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Real Estate Investments - Sales of Real Estate Investments (Details) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2020 USD ($) apartment | Jul. 31, 2020 USD ($) apartment | Jun. 30, 2020 USD ($) apartment community | Dec. 31, 2020 USD ($) apartment community | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) community unit | Dec. 31, 2020 apartment
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of apartment units | apartment |  |  |  | 439 |  |  |
Total property revenues |  |  |  | $ 9,598 | $ 9,527 | $ 9,183 |
Apartment communities owned (in communities) |  |  |  | 246 |  |  | 2
One South Market And Museum Park |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Total property revenues |  |  | $ 232,000 |  |  |  |
Gain (loss) on sale of properties |  |  | $ 16,600 |  |  |  |
Delano, Redmond, WA |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Total property revenues |  | $ 51,500 |  |  |  |  |
Gain (loss) on sale of properties |  | $ 22,700 |  |  |  |  |
Glendale, CA |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Total property revenues | $ 60,000 |  |  |  |  |  |
Gain (loss) on sale of properties | $ 25,700 |  |  |  |  |  |
Apartment Building | One South Market And Museum Park |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of units sold | community |  |  | 2 |  |  |  |
Number of apartment units | apartment |  |  | 429 |  |  |  |
Apartment Building | Delano, Redmond, WA |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of apartment units | apartment |  | 126 |  |  |  |  |
Apartment Building | Glendale, CA |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of apartment units | apartment | 115 |  |  |  |  |  |
Communities Sold in 2019 | Santa Mateo, CA |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Gain (loss) on sale of properties |  |  |  |  | (3,200) |  |
Communities Sold in 2019 | Rental and Other Property | Santa Clara, CA |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Total property revenues |  |  |  |  | 10,800 |  |
Communities Sold in 2019 | Rental and Other Property | Santa Mateo, CA |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Total property revenues |  |  |  |  | $ 12,500 |  |
Communities Sold in 2018 |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of units sold | unit |  |  |  |  |  | 669 |
Gain (loss) on sale of properties |  |  |  |  |  | $ 61,900 |
Number of communities sold | community |  |  |  |  |  | 2 |
Communities Sold in 2018 | Rental and Other Property |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Total property revenues |  |  |  |  |  | $ 352,000 |

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