Schedule III - Real Estate And Accumulated Depreciation (Activity Of Real Estate And Accumulated Depreciation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Gross amount at beginning	$ 8,316,547		$ 7,192,641
Adjusted real estate gross at carrying value			8,290,313	[1]
Acquisitions through foreclosures	0	[1]	0
Other acquisitions	1,415,171	[1],[2]	739,144	[2]
Discretionary capital projects	314,126	[1],[3]	217,935	[3]
Discretionary ground lease purchases	102,991	[1],[4]	93,990	[4]
Redevelopment capital expenditures	89,960	[1],[5]	67,309	[5]
Capital improvements	58,960	[1],[6]	70,453	[6]
Start-up capital expenditures	15,757	[1],[7]	0	[7]
Other additions	8,764	[1],[8]	30,813	[8]
Total additions	2,005,729	[1]	1,219,644
Cost of real estate sold or disposed	(48,467)	[1]	(15,288)
Other deductions	(243,958)	[1],[9]	(80,450)	[9]
Total deductions	(292,425)	[1]	(95,738)
Balance at end	10,003,617	[1]	8,316,547
SEC Schedule III, Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Gross amount of accumulated depreciation at beginning	(2,968,230)		(2,646,927)
Depreciation	(408,693)		(344,778)
Other additions	(264)		(253)
Total additions	(408,957)		(345,031)
Amount of accumulated depreciation for assets sold or disposed	17,462		10,920
Other deductions	62,692	[9]	12,808	[9]
Total deductions	80,154		23,728
Balance at end	$ (3,297,033)		$ (2,968,230)

[1] Balance has been revised to reflect purchase accounting measurement period adjustments.

[2] Includes acquisitions of sites.

[3] Includes amounts incurred primarily for the construction of new sites.

[4] Includes amounts incurred to purchase or otherwise secure the land under communications sites.

[5] Includes amounts incurred to increase the capacity of existing sites, which results in new incremental tenant revenue.

[6] Includes amounts incurred to maintain existing sites.

[7] Includes amounts incurred for acquisitions and new market launches and costs that are contemplated in the business cases for these investments.

[8] Primarily includes regional improvements and other additions.

[9] Primarily includes foreign currency exchange rate fluctuations.