Quarterly report pursuant to Section 13 or 15(d)

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

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Investments in Unconsolidated Real Estate Joint Ventures (Unconsolidated Real Estate Joint Ventures) (Details)
ft² in Thousands, $ in Thousands
Sep. 30, 2020
USD ($)
ft²
Dec. 31, 2019
USD ($)
ft²
RioCan Canda [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00% 50.00%
Square Feet | ft² 765 764
Carrying Value of Investment $ 92,500 $ 94,700
Columbus, Charlotte, National Harbor and Galveston/Houston [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment Reported In Liabilities $ (45,200) $ (42,100)
Columbus [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00% 50.00%
Square Feet | ft² 355 355
Equity Method Investment Reported In Liabilities $ (3,600) $ (3,500)
Charlotte [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00% 50.00%
Square Feet | ft² 399 399
Equity Method Investment Reported In Liabilities $ (13,100) $ (13,000)
National Harbor [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00% 50.00%
Square Feet | ft² 341 341
Equity Method Investment Reported In Liabilities $ (8,700) $ (5,900)
Galveston/Houston [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00% 50.00%
Square Feet | ft² 353 353
Equity Method Investment Reported In Liabilities $ (19,800) $ (19,700)
Unconsolidated Properties [Member]    
Schedule of Equity Method Investments [Line Items]    
Total joint venture debt, net 358,940 368,032
Unconsolidated Properties [Member] | RioCan Canda [Member]    
Schedule of Equity Method Investments [Line Items]    
Total joint venture debt, net 0 9,200
Unconsolidated Properties [Member] | Columbus [Member]    
Schedule of Equity Method Investments [Line Items]    
Total joint venture debt, net 85,000 85,000
Unconsolidated Properties [Member] | Charlotte [Member]    
Schedule of Equity Method Investments [Line Items]    
Total joint venture debt, net 99,600 99,500
Unconsolidated Properties [Member] | National Harbor [Member]    
Schedule of Equity Method Investments [Line Items]    
Total joint venture debt, net 94,500 94,400
Unconsolidated Properties [Member] | Galveston/Houston [Member]    
Schedule of Equity Method Investments [Line Items]    
Total joint venture debt, net 79,900 79,900
Mortgages [Member] | Unconsolidated Properties [Member]    
Schedule of Equity Method Investments [Line Items]    
Net of debt origination costs and including premiums $ 1,100 $ 1,100