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Acquisitions - Narrative (Details) (USD $)
0 Months Ended 12 Months Ended 0 Months Ended 0 Months Ended 1 Months Ended
Jan. 31, 2013
Green Acres Mall
Jan. 24, 2013
Green Acres Mall
sqft
Dec. 31, 2012
Green Acres Mall
Apr. 25, 2013
Green Acres Adjacent
acre
Oct. 24, 2013
Superstition Springs Land I
Oct. 24, 2013
Superstition Springs Land I
sqft
Jun. 04, 2014
Cascade Mall
Jun. 30, 2014
Cascade Mall
Jun. 04, 2014
Cascade Mall
sqft
Jun. 03, 2014
Cascade Mall
Sep. 17, 2013
Camelback Colonnade
sqft
Sep. 16, 2013
Camelback Colonnade
Acquisition                        
Property area (in square feet)   1,793,000   19   1,082,000     593,000   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%     49.00%   67.50%  
Purchase price funded by cash payment on acquisition         23,662,000   15,233,000          
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%   100.00%
Incremental revenue               617,000        
Incremental earnings               $ 202,000