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Real Estate Properties - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 30, 2021 USD ($) property | Mar. 31, 2021 USD ($) property state community | Mar. 31, 2020 USD ($)
Real Estate Properties |  |  |
Number of real estate properties |  | 396 |
Number of states in which properties are located | state |  | 36 |
Impairment of assets | $ |  | $ (174) | $ 11,234
Life Science Building |  |  |
Real Estate Properties |  |  |
Number of real estate properties |  | 1 |
Senior Living Communities | Scenario, Adjustment |  |  |
Real Estate Properties |  |  |
Number of real estate properties | community |  | 10 |
Impairment of assets | $ |  | $ (174) |
Held-for-sale |  |  |
Real Estate Properties |  |  |
Number of real estate properties |  | 4 |
Held-for-sale | Life Science and Medical Office |  |  |
Real Estate Properties |  |  |
Number of real estate properties |  | 4 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |
Real Estate Properties |  |  |
Number of real estate properties |  | 1 |
Aggregate sale price | $ |  | $ 9,000 |
Joint Venture |  |  |
Real Estate Properties |  |  |
Ownership percentage |  | 55.00% |
Subsequent Event | Silver Springs, Maryland |  |  |
Real Estate Properties |  |  |
Purchase price | $ | $ 19,600 |  |
Subsequent Event | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |
Real Estate Properties |  |  |
Aggregate sale price | $ | $ 95,500 |  |
Subsequent Event | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Life Science and Medical Office |  |  |
Real Estate Properties |  |  |
Number of real estate properties | 4 |  |

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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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