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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Grants (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounting for grants      
Amount spent in capital expenditures $ 64,753 $ 58,300 $ 69,316
Minimum      
Accounting for grants      
Long-term power purchase agreements term 10 years    
Term of depreciation of grant 5 years    
Maximum      
Accounting for grants      
Long-term power purchase agreements term 25 years    
Term of depreciation of grant 20 years    
Stimulus programs      
Accounting for grants      
Amount spent in capital expenditures $ 99,300    
Amount that has been funded or will be funded 73,900    
Universal Service Fund programs      
Accounting for grants      
Amount received 7,900 3,900  
Amount available to support U.S wireless business relating to high-cost areas $ 1,300 $ 1,300