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Organization and Significant Accounting Policies - Organization and Principles of Consolidation (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2020 USD ($) retail_shopping_center
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
Unsecured public and private notes | $ | $ 200
Operating Partnership [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
Ownership percentage of outstanding common partnership units | 99.60%
COVID-19 [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
Percentage of Operating Centers | 80.00%
Percentage of Base Rent Collected from Tenants | 86.00%
Number of Rent Deferrals | 1,300
Wholly Owned Properties [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
Number of real estate properties | 299
Unconsolidated Properties [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
Number of real estate properties | 115

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