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Real Estate Investments - Preferred Equity Investments and Real Estate Under Development (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 USD ($) property investment project unit | Sep. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Feb. 29, 2020 USD ($) | Dec. 31, 2020 USD ($) property investment project unit | Dec. 31, 2020 USD ($) property investment project unit | Dec. 31, 2019 USD ($) investment | Dec. 31, 2018 USD ($) investment
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Co-investment | $ 1,018,010 |  |  |  | $ 1,018,010 | $ 1,018,010 | $ 1,335,339 |
Ownership interests, number of consolidated projects | project | 3 |  |  |  | 3 | 3 |  |
Ownership Interests, number of unconsolidated projects | investment | 3 |  |  |  | 3 | 3 |  |
Number of units to be developed | unit | 1,853 |  |  |  | 1,853 | 1,853 |  |
Real Estate Predevelopment Projects |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Actual cost of active development projects |  |  |  |  |  | $ 948,000 |  |
Minimum |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Annualized preferred return rate |  |  |  |  |  | 9.00% | 10.15% | 10.25%
Maximum |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Annualized preferred return rate |  |  |  |  |  | 11.50% | 11.30% | 12.00%
Equity Method Investments |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Commitment to fund preferred equity investment in the project |  |  |  |  |  | $ 191,300 | $ 141,700 | $ 45,100
Number of investments with a commitment to fund | investment |  |  |  |  |  | 7 | 5 | 2
Equity method investment, funded amount | $ 55,100 |  |  |  | $ 55,100 | $ 55,100 |  | $ 42,100
Total Preferred Interest Investments |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Co-investment | 502,300 |  |  |  | 502,300 | $ 502,300 | $ 444,900 |
Joint Venture That Holds Property In Los Angeles, CA |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Proceeds from partial redemption of co-investment |  |  | $ 11,300 |  | $ 10,700 |  |  |
Early redemption fee |  |  | $ 200 |  |  |  |  |
Preferred Equity Investment Property In Southern California |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Proceeds from partial redemption of co-investment | $ 31,300 | $ 13,400 |  | $ 13,400 |  |  |  |
Number of properties | property | 2 |  |  |  | 2 | 2 |  |

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