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Indebtedness - Narrative (Details) |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 21, 2023 USD ($) | Dec. 31, 2023 USD ($) property | Apr. 30, 2023 USD ($) property | Feb. 28, 2023 USD ($) | Jan. 31, 2023 USD ($) | Oct. 31, 2022 USD ($) property | Jul. 31, 2022 USD ($) property | Jun. 30, 2022 | Apr. 30, 2022 USD ($) property | Feb. 28, 2022 USD ($) | Feb. 28, 2021 USD ($) | Feb. 07, 2021 | Dec. 31, 2023 USD ($) property | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2023 USD ($) | Jan. 31, 2022 USD ($) | Jun. 30, 2021 USD ($)
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of borrowings on revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000,000 | $ 100,000,000 | $ 0 |  |  |
Loss on modification or early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  | 2,468,000 | 30,043,000 | 2,410,000 |  |  |
Accrued interest |  | $ 22,847,000 |  |  |  |  |  |  |  |  |  |  | $ 22,847,000 | 29,417,000 |  |  |  |
Number of properties owned (property) | property |  | 371 |  |  |  |  |  |  |  |  |  |  | 371 |  |  |  |  |
Redemption of senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000 | 500,000,000 | $ 300,000,000 |  |  |
Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties owned (property) | property |  | 2 |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Unsecured Debt, Not Guaranteed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  | $ 1,100,000,000 |  |  |  |  |  |  |  |  |  |  | $ 1,100,000,000 |  |  |  |  |
Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  | 2,100,000,000 |  |  |  |  |  |  |  |  |  |  | 2,100,000,000 | $ 2,350,000,000 |  |  |  |
Credit Facility | Unsecured debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility, maximum borrowing capacity |  | $ 450,000,000 |  | $ 450,000,000 | $ 586,373,000 |  |  |  |  | $ 700,000,000 |  |  | $ 450,000,000 |  |  |  | $ 800,000,000 |
Credit facility, interest rate payable (as a percent) |  | 8.40% |  |  |  |  |  |  |  |  |  |  | 8.40% |  |  |  |  |
Facility fee |  |  |  |  |  |  |  |  |  |  |  |  | $ 338,000 |  |  |  |  |
Weighted average interest rate on debt (as a percent) |  | 7.90% |  |  |  |  |  |  |  |  |  |  | 7.90% | 4.50% | 2.90% |  |  |
Repayments of borrowings on revolving credit facility | $ 450,000,000 | $ 450,000,000 |  | 136,373,000 | $ 113,627,000 |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |
Loss on modification or early extinguishment of debt |  | 314,000 |  | $ 1,075,000 |  |  |  |  |  |  |  |  | $ (1,389,000) |  |  |  |  |
Senior Secured Notes Due January 2026 | Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt | 940,534,000 | $ 940,534,000 |  |  |  |  |  |  |  |  |  |  | $ 940,534,000 |  |  |  |  |
Interest rate (as a percent) |  | 0.00% |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |
Proceeds from debt | 730,359,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest in each collateral guarantee |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |
Accreted value increase rate |  | 11.25% |  |  |  |  |  |  |  |  |  |  | 11.25% |  |  |  |  |
Senior unsecured notes due 2025 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |
Interest rate (as a percent) |  | 9.75% |  |  |  |  |  |  |  |  |  |  | 9.75% |  |  |  |  |
Senior unsecured notes due 2025 | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 | $ 500,000,000 |  |  |  |
Interest rate (as a percent) |  | 9.75% |  |  |  |  |  |  |  |  |  |  | 9.75% |  |  |  |  |
Senior unsecured notes due 2031 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |
Interest rate (as a percent) |  | 4.375% |  |  |  |  |  |  |  |  |  |  | 4.375% |  |  |  |  |
Senior unsecured notes due 2031 | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 | 500,000,000 |  |  |  |
Interest rate (as a percent) |  | 4.375% |  |  |  |  |  |  |  |  |  |  | 4.375% |  |  |  |  |
Senior Note 4.375 Due 2031 | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 4.375% |  |  |  |  |  |  |
Proceeds from debt |  |  |  |  |  |  |  |  |  |  | $ 491,357,000 |  |  |  |  |  |  |
Term loan due 2022 | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |
Loss on modification or early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,477,000 |  |  |
Debt instrument, interest rate during period |  |  |  |  |  |  |  |  |  |  |  | 2.90% |  |  |  |  |  |
Senior Unsecured Notes Due June 2021 | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.75%
Loss on modification or early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 370,000 |  |  |
Accrued interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,125,000
Mortgage notes 6.28% maturing July 2022 | Medical Office |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 6.28% |  |  |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  | $ 10,934,000 |  |  |  |  |  |  |  |  |
Mortgage notes 6.28% maturing July 2022 | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 5.75% |  |  |  |  |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  | $ 15,273,000 |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Note Due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.75% |  |
Loss on modification or early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,576,000 |  |  |  |
Accrued interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,083,000 |  |
Debt instrument, amount redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |
Redemption price (as a percent) |  |  |  |  |  |  |  | 104.875% |  |  |  |  |  |  |  |  |  |
Mortgages 4.85 Percent Matured In October 2022 | Life Science |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 4.85% |  |  |  |  |  |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | $ 10,287,000 |  |  |  |  |  |  |  |  |  |  |  |
Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 6.64% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties owned (property) | property |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 14,565,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, 4.750% coupon rate, due 2024 | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  | $ 0 |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 250,000,000 |  |  |  |
Interest rate (as a percent) |  | 4.75% |  |  |  |  |  |  |  |  |  |  | 4.75% |  |  |  |  |
Loss on modification or early extinguishment of debt |  | $ 1,079,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of senior unsecured notes | $ 250,000,000 | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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