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

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- Definition

Area of a real estate property.

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- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

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