Quarterly report pursuant to Section 13 or 15(d)

Investments in Unconsolidated Real Estate Joint Ventures (Narrative) (Details)

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Investments in Unconsolidated Real Estate Joint Ventures (Narrative) (Details) (USD $)
3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Deer Park [Member]
Dec. 31, 2012
Deer Park [Member]
Mar. 31, 2013
Deer Park [Member]
Mezzanine and Senior Loans Combined [Member]
Dec. 31, 2011
Deer Park [Member]
Mezzanine and Senior Loans Combined [Member]
Mar. 31, 2013
Deer Park [Member]
Mezzanine Loan [Member]
Mar. 31, 2013
Deer Park [Member]
Senior Loans [Member]
Mar. 31, 2013
Deer Park Warehouse [Member]
Dec. 31, 2012
Deer Park Warehouse [Member]
Mar. 31, 2013
National Harbor [Member]
sqft
Mar. 31, 2012
National Harbor [Member]
Dec. 31, 2012
National Harbor [Member]
Mar. 31, 2013
RioCan Canda [Member]
Dec. 31, 2012
RioCan Canda [Member]
Mar. 31, 2013
Westgate [Member]
Dec. 31, 2012
Westgate [Member]
Schedule of Equity Method Investments [Line Items]                                  
Equity method investments $ 134,000,000 $ 126,600,000 $ 2,400,000 $ 3,000,000           $ 0 $ 2,600,000   $ 2,600,000 $ 66,800,000 $ 62,200,000 $ 19,600,000 $ 19,100,000
Secured debt           246,900,000                      
Interest rate terms             LIBOR + 5.00% LIBOR + 3.50%                  
Additional Capital Contribution Required to Remedy Default         14,200,000                        
Additional Capital Contributions Made to Remedy Default by Date of Filing         0                        
Debt Instrument, Default Interest Rate             LIBOR + 9% PRIME + 7.5%                  
Proceeds from sale of foreclosed assets                 1,200,000                
Number of outlet stores                     80            
Estimated square footage of real estate property when completed                     340,000            
Company portion of contributed capital to the joint venture                       2,600,000          
Payments to acquire real estate                           13,900,000      
Joint Venture Debt                     $ 61,000,000            
Interst Rate, Basis Spread on Variable Rate                     1.65%