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Investments in Partially Owned Entities - Consolidated Variable Interest Entities ("VIEs") - Additional Information (Details) $ in Thousands	Dec. 31, 2020 USD ($) Property ApartmentUnit	Dec. 31, 2019 USD ($)
Variable Interest Entity [Line Items]
Properties | Property	304
Apartment units | ApartmentUnit	77,889
Total assets	$ 20,286,891	$ 21,172,769
Total liabilities	$ 9,184,454	10,164,843
Consolidated VIE [Member]
Variable Interest Entity [Line Items]
Properties | Property	16
Apartment units | ApartmentUnit	3,399
Total assets	$ 784,100	754,700
Total liabilities	$ 224,000	$ 323,100

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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