Real Estate And Accumulated Depreciation (Activity Of Real Estate And Accumulated Depreciation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
ReconciliationOfCarryingAmountOfRealEstateInvestmentsRollForward
Gross amount at which carried at beginning of period	$ 7,192,641
Real Estate, Acquisitions Through Foreclosures	0
Other acquisitions	739,144	[1]
Discretionary capital projects	217,935	[2]
Discretionary ground lease purchases	93,990	[3]
Redevelopment capital expenditures	67,309	[4]
Capital improvements	70,453	[5]
Other Additions	30,813	[6]
Total additions	1,219,644
Cost of real estate sold or disposed	(15,288)
Other Deductions	(80,450)	[7]
Total deductions	(95,738)
Balance at close period	8,316,547
ReconciliationOfRealEstateAccumulatedDepreciationRollForward
Gross amount of accumulated depreciation at beginning of period	(2,646,927)
Depreciation	(344,778)
Other Additions	(253)
Total additions	(345,031)
Amount of accumulated depreciation for assets sold or disposed	10,920
Other deductions	12,808
Total deductions	23,728
Balance at close of period	$ (2,968,230)

[1] Other acquisitions include acquisitions of sites.

[2] Discretionary capital projects include amounts incurred primarily for the construction of new sites.

[3] Discretionary ground lease purchases include amounts incurred to purchase or otherwise secure the land under communications sites.

[4] Redevelopment capital expenditures include amounts incurred to increase the capacity of existing sites, which results in new incremental tenant revenue.

[5] Capital improvements include amounts incurred to maintain existing sites.

[6] Primarily includes asset retirement obligations and regional improvements

[7] Primarily includes foreign currency exchange rate fluctuations.