Quarterly report pursuant to Section 13 or 15(d)

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

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Investment in Unconsolidated Real Estate Joint Ventures (Narrative) (Details) (Details) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2011
Deer Park [Member]
Jun. 30, 2011
Deer Park [Member]
Jun. 30, 2011
Houston [Member]
SquareFeet
Jun. 30, 2011
National Harbor [Member]
SquareFeet
Schedule of Equity Method Investments [Line Items]            
Debt Instrument, Debt Default, Amount     $ 269,300,000 $ 269,300,000    
Weighted Average Default Interest Rate on Debt     9.20%      
Estimated Additional Construction and Tenant Improvements Required     11,000,000 11,000,000    
Debt Instrument, Debt Default, Description of Notice of Default     May 17, 2011      
Equity Method Investments 4,600,000 6,400,000 108,000 [1] 108,000 [1]    
Completion Guarantee     11,000,000 11,000,000    
Cash and Cash Equivalents, at Carrying Value     11,600,000 11,600,000    
Accrued Interest     $ 4,200,000 $ 4,200,000    
Joint Venture Formation Date         June 30, 2011 May 23, 2011
Number of Outlet Stores         90 80
Phase One Square Footage         350,000  
Square Footage of Real Estate Property       683,033 [1] 470,000 350,000
[1] Includes a 29,253 square foot warehouse adjacent to the shopping center with a mortgage note of approximately $2.3 million.