Acquisitions (Schedule Of Acquisition Capital Expenditures) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Business Acquisition [Line Items]
Towers and related intangible assets	$ 628,423,000	[1]	$ 2,205,859,000	[1]	$ 348,950,000	[1]
Ground lease land purchases	48,956,000	[2]	46,865,000	[2]	25,755,000	[2]
Earnouts	9,324,000		5,931,000		4,615,000
Total acquisition capital expenditures	686,703,000		2,258,655,000		379,320,000
Ground lease extensions	9,100,000		9,700,000		9,800,000
Brazilian Acquisiton [Member]
Business Acquisition [Line Items]
Total acquisition capital expenditures	$ 175,900,000

[1] Total acquisition capital expenditures for the year ended December 31, 2013, included $175.9 million related to an acquisition in Brazil which closed in the fourth quarter of 2012.

[2] In addition, the Company paid $9.1 million, $9.7 million, and $9.8 million for ground lease extensions during the years ending 2013, 2012, and 2011, respectively. The Company recorded these amounts in prepaid rent on its Consolidated Balance Sheet.