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Acquisitions - Narrative (Details) (USD $)
 9 Months Ended 0 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 0 Months Ended 4 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Jul. 22, 2011
Fashion Outlets of Niagara
sqft
Sep. 30, 2014
Fashion Outlets of Niagara
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
Sep. 30, 2014
Cascade Mall
Jun. 04, 2014
Cascade Mall
sqft
Jun. 03, 2014
Cascade Mall
Oct. 24, 2013
Cascade Mall
Sep. 17, 2013
Camelback Colonnade
sqft
Sep. 16, 2013
Camelback Colonnade
Acquisition                                  
Property area (in square feet)     517,000     1,791,000   19   1,082,000     593,000     619,000  
Contingent consideration       $ 18,667,000                          
Purchase price     200,000,000     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 0 109,858,000             22,500,000                
Ownership interest at completion of acquisition (as a percent)                   100.00%       100.00% 100.00%   100.00%
Incremental revenue                       2,337,000          
Incremental earnings                       $ 667,000