Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 Y	Dec. 31, 2010	Dec. 31, 2009
Income Tax Contingency [Line Items]
Closed Tax Years Subject to Examination by Authorities	2007
Real Estate, Federal Income Tax Basis	$ 5,800,000,000	$ 5,600,000,000
Distribution of REIT Taxable Income	100.00%
Income Tax Expense (Benefit)	0
Number of years subequent to a failed REIT Qualifing Test the Company would not be Qualified as a REIT	4
Liability for Uncertain Tax Positions, Current	0
Income Tax Examination, Penalties and Interest Expense	0	0	0
Income Tax Examination, Penalties and Interest Accrued	0	0
Valuation Allowance, Amount	19,300,000
Taxable REIT Subsidiary [Member]
Income Tax Contingency [Line Items]
Operating Loss Carryforwards	$ 19,300,000
Operating Loss Carryforwards, Expiration Dates	2018