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Acquisitions - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 19, 2016
Feb. 17, 2015
Oct. 31, 2014
Dec. 31, 2016
Acquisition        
Contingent settlement payment       $ (12,180)
Fashion Outlets of Chicago | Joint venture        
Acquisition        
Purchase price     $ 69,987  
Contingent settlement payment $ 23,800      
Inland Center        
Acquisition        
Purchase price   $ 51,250    
Additional ownership interest (as a percent)   50.00%    
Purchase price funded by cash payment on acquisition   $ 26,250    
Acquisition of properties by assumption of mortgage note payable and other accrued liabilities   $ 25,000    
Ownership percentage at completion of acquisition (as a percent)   100.00%