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Beneficial Interest in Debt and Interest Expense (Debt Covenants and Guarantees) (Details) (USD $)
9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Guarantor Obligations [Line Items]    
Other Restrictions on Payment of Dividends 0.95  
Restricted cash $ 43,258,000 $ 5,046,000
Cash in escrow related to construction projects 39,600,000  
The Mall of San Juan [Member]
   
Guarantor Obligations [Line Items]    
Construction Loan 116,000,000  
Interest Payable $ 100,000