Annual report pursuant to Section 13 and 15(d)

Acquisition of Rental Property (Details)

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Acquisition of Rental Property (Details) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2011
Jun. 30, 2012
Prime Outlets at Jeffersonville [Member]
sqft
Dec. 31, 2011
Atlantic City and Ocean City [Member]
Dec. 31, 2012
Atlantic City Outlets The Walk [Member]
sqft
Dec. 31, 2012
Ocean City Factory Outlets [Member]
sqft
Sep. 30, 2011
The Outlets at Hershey [Member]
sqft
Dec. 31, 2011
Business Acquisitions, Combined [Member]
Acquistion of Rental Property [Line Items]              
Business Acquisition, Total Consideration Transfered For, and In Connection With The Acquisition           $ 56,000,000  
Business Acquisition, Purchase Price Allocation, Liabilities Assumed     83,500,000     31,400,000  
Business Acquisition, Cost of Acquired Entity, Purchase Price     200,300,000        
Business Acquisition, Cost of Acquired Entity, Cash Paid   134,000,000 116,800,000     24,600,000  
Square Footage of Real Estate Property   410,000   490,000 198,000 247,000  
Notes Receivable, Related Parties           6,200,000  
Business Combination, Acquisition Related Costs             2,700,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual 18,500,000            
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual $ 1,500,000