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Beneficial Interest in Debt and Interest Expense (Specific Debt Instrument Detail) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Length Of Extension Option one year  
Notes Payable, Net $ 2,843,155 $ 2,627,088
The Gardens on El Paseo [Member]    
Debt Instrument [Line Items]    
Notes Payable, Net $ 81,500  
Debt Instrument, Interest Rate, Stated Percentage 6.10%  
Cherry Creek Shopping Center [Member]    
Debt Instrument [Line Items]    
Notes Payable, Net $ 280,000  
Debt Instrument, Interest Rate, Stated Percentage 5.24%  
Secondary Line of Credit [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 65,000