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Investments in Partially Owned Entities - Consolidated Variable Interest Entities ("VIEs") - Additional Information (Details) $ in Thousands | Dec. 31, 2018 USD ($) Property ApartmentUnit | Dec. 31, 2017 USD ($)
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Properties | Property | 307 |
Apartment units | ApartmentUnit | 79,482 |
Total assets | $ 20,394,209 | $ 20,570,599
Total liabilities | $ 9,615,454 | 9,729,781
Consolidated VIE [Member] |  |
Variable Interest Entity [Line Items] |  |
Properties | Property | 17 |
Apartment units | ApartmentUnit | 3,535 |
Total assets | $ 713,600 | 518,900
Total liabilities | $ 313,900 | $ 307,000

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