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
Jun. 30, 2019
USD ($)
ft²
Dec. 31, 2018
USD ($)
ft²
RioCan Canda [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00% 50.00%
Square Feet | ft² 762 924
Carrying Value of Investment $ 96,300 $ 96,000
Columbus, Charlotte, National Harbor and Galveston/Houston [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment Reported In Liabilities $ (39,500) $ (32,500)
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 $ (2,300) $ (1,600)
Charlotte [Member]    
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00% 50.00%
Square Feet | ft² 399 398
Equity Method Investment Reported In Liabilities $ (11,500) $ (10,800)
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 $ (5,200) $ (5,100)
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 $ (20,500) $ (15,000)
Unconsolidated Properties [Member]    
Schedule of Equity Method Investments [Line Items]    
Total joint venture debt, net 368,072 367,865
Unconsolidated Properties [Member] | RioCan Canda [Member]    
Schedule of Equity Method Investments [Line Items]    
Total joint venture debt, net 9,500 9,300
Unconsolidated Properties [Member] | Columbus [Member]    
Schedule of Equity Method Investments [Line Items]    
Total joint venture debt, net 84,900 84,700
Unconsolidated Properties [Member] | Charlotte [Member]    
Schedule of Equity Method Investments [Line Items]    
Total joint venture debt, net 99,500 99,500
Unconsolidated Properties [Member] | National Harbor [Member]    
Schedule of Equity Method Investments [Line Items]    
Total joint venture debt, net 94,400 94,500
Unconsolidated Properties [Member] | Galveston/Houston [Member]    
Schedule of Equity Method Investments [Line Items]    
Total joint venture debt, net 79,700 79,600
Mortgages [Member] | Unconsolidated Properties [Member]    
Schedule of Equity Method Investments [Line Items]    
Net discount and debt origination costs $ 1,300 $ 1,400