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Real Estate Investments - Preferred Equity Investments and Real Estate Under Development (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2019 USD ($) | Oct. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Apr. 30, 2019 USD ($) | Feb. 28, 2019 USD ($) | Dec. 31, 2019 USD ($) investment unit project | Dec. 31, 2018 USD ($) investment
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Co-investment |  |  |  |  |  | $ 1,335,339 | $ 1,300,140
Ownership interests, number of consolidated projects | project |  |  |  |  |  | 5 |
Ownership Interests, number of unconsolidated projects | investment |  |  |  |  |  | 2 |
Number of units to be developed | unit |  |  |  |  |  | 1,960 |
Real Estate Predevelopment Projects |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Actual cost of active development projects |  |  |  |  |  | $ 1,000,000 |
Minimum |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Annualized preferred return rate |  |  |  |  |  | 10.15% | 10.25%
Maximum |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Annualized preferred return rate |  |  |  |  |  | 11.30% | 12.00%
Equity Method Investments |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Commitment to fund preferred equity investment in the project |  |  |  |  |  | $ 141,700 | $ 45,100
Number of investments with a commitment to fund | investment |  |  |  |  |  | 5 | 2
Equity method investment, funded amount |  |  |  |  |  | $ 125,400 | $ 41,100
Total Preferred Interest Investments |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Co-investment |  |  |  |  |  | $ 444,900 | $ 372,800
Joint Venture that Holds Property San Jose, CA |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Full redemption of a preferred equity investment |  |  |  |  | $ 10,900 |  |
Early redemption fee |  |  |  |  | $ 100 |  |
Joint Venture that Holds Property in Santa Ana, California |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Full redemption of a preferred equity investment |  |  |  | $ 16,300 |  |  |
Early redemption fee |  |  |  | $ 700 |  |  |
Redmond, WA |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Full redemption of a preferred equity investment |  |  | $ 14,800 |  |  |  |
Early redemption fee |  |  | 300 |  |  |  |
Seattle, WA |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Full redemption of a preferred equity investment |  |  | 16,300 |  |  |  |
Early redemption fee |  |  | $ 1,400 |  |  |  |
San Jose, CA |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Full redemption of a preferred equity investment |  | $ 15,800 |  |  |  |  |
Early redemption fee |  | $ 200 |  |  |  |  |
Bellevue, WA |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Full redemption of a preferred equity investment | $ 16,000 |  |  |  |  |  |
Early redemption fee | $ 900 |  |  |  |  |  |

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