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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, 2018 USD ($) | Oct. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jan. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) investment project | Dec. 31, 2017 USD ($) investment | Dec. 31, 2018 investment | Dec. 31, 2018 unit | Dec. 31, 2018 project
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Co-investment |  |  |  |  | $ 1,300,140 | $ 1,155,984 |  |  |
Commitment to fund preferred equity investment in the project | $ 12,500 |  |  |  |  | $ 153,800 |  |  |
Number of investments with a commitment to fund | investment |  |  |  |  |  | 8 |  |  |
Annualized preferred return rate | 9.90% |  |  |  |  |  |  |  |
Equity method investment, funded amount |  |  |  |  | $ 151,800 |  |  |  |
Full redemption of a preferred equity investment |  | $ 5,000 | $ 26,500 | $ 2,400 |  |  |  |  |
Gain on early redemption of preferred equity investment |  |  | $ 1,600 |  |  |  |  |  |
Number of development projects | project |  |  |  |  | 4 |  |  |  |
Ownership interests, number of active development projects |  |  |  |  |  |  | 2 |  | 6
Number of units to be developed | unit |  |  |  |  |  |  |  | 1,861 |
Real Estate predevelopment projects [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Actual cost of active development projects |  |  |  |  | $ 800,000 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Annualized preferred return rate |  |  |  |  | 10.25% | 9.50% |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Annualized preferred return rate |  |  |  |  | 12.00% | 11.30% |  |  |
Equity Method Investments [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Commitment to fund preferred equity investment in the project |  |  |  |  | $ 45,100 |  |  |  |
Number of investments with a commitment to fund | investment |  |  |  |  | 2 |  |  |  |
Equity method investment, funded amount |  |  |  |  | $ 39,600 |  |  |  |
Total preferred interest investments [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Co-investment |  |  |  |  | $ 372,800 | $ 265,200 |  |  |

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