Property And Equipment, Net (Property And Equipment, Net (Including Assets Held Under Capital Leases)) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 5,232,033	$ 4,976,259
Less: accumulated depreciation	(2,439,957)	(2,193,906)
Property and equipment, net	2,792,076	2,782,353
Towers And Related Components [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	4,563,756	4,370,664
Construction-In-Process [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	38,926	32,730
Furniture, Equipment And Vehicles [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	50,671	48,018
Land, Buildings, and Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 578,680	$ 524,847