Annual report pursuant to Section 13 and 15(d)

Tower Sale and Leaseback (Narratives) (Details)

v3.6.0.2
Tower Sale and Leaseback (Narratives) (Details) - Tower Sale [Member]
$ in Millions
1 Months Ended
Aug. 31, 2016
USD ($)
Sale Leaseback Transaction [Line Items]  
Number of cell sites sold 276
Net proceeds from sale of cell sites $ 90.8
Number of renewal options 8
Renewal period (in years) 5 years
Annual increase in lease payments, percentage 2.00%
Decrease in asset retirement obligation $ (3.4)
Interest rate on the Tower Obligation 7.10%
Minimum  
Sale Leaseback Transaction [Line Items]  
Lease term (in years) 10 years
Maximum  
Sale Leaseback Transaction [Line Items]  
Lease term (in years) 50 years