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Real Estate Investments - Operating, Pre-Development, and Development Co-Investments (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) unit | Dec. 31, 2017 USD ($) unit | Dec. 31, 2019 USD ($) unit | Dec. 31, 2015 USD ($) unit
Real Estate Properties [Line Items] |  |  |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures | $ 1,018,010 |  | $ 1,335,339 |
Number of units to be developed | unit | 1,853 |  |  |
Total Operating Co-investments |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of apartments owned through joint ventures | unit | 8,652 |  | 10,672 |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures | $ 358,266 |  | $ 743,461 |
Total Development Co-Investments |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of apartments owned through joint ventures | unit | 1,070 |  | 806 |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures | $ 157,433 |  | $ 146,944 |
Mesa Village |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of units to be developed | unit | 264 |  |  |
Equity method investment, ownership percentage | 51.00% |  |  |
Estimated cost active development projects | $ 102,000 |  |  |
Purchase commitment, funded amount | $ 5,900 |  |  |
Annualized preferred return rate | 10.00% |  |  |
Ohlone Multi-Family Community |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of units to be developed | unit |  | 269 |  |
Equity method investment, ownership percentage |  | 50.00% |  |
Estimated cost active development projects |  | $ 148,000 |  |
Purchase commitment, funded amount |  | $ 28,900 |  |
Annualized preferred return rate |  | 10.00% |  |
Folsom 500 |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of units to be developed | unit |  |  |  | 537
Equity method investment, ownership percentage |  |  |  | 50.00%
Estimated cost active development projects |  |  |  | $ 415,000

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