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Acquisitions - Level 3 Assumptions Utilized in Determining Value of Acquired Assets (Details) - Valuation, Income Approach - $ / ft² | 12 Months Ended
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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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