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Mortgage and Other Notes Receivable (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Sep. 30, 2012
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 10, 2012
Dec. 31, 2012
Woodstock GA Investments LLC [Member]
May 31, 2012
Woodstock GA Investments LLC [Member]
Sep. 30, 2012
Mezzanine Loan [Member]
Sep. 30, 2012
Mezzanine Loan [Member]
Noncontrolling Interest Investor [Member]
Dec. 31, 2012
Outlet Shopping Center [Member]
Dec. 31, 2012
Interest Born at the Greater Of: [Member]
Outlet Shopping Center [Member]
Sep. 30, 2012
Interest Born at the Greater Of: [Member]
Mezzanine Loan [Member]
Apr. 20, 2012
Outlet Shoppes at El Paso [Member]
Mar. 31, 2012
Outlet Shoppes at El Paso [Member]
Mortgage and Other Notes Receivable [Line Items]                              
Percentage of assignment of the partnership interest     100.00%                        
Interest rates on mortgage and other notes receivable range , minimum     2.70%                        
Interest rates on mortgage and other notes receivable range, maximum     12.00%                        
Interest Rate     7.33% 8.76%     10.00%       13.00% 13.00%      
Intangible Assets Disclosure [Text Block]       December 31, 2011                      
Loan purchased, face amount                 $ 5,879           $ 9,150
Loan purchased, cost               6,581 5,300            
Equity Method Investment, Ownership Percentage                           75.00%  
Loan purchased, discount                 579            
Basis spread on variable rate 90000.00%                            
Loans receivable, variable rate spread                         10.00%    
Ownership interest upon conversion                 50.00% 12.60%          
Additional ownership interest acquirable upon election                 10.00%            
Potential ownership interest if additional election is made                 60.00%            
Loan agreement                     9,150        
Variable rate basis                     LIBOR plus 900 basis points        
Ownership interest in borrower if optional ownership election is made                     75.00%        
Business Acquisition, Percentage of Voting Interests Acquired           30.00% 75.00%                
Uncollectible receivable   3,735                          
Allowance for Loan and Lease Losses [Roll Forward]                              
Beginning Balance, January 1, 2011   0 0   0                    
Additions in allowance charged to expense   1,500 1,900                        
Reduction for charges against allowance (400)   (1,900)                        
Ending Balance, December 31, 2011   1,500 1,900                        
Mortgage and other notes receivable balance, fully collectible     $ 25,967 $ 34,239