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Real Estate Investments - Development Co-Investments (Details) $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) 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 |  | $ 1,119,258 | $ 1,300,140 |
Number of units to be developed | unit |  |  | 1,861 |
Commitment to fund preferred equity investment in the project | $ 12,500 | $ 153,800 |  |
Annualized preferred return rate | 9.90% |  |  |
Total development co investments [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of apartments owned through joint ventures | unit |  | 814 | 814 |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures |  | $ 73,770 | $ 94,060 |
Ohlone Multi-family Community [Member] |  |  |  |
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 [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of units to be developed | unit |  |  |  | 545
Equity method investment, ownership percentage |  |  |  | 50.00%
Estimated cost active development projects |  |  |  | $ 415,000

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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