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Real Estate Investments - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2022 USD ($) investor property | Dec. 31, 2021 USD ($) | Mar. 31, 2022 USD ($) ft² state property jointVenture | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Mar. 31, 2017
Real Estate Properties |  |  |  |  |  |
Number of properties (property) | property |  |  | 378 |  |  |
Number of states in which properties are located | state |  |  | 36 |  |  |
Number of states | state |  |  | 5 |  |  |
Proceeds from sale of properties to joint venture, net |  |  | $ 643,892 | $ 0 |  |
Seaport Innovation LLC |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |
Aggregate principal amount of mortgage debt |  | $ 620,000 |  |  | $ 620,000 |
Real Estate Property Fair Value |  |  | $ 1,700,000 |  |  |
Corporate Joint Venture |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |
Number of properties (property) | property |  |  | 11 |  |  |
Area of real estate property | ft² |  |  | 2,203,242 |  |  |
Occupancy Rate |  |  | 98.00% |  |  |
Remaining lease term |  |  | 6 years 7 months 6 days |  |  |
Aggregate principal amount of mortgage debt | $ 456,600 |  |  |  |  |
Real Estate Property Fair Value | 702,500 |  |  |  |  |
Seaport Innovation LLC | Corporate Joint Venture |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |
Number of properties (property) | property |  |  | 1 |  |  |
Equity method investment ownership percentage |  | 20.00% | 20.00% |  | 20.00% | 55.00%
Area of real estate property | ft² |  |  | 1,134,479 |  |  |
Additional equity joint venture percentage |  | 35.00% |  |  | 35.00% |
Proceeds from sale of properties to joint venture, net |  | $ 373,847 |  |  |  |
Senior Living Communities | Skilled nursing bed license |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |
Gain on sale of properties | $ 327,542 |  |  |  |  |
Medical Office Building and Life Science Building | Corporate Joint Venture |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |
Equity method investment ownership percentage | 20.00% |  |  |  |  |
Number of properties included in joint venture agreement | property | 10 |  |  |  |  |
Proceeds from sale of properties to joint venture, net | $ 653,300 |  |  |  |  |
Number of third party institutional investors | investor | 2 |  |  |  |  |
Medical Office Building and Life Science Building | Corporate Joint Venture | Unrelated Investor One |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |
Equity method investment ownership percentage | 41.00% |  |  |  |  |
Medical Office Building and Life Science Building | Corporate Joint Venture | Unrelated Investor Two |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |
Equity method investment ownership percentage | 39.00% |  |  |  |  |
Joint Venture |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |
Equity method investment ownership percentage |  |  | 20.00% |  |  |
Number of unconsolidated joint ventures | jointVenture |  |  | 2 |  |  |

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