Wireless service spectrum (in Mhz) | item     600
Grant funds estimated to offset fixed asset related costs 5,400   $ 5,400
Grant funds estimated to offset operating expenses $ 2,000   $ 2,000
Tribal Bidding Credit | Grants      
Government Grants      
Revenue   $ 7,400