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Real Estate Investments - Development Co-Investments (Details) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) unit | Dec. 31, 2019 USD ($) unit | Dec. 31, 2018 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 |  | $ 1,335,339 | $ 1,300,140 |
Number of units to be developed | unit |  | 1,960 |  |
Total Operating Co-investments |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of apartments owned through joint ventures | unit |  | 10,672 | 10,613 |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures |  | $ 743,461 | $ 833,270 |
Total Development Co-Investments |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of apartments owned through joint ventures | unit |  | 806 | 814 |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures |  | $ 146,944 | $ 94,060 |
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 | $ 136,000 |  |  |
Commitment to fund preferred equity investment in the project | $ 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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