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, 2021
USD ($)
ft²
Dec. 31, 2020
USD ($)
ft²
Columbus and RioCan Canada    
Schedule of Equity Method Investments [Line Items]    
Carrying Value of Investment $ 85,400 $ 94,600
Columbus [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00% 50.00%
Square feet | ft² 355 355
Carrying Value of Investment $ 1,100 $ 2,000
RioCan Canda [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00% 50.00%
Square feet | ft² 665 765
Carrying Value of Investment $ 84,300 $ 92,600
Charlotte, National Harbor and Galveston/Houston    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment Reported In Liabilities $ (40,600) $ (40,700)
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 $ (16,800) $ (12,800)
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 $ (10,100) $ (8,400)
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 $ (13,700) $ (19,500)
Unconsolidated Properties [Member]    
Schedule of Equity Method Investments [Line Items]    
Total Joint Venture Debt, Net 329,381 344,856
Unconsolidated Properties [Member] | Columbus [Member]    
Schedule of Equity Method Investments [Line Items]    
Total Joint Venture Debt, Net 70,900 70,800
Unconsolidated Properties [Member] | RioCan Canda [Member]    
Schedule of Equity Method Investments [Line Items]    
Total Joint Venture Debt, Net 0 0
Unconsolidated Properties [Member] | Charlotte [Member]    
Schedule of Equity Method Investments [Line Items]    
Total Joint Venture Debt, Net 99,600 99,600
Unconsolidated Properties [Member] | National Harbor [Member]    
Schedule of Equity Method Investments [Line Items]    
Total Joint Venture Debt, Net 94,500 94,500
Unconsolidated Properties [Member] | Galveston/Houston [Member]    
Schedule of Equity Method Investments [Line Items]    
Total Joint Venture Debt, Net 64,400 80,000
Mortgages [Member] | Unconsolidated Properties [Member]    
Schedule of Equity Method Investments [Line Items]    
Net debt origination costs $ 1,100 $ 1,100