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Organization (Details)
ft² in Millions
6 Months Ended
Jun. 30, 2019
ft²
joint_venture
property
Jun. 30, 2018
ft²
joint_venture
property
Entity Information [Line Items]    
Number of operating real estate joint ventures | joint_venture 1  
Corporate Joint Venture    
Entity Information [Line Items]    
Number of retail properties | joint_venture   1
Area of real estate | ft² 2.6 3.0
Number of managed assets | property 12 14
Retail    
Entity Information [Line Items]    
Area of real estate | ft² 9.5 11.0
Retail    
Entity Information [Line Items]    
Number of retail properties | property 59 64