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Investments in Unconsolidated Real Estate Joint Ventures (Narrative) (Details)
$ in Millions
1 Months Ended
Jun. 30, 2020
USD ($)
Extension
May 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Schedule of Equity Method Investments [Line Items]      
Differences in basis $ 3.7   $ 3.8
Galveston/Houston [Member] | Mortgages [Member] | Unconsolidated Properties [Member]      
Schedule of Equity Method Investments [Line Items]      
Term of mortgage extension 6 months 1 year  
Number of mortgage extensions | Extension 2    
RioCan Canda [Member] | Unconsolidated Properties [Member]      
Schedule of Equity Method Investments [Line Items]      
Repayments of Debt   $ 8.3