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Acquisitions (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Dec. 31, 2012
Dec. 10, 2012
Jun. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
Sep. 30, 2011
Northgate Mall [Member]
Dec. 26, 2012
Imperial Valley Mall [Member]
Dec. 27, 2012
Kirkwood Mall [Member]
May 16, 2012
Dakota Square Mall [Member]
Jun. 30, 2012
Outlet Shoppes at Gettysburg [Member]
Apr. 17, 2012
Outlet Shoppes at Gettysburg [Member]
Apr. 20, 2012
Outlet Shoppes at El Paso [Member]
Mar. 31, 2012
Outlet Shoppes at El Paso [Member]
Apr. 20, 2012
Outlet Shoppes at El Paso and El Paso Outparcels [Member]
Dec. 31, 2012
Kirkwood, Dakota, Gettysburg, El Paso Purchases [Member]
Oct. 31, 2010
Parkway Place, L.P. [Member]
Parkway Place [Member]
Dec. 26, 2012
Imperial Valley Mall [Member]
Apr. 20, 2012
The Outlet Shoppes at El Paso vacant land [Member]
El Paso Outlet Outparcels, LLC [Member]
Apr. 20, 2012
Outlet Shoppes at El Paso [Member]
Dec. 27, 2012
Kirkwood Mall Mezz, LLC [Member]
Business Acquisition [Line Items]                                        
Percentage of interest acquired   30.00%         40.00%       50.00%         50.00%   50.00% 75.00% 49.00%
Fair value of real estate investment               $ 121,500           $ 116,775            
Acquisition, purchase price           11,500   39,754 91,475   24,837 31,592   35,456       3,864    
Debt Conversion, Converted Instrument, Amount                   4,522                    
Business Acquisition, Cost of Acquired Entity, Cash Paid             15,500   32,474         28,594            
Acquisition, transaction costs           672                            
Land 905,339     851,303   2,330   3,368 4,749   20,915 12,846     41,878   46,188      
Buildings and improvements 7,228,293     6,777,776   8,220   113,686 84,086   19,750 92,305     309,827   68,723      
Investments in unconsolidated affiliates 259,810     304,710       0 0     3,864     3,864          
Tenant Improvements               5,198 2,426   2,134 3,845     13,603   1,826      
Above-market leases           2,030   4,827 2,233   1,097 2,912     11,069   4,382      
In-place leases           1,570   12,121 12,489   9,282 15,629     49,521   17,591      
Total assets 7,089,736     6,719,428 7,506,554 14,150   139,200 105,983   53,178 131,401     429,762   138,710      
Business Acquisition, Purchase Price Allocation, Liabilities Assumed             (21,018) (40,368) (59,001)   (40,631) (66,924)   (66,924) (206,924) (20,944) (52,546)     (40,368)
Debt Instrument, Unamortized Discount (Premium), Net (12,830)             (2,970) (3,040)   0 (7,700)   7,700 (13,710)   (1,624)      
Business Acquisition, Purchase Price Allocation, Mortgage Notes Payable Premium, Company share                     20,315 5,775                
Below-market leases           (2,650)   (14,730) (11,468)   (3,503) (6,926)     (36,627)   (3,546)      
Partners' Capital Attributable to Noncontrolling Interest               (41,378) 0   (4,522) (14,395)     (60,295)   (65,494)      
Net assets acquired           11,500   39,754 32,474   4,522 35,456     112,206   15,500      
Total consideration in combination             36,518                 38,775        
Business combination, cash paid                               17,831        
Business Acquisition, Preexisting Relationship, Gain (Loss) Recognized             45,072                 888        
Joint Venture Partner Interest, Ownership Percentage                                       51.00%
Fixed interest, percentage rate     5.00%         5.75% 6.23%   5.87%     7.06%            
Business Acquisition, Purchase Price Allocation, Mortgage Notes Payable Premium                 3,040                      
Business Acquisition Mortgage Notes Payable Fair Value Interest Rate Assumed Percentage               4.25% 4.75%     4.75%                
Receivable with Imputed Interest, Face Amount                         $ 9,150