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Loans Receivable, net (Details 4) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Recorded investment in loans, aged by payment status and presented by class    
Current $ 1,304,918  
Less Than and Equal to 90 Days 3,138  
Greater Than 90 Days 804,707  
Total Past Due 807,845  
Total 2,112,763 2,364,315
Senior mortgages
    
Recorded investment in loans, aged by payment status and presented by class    
Current 840,666  
Less Than and Equal to 90 Days 3,138  
Greater Than 90 Days 740,800  
Total Past Due 743,938  
Total 1,584,604  
Subordinate mortgages
    
Recorded investment in loans, aged by payment status and presented by class    
Current 61,236  
Less Than and Equal to 90 Days 0  
Greater Than 90 Days 53,797  
Total Past Due 53,797  
Total 115,033  
Corporate/Partnership loans
    
Recorded investment in loans, aged by payment status and presented by class    
Current 403,016  
Less Than and Equal to 90 Days 0  
Greater Than 90 Days 10,110  
Total Past Due 10,110  
Total $ 413,126