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Interim Financial Statements (Details)
Mar. 31, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]    
Number of urban and suburban shopping centers in the Company's owned portfolio 24  
Number of states in which Company operates 11  
Westfarms [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage (in hundredths) 79.00% 79.00%
International Plaza [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage (in hundredths) 50.10% 50.10%