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Organization and Significant Accounting Policies - Schedule of Variable Interest Entities (Details) $ in Thousands | Mar. 31, 2021 USD ($) retail_shopping_center | Dec. 31, 2020 USD ($)
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | $ 10,625,988 | $ 10,936,904
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities | 4,582,944 | 4,878,757
Noncontrolling Interest in Variable Interest Entity | 28,534 | 28,685
Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities | 6,349 | 6,340
Real Estate [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | 127,513 | 127,240
Cash and Cash Equivalents [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | $ 4,793 | $ 4,496
Partially Owned Properties [Member] |  |
Variable Interest Entity [Line Items] |  |
Number of real estate properties | retail_shopping_center | 123 |
Consolidated Properties [Member] |  |
Variable Interest Entity [Line Items] |  |
Number of real estate properties | retail_shopping_center | 10 |

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