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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Grants (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounting for grants      
Amount spent in capital expenditures $ 124,282 $ 64,753 $ 58,300
U.S. Telecom      
Accounting for grants      
Amount received $ 9,500 1,300  
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 $ 17,700 $ 7,900