Summary of Significant Accounting Policies (Details Textual) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	1 Months Ended		12 Months Ended				1 Months Ended		12 Months Ended		1 Months Ended
	Mar. 23, 2012	Nov. 18, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Mar. 23, 2012 Series D Cumulative Redeemable Preferred Shares [Member]	Nov. 30, 2011 Series D Cumulative Redeemable Preferred Shares [Member]	Dec. 31, 2012 Series D Cumulative Redeemable Preferred Shares [Member]	Dec. 31, 2011 Series D Cumulative Redeemable Preferred Shares [Member]	Nov. 18, 2011 Series B One Preferred Stock [Member]
Class of Stock [Line Items]
Number of Shares Issued / Repurchase							3,220	1,600
Series D Cumulative Redeemable Preferred Shares of beneficial interest rate								9.25%
Series D Cumulative Redeemable Preferred Shares							$ 25.0385	$ 25.00
Series D Preferred Shares, par value	$ 1							$ 1
Net proceeds	$ 77,563,000		$ 77,563,000	$ 38,378,000				$ 38,378,000
Repurchases of series B-1 Preferred Shares											100,000
Dividends paid or accrued per Series C Preferred Share			$ 0.40625						$ 2.31	$ 0.21
Summary of Significant Accounting Policies (Textual) [Abstract]
Net income loss related to reclassification as held for sale						700,000
Net income loss related to the capitalization of certain legal costs						228,000
Net income loss related to lease termination fee income					450,000
Estimated useful lives of buildings			40 years
Maturity period of highly liquid investments			three months or less
Rent adjustment increased revenue			(5,415,000)	(1,907,000)	403,000
Straight line rent receivables			17,241,000	11,858,000
Percentage of taxable income distributed to shareholders			90.00%
Percentage of TRS stock cannot exceed of Trust's total assets			20.00%
Income tax expense			234,000	379,000	133,000
Deferred tax assets and liabilities, net			0
Exceed value of total assets			0.00%
Series C Preferred Shares accrued dividend		$ 25,000,000	$ 742,000
Repurchase of cumulative convertible redeemable preferred shares, percentage		100.00%
Preferred Stock, Liquidation Preference Percentage			6.50%
Weighted-average stock options			1,000