Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Related Party Transaction [Line Items]
Property Management Fee, Percent Fee	7.50%
Distributions to Member	$ (62,315)	$ (53,831)	$ (159,623)	$ (143,402)
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Percentage of Towers Where Land is Owned by Related Party	30.00%		30.00%
Accumulated Earnings (Deficit) [Member]
Related Party Transaction [Line Items]
Distributions to Member	$ (41,218)	(31,782)	$ (81,936)	(64,848)
Members' Equity [Member]
Related Party Transaction [Line Items]
Distributions to Member	$ (21,097)	$ (22,049)	(77,687)	(78,554)
Net Equity contribution (distribution) from parent [Member] | Members' Equity [Member]
Related Party Transaction [Line Items]
Distributions to Member			$ (159,623)	$ (143,402)