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Real Estate Investments - Narrative (Details) $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 28, 2023 USD ($) property | Jun. 30, 2022 USD ($) | Jan. 31, 2022 USD ($) investor | Dec. 31, 2021 USD ($) ft² property building | Jan. 31, 2020 USD ($) | Dec. 31, 2022 USD ($) ft² property unit | Dec. 31, 2021 USD ($) ft² property building | Dec. 31, 2020 USD ($) property building | Jun. 28, 2022 | Mar. 31, 2017
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Real estate investment properties, net |  |  |  | $ 5,075,749 |  | $ 4,864,191 | $ 5,075,749 |  |  |
Buildings and improvements |  |  |  | 6,072,055 |  | 6,023,625 | 6,072,055 |  |  |
Land |  |  |  | 741,501 |  | 668,918 | 741,501 |  |  |
Real estate property - accumulated depreciation |  |  |  | 1,737,807 |  | $ 1,828,352 | 1,737,807 |  |  |
Number of properties owned (property) | property |  |  |  |  |  | 379 |  |  |  |
Proceeds from sale of interest in joint venture, net |  |  |  |  |  | $ 108,424 | 367,033 | $ 0 |  |
Gain (loss) on sale of properties |  |  |  |  |  | 321,862 | 492,272 | 6,487 |  |
Impairment of assets |  |  |  |  |  | 0 | (174) | 106,972 |  |
Lease committed but unspent tenant related obligations |  |  |  |  |  | 39,314 | 76,573 |  |  |
Hurricane damage, loss and deductible amount |  |  |  |  |  | 11,253 |  |  |  |
Hurricane damage, loss |  |  |  |  |  | 7,635 |  |  |  |
Proceeds from insurance recoveries |  |  |  |  |  | 14,466 | 0 | $ 0 |  |
Hurricane damage, loss recovered |  |  |  |  |  | 7,635 |  |  |  |
Hurricane damage, deductible amount |  |  |  |  |  | 3,618 |  |  |  |
Hurricane damage, insurance proceeds in excess of loss, liability |  |  |  |  |  | 3,213 |  |  |  |
Seaport Innovation LLC |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Aggregate property valuation amount |  |  |  | 1,700,000 |  |  | 1,700,000 |  |  |
Aggregate principal amount of mortgage debt |  |  |  | 620,000 |  |  | 620,000 |  |  |
Building |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Real estate property - accumulated depreciation |  |  |  | 1,587,573 |  | 1,640,094 | 1,587,573 |  |  |
Building Improvements |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Real estate property - accumulated depreciation |  |  |  | $ 150,234 |  | $ 188,258 | $ 150,234 |  |  |
Senior Living Communities |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  |  |  |  |  | 28 |  |
Number of units in real estate property | unit |  |  |  |  |  | 27,408 |  |  |  |
Impairment of assets |  |  |  |  |  |  |  | $ 98,414 |  |
Medical Office Building |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  |  |  |  |  | 7 |  |
Impairment of assets |  |  |  |  |  |  |  | $ 8,558 |  |
Welness Centers |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  |  |  | 10 |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  |  |  | 812,000 |  |  |  |
Medical Office Building and Life Science Building |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  |  |  | 105 |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  |  |  | 8,800,000 |  |  |  |
Medical Office Building and Life Science Building | Capital Commitments |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  | 2,600,000 |  | 900,000 | 2,600,000 |  |  |
Leases committed expenditure |  |  |  |  |  | $ 22,911 | $ 97,520 |  |  |
Medical Office Building and Life Science Building | Skilled Nursing Bed License |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of properties |  |  | $ 322,468 |  |  |  |  |  |  |
Senior Living Communities, Independent Living, Assisted Living, and Skilled Nursing Facility |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  |  |  | 264 |  |  |  |
Senior Living Communities | Skilled Nursing Bed License |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of properties |  |  |  | $ (461,434) |  | $ (1,428) |  |  |  |
Life Science Property | Arizona |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Real estate purchase price |  |  |  |  | $ 2,600 |  |  |  |  |
Joint Venture |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  |  |  | 11 |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  |  |  | 2,203,242 |  |  |  |
Aggregate property valuation amount |  |  | 702,500 |  |  |  |  |  |  |
Aggregate principal amount of mortgage debt |  |  | 456,600 |  |  |  |  |  |  |
Joint Venture | Seaport Innovation LLC |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  |  |  | 1 |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  |  |  | 1,134,479 |  |  |  |
Equity method investment ownership percentage |  | 20.00% |  | 20.00% |  | 10.00% | 20.00% |  | 20.00% | 55.00%
Additional equity joint venture percentage |  | 10.00% |  | 35.00% |  |  |  |  |  |
Proceeds from sale of interest in joint venture, net |  | $ 108 |  | $ 378 |  |  |  |  |  |
Joint Venture | Investor | Seaport Innovation LLC |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Equity method investment ownership percentage |  |  |  |  |  |  |  |  |  | 45.00%
Joint Venture | Medical Office Building and Life Science Building |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Proceeds from sale of interest in joint venture, net |  |  | $ 653,300 |  |  |  |  |  |  |
Number of third party institutional investors | investor |  |  | 2 |  |  |  |  |  |  |
Joint Venture | Medical Office Building and Life Science Building | Seaport Innovation LLC |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Equity method investment ownership percentage |  | 10.00% |  |  |  |  |  |  |  |
Joint Venture | Medical Office Building and Life Science Building | Diversified Healthcare Trusts |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Equity method investment ownership percentage |  |  | 20.00% |  |  |  |  |  |  |
Joint Venture | Medical Office Building and Life Science Building | Unrelated Investor One | Diversified Healthcare Trusts |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Equity method investment ownership percentage |  |  | 41.00% |  |  |  |  |  |  |
Joint Venture | Medical Office Building and Life Science Building | Unrelated Investor Two | Diversified Healthcare Trusts |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Equity method investment ownership percentage |  |  | 39.00% |  |  |  |  |  |  |
Scenario, Adjustment | Senior Living Communities |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  | 10 |  |  | 10 |  |  |
Impairment of assets |  |  |  |  |  |  | $ (174) |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Subsequent Event |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Sale price of property sold and agreed to be sold | $ 2,800 |  |  |  |  |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Senior Living Communities |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  |  |  |  |  | 10 |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Medical Office Building |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  |  |  |  |  | 1 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of properties owned (property) | building |  |  |  | 5 |  |  | 5 | 27 |  |
Sale price of property sold and agreed to be sold |  |  |  |  |  |  | $ 104,500 | $ 152,893 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Senior Living Communities |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  |  |  |  |  | 9 |  |
Number of real estate properties closed | property |  |  |  |  |  |  |  | 7 |  |
Number of real estate properties held for sale | property |  |  |  |  |  | 1 |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Senior Living Communities | Subsequent Event |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of real estate properties closed | property | 3 |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Medical Office Building |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  |  |  |  |  | 4 |  |

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