Income Taxes (Details Textual) (USD $) In Thousands, except Per Share data, unless otherwise specified	1 Months Ended			12 Months Ended
	Nov. 30, 2009	Sep. 30, 2009	Sep. 30, 2008	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Jun. 30, 2009	Dec. 31, 2008
Preferred distributions per depositary share
Ordinary Income Per Depositary Share Increase Decrease					$ 1.4529
Qualified Dividends Per Depositary Share Increase Decrease					$ 0.0222
Unrecaptured Section Gain Per Depositary Share Increase Decrease					$ 0.0706
Return Of Capital Per Depositary Share Increase Decrease					$ (1.5457)
Income Taxes (Additional Textual) [Abstract]
Percentage of assets held by old taxable REIT subsidiaries		75.00%
Percentage of assets held by limited liability company		25.00%
Percentage of company owned by taxable REIT subsidiaries for tax purpose		99.00%
Period of carry back net operating losses	Up to 5 Years
Received refund from IRS due to the tax liquidation of the taxable REIT subsidiaries		$ 40,418	$ 3,767			$ 40,418
Net deferred tax assets				(120)	863	776
Valuation Allowance				(5,078)	(9,301)	1,299
Increase decrease in net deferred tax assets and liabilities due to sales of property				(4,223)	8,002
Tax and interest								1,400
Tax and interest accrued		800					800
Reversal of income tax receivables					2,200
Recognized Tax expenses					1,400
Reversal of accrual tax benefit		800
Reversal of receivable					1,400
Reversal of prior tax expanse					$ 2,200