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Summary of Significant Accounting Policies Schedule of Variable Interest Entities (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) retail_shopping_center | Dec. 31, 2019 USD ($)
Variable Interest Entity [Line Items] |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets |  | $ 10,936,904 | $ 11,132,253
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities |  | 4,878,757 | 4,842,292
Noncontrolling Interest in Variable Interest Entity |  | 28,685 | 30,655
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities |  | 6,340 | 17,740
Real Estate [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | [1] | 127,240 | 325,464
Cash and Cash Equivalents [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | [1] | $ 4,496 | $ 57,269
Minimum [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Expected useful lives of the properties and other intangible assets |  | 10 years |
Maximum [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Expected useful lives of the properties and other intangible assets |  | 40 years |
Partially Owned Properties [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Number of real estate properties | retail_shopping_center |  | 124 |
Consolidated Properties [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Number of real estate properties | retail_shopping_center |  | 10 |
[1] | Included in the December 31, 2019 balances were real estate assets and cash held in Section 1031 like-kind exchanges, of which none remained at December 31, 2020.

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