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Summary of Significant Accounting Policies - Organization and Principles of Consolidation (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) retail_shopping_center TenantAccount ShoppingCenter shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) | Mar. 27, 2020 USD ($)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Unsecured public and private notes | $ 200,000 |  |  |
General Partners' Capital Account, Units Outstanding | shares | 169,680,000 | 167,571,000 |  |
Partners' Capital Account, Units | shares | 170,445,184 | 168,317,000 |  |
Tax Basis of Investments, Unrealized Appreciation (Depreciation), Net | $ 2,700,000 | $ 2,800,000 |  |
Restricted Cash and Cash Equivalent | $ 2,377 | 2,542 |  |
Cash and cash equivalents and restricted original maturity | 90 days or less |  |  |
Concentration risk, percentage | 20.00% |  |  |
Number of tenant | TenantAccount | 0 |  |  |
Number of shopping center. | ShoppingCenter | 0 |  |  |
COVID-19 [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Estimated stimulate package under CARES Act |  |  |  | $ 2,200,000,000
Parent Company [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Restricted Cash and Cash Equivalent | $ 2,400 | $ 2,500 |  |
Maximum [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Concentration risk, percentage | 5.00% |  |  |
Land Improvements [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life | 15 years |  |  |
Building and Improvements [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life | 40 years |  |  |
Tenant Improvements [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |  |
Furniture and Equipment [Member] | Minimum [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |  |
Furniture and Equipment [Member] | Maximum [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life | 7 years |  |  |
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% |  |  |
General Partners' Capital Account, Units Outstanding | shares | 169,680,138 |  |  |
Parent Company, Ownership Percentage of Outstanding Common Partnership Units of Operating Partnership | 99.60% | 99.60% |  |
Wholly Owned Properties [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Number of real estate properties | retail_shopping_center | 297 |  |  |
Unconsolidated Properties [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Number of real estate properties | retail_shopping_center | 114 |  |  |
Development And Redevelopment |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Interest costs capitalized | $ 4,400 | $ 4,200 | $ 7,000 |
Maximum Period Of Time In Which Company Capitalizes Interest Costs | 12 months |  |  |
Development [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Interest costs capitalized | $ 10,200 | $ 20,400 | $ 17,100 |

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