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Investments in Partially Owned Entities - Consolidated Variable Interest Entities ("VIEs") - Additional Information (Details) $ in Thousands | Mar. 31, 2021 USD ($) Property ApartmentUnit | Dec. 31, 2020 USD ($)
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Properties | Property | 304 |
Apartment units | ApartmentUnit | 77,889 |
Total assets | $ 20,169,015 | $ 20,286,891
Total liabilities | $ 9,207,251 | 9,184,454
Consolidated VIE [Member] |  |
Variable Interest Entity [Line Items] |  |
Properties | Property | 16 |
Apartment units | ApartmentUnit | 3,399 |
Total assets | $ 780,900 | 784,100
Total liabilities | $ 237,800 | $ 224,000

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