Annual report pursuant to Section 13 and 15(d)

Tower Sale and Leaseback (Balance Sheet Impact) (Details)

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Tower Sale and Leaseback (Balance Sheet Impact) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Tower Sale and Leaseback [Abstract]    
Property and equipment, net $ 19,094 $ 18,792
Tower obligations $ 93,606 $ 87,653