Property and Equipment, Net (Property and Equipment, Net (Including Assets Held Under Capital Leases)) (Details) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Total property and equipment		$ 5,746,262	$ 5,710,350
Less: accumulated depreciation		(2,984,937)	(2,923,995)
Property and equipment, net	[1]	2,761,325	2,786,355
Towers and Related Components [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment		4,986,046	4,951,321
Construction-In-Process [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment		33,943	35,756
Furniture, Equipment and Vehicles [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment		46,450	54,814
Land, Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment		$ 679,823	$ 668,459

[1] On January 1, 2019, the Company adopted ASU 2016-02 which requires lessees to recognize a right-of-use asset and a lease liability. Upon adoption, certain assets and liabilities were reclassified to Right-of-use assets, net and lease liabilities in accordance with provisions of ASU 2016-02. See Note 1 for further discussion.