Quarterly report pursuant to Section 13 or 15(d)

Investments in Unconsolidated Real Estate Joint Ventures (Narrative) (Details)

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Investments in Unconsolidated Real Estate Joint Ventures (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]          
Differences in basis $ 3,700   $ 3,700   $ 3,700
Unconsolidated Properties [Member]          
Schedule of Equity Method Investments [Line Items]          
Joint Ventures Impairment loss 18,042 $ 5,838 $ 18,042 $ 5,838  
Unconsolidated Properties [Member] | RioCan Canda [Member]          
Schedule of Equity Method Investments [Line Items]          
Joint Ventures Impairment loss 18,000        
Our Share of Impairment Losses Related to Real Estate Partnerships $ 9,000