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Related Parties
12 Months Ended
Dec. 31, 2017
Related Party Transactions [Abstract]  
RELATED PARTIES
RELATED PARTIES
A member of our Board of Directors also serves as a director for an entity that leases transmission tower sites to the Company. For the years ended December 31, 2017, 2016 and 2015, we incurred $3.8 million, $3.9 million and $4.1 million, respectively, in site rent expenses from the entity on which the individual serves as a director. These amounts are included in service, rental and maintenance expenses.