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Acquisitions - Level 3 Assumptions Utilized in Determining Value of Acquired Assets (Details) - Valuation, Income Approach - $ / ft²	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Net rental rate per square foot - Anchors | 2020 Operating Property Acquisitions | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net rental rate per square foot (in dollars per share)	22.50
Net rental rate per square foot - Anchors | 2020 Operating Property Acquisitions | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net rental rate per square foot (in dollars per share)	27.50
Net rental rate per square foot - Anchors | 2019 Operating Property Acquisitions | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net rental rate per square foot (in dollars per share)		11.00
Net rental rate per square foot - Anchors | 2019 Operating Property Acquisitions | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net rental rate per square foot (in dollars per share)		12.96
Net rental rate per square foot - Small Shops | 2020 Operating Property Acquisitions | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net rental rate per square foot (in dollars per share)	15.00
Net rental rate per square foot - Small Shops | 2020 Operating Property Acquisitions | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net rental rate per square foot (in dollars per share)	65.00
Net rental rate per square foot - Small Shops | 2019 Operating Property Acquisitions | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net rental rate per square foot (in dollars per share)		6.33
Net rental rate per square foot - Small Shops | 2019 Operating Property Acquisitions | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net rental rate per square foot (in dollars per share)		32.00
Discount rate | 2020 Operating Property Acquisitions | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net rental rate per square foot (in dollars per share)	0.090
Discount rate | 2020 Operating Property Acquisitions | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net rental rate per square foot (in dollars per share)	0.090
Discount rate | 2019 Operating Property Acquisitions | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net rental rate per square foot (in dollars per share)		0.090
Discount rate | 2019 Operating Property Acquisitions | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net rental rate per square foot (in dollars per share)		0.090

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