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Acquisitions and Discontinued Operations Acquisitions (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Jun. 30, 2013
Outlet Shoppes at El Paso [Member]
Apr. 08, 2013
Kirkwood Mall [Member]
Mar. 31, 2013
Kirkwood Mall [Member]
Jun. 30, 2013
Outlet Shoppes at Gettysburg [Member]
Dec. 31, 2012
Imperial Valley Mall [Member]
Dec. 31, 2012
Purchase Price Allocation Preliminary Estimate [Member]
Acquisitions [Member]
Dec. 31, 2012
Purchase Price Allocation Adjustments [Member]
Acquisitions [Member]
Dec. 31, 2012
Purchase Price Allocation Final [Domain]
Acquisitions [Member]
Business Acquisition [Line Items]                      
Percentage of Equity Interest in Real Estate Property       75.00%   49.00% 50.00%        
Business Acquisition, Percentage of Voting Interests Acquired         51.00%     40.00%      
Land $ 909,585 $ 905,339             $ 88,066 $ (197) [1] $ 87,869
Buildings and improvements 7,237,585 7,228,293             378,550 1,213 [1] 379,763
Investments in unconsolidated affiliates 282,389 259,810             3,864   3,864
Tenant Improvements                 15,429 (101) [1] 15,328
Above-market leases                 15,451 (92) [1] 15,359
In-place leases                 67,112 (1,298) [1] 65,814
Total assets 7,034,643 7,089,736 6,913,611           568,472 (475) [1] 567,997
Mortgage note payables assumed                 (259,470)   (259,470)
Debt premium 11,767               (15,334)   (15,334)
Below-market leases                 (40,173) 475 [1] (39,698)
Noncontrolling interests 165,793 192,404             (60,295)   (60,295)
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value                 (65,494)    
Net assets acquired                 $ 127,706   $ 127,706
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