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Acquisitions - Narrative (Details) (USD $)
 0 Months Ended 3 Months Ended 0 Months Ended
Jan. 31, 2013
Green Acres Mall
Jan. 24, 2013
Green Acres Mall
sqft
Mar. 31, 2012
Green Acres Mall
Apr. 25, 2013
Green Acres Adjacent
acre
Oct. 24, 2013
Superstition Springs Land I
sqft
Sep. 17, 2013
Camelback Colonnade
sqft
Sep. 16, 2013
Camelback Colonnade
Acquisition              
Property area (in square feet)   1,790,000   19 1,082,000 619,000  
Purchase price   $ 500,000,000   $ 22,577,000 $ 46,162,000    
Deposits paid     30,000,000        
Purchase price, balance remaining after deposit   470,000,000          
Face amount of debt   325,000,000          
Amount of additional borrowing 225,000,000 100,000,000          
Ownership percentage             73.20%
Additional ownership interest acquired (as a percent)         33.30% 67.50%  
Purchase price funded by cash payment on acquisition         23,662,000    
Purchase price paid through assumption of debt by the Company         $ 22,500,000    
Ownership interest at completion of acquisition (as a percent)         100.00%   100.00%