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Significant Accounting Policies (Details 5) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Significant Accounting Policies      
Days past due for income recognition on debt and preferred equity investments to be suspended 90 days    
Reserve for Possible Credit Losses      
Loan loss reserves and charge offs $ 564,000 $ 6,722,000 $ 17,751,000
Recoveries recorded 2,436,000 4,370,000 3,662,000
Income taxes      
Minimum annual taxable income distributed to stockholders to maintain REIT qualification (as a percent) 90.00%    
Federal, state and local tax provision     900,000
Estimated tax payments 17,000 138,000 1,041,000
Debt and Preferred Equity Investments Held to Maturity
     
Reserve for Possible Credit Losses      
Loan loss reserves and charge offs 3,000,000 10,900,000 19,800,000
Debt and Preferred Equity Investments Held for Sale
     
Reserve for Possible Credit Losses      
Loan loss reserves and charge offs     $ 1,000,000