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Fair Value of Assets and Liabilities - Assets and Liabilities (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Feb. 02, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Mar. 31, 2017
AlerisLife Inc |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |
Investment owned balance per shares (in dollars per share) | $ 1.31 |  |  |  |  |
Corporate Joint Venture | Seaport Innovation LLC |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |
Equity method investment ownership percentage |  | 10.00% |  | 20.00% | 20.00% | 55.00%
Holding period |  | 10 years |  |  |  |
Corporate Joint Venture | Seaport Innovation LLC | Discount Rate |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |
Measurement input |  | 0.0800 |  |  |  |
Corporate Joint Venture | Seaport Innovation LLC | Market Capitalization Rate |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |
Measurement input |  | 0.0600 |  |  |  |
Corporate Joint Venture | The LSMD Fund REIT LLC |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |
Equity method investment ownership percentage |  | 20.00% |  |  |  |
Holding period |  | 10 years |  |  |  |
Corporate Joint Venture | The LSMD Fund REIT LLC | Discount Rate | Minimum |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |
Measurement input |  | 0.0625 |  |  |  |
Corporate Joint Venture | The LSMD Fund REIT LLC | Discount Rate | Maximum |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |
Measurement input |  | 0.0800 |  |  |  |
Corporate Joint Venture | The LSMD Fund REIT LLC | Market Capitalization Rate | Minimum |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |
Measurement input |  | 0.0475 |  |  |  |
Corporate Joint Venture | The LSMD Fund REIT LLC | Market Capitalization Rate | Maximum |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |
Measurement input |  | 0.0700 |  |  |  |
Recurring | Level 1 | Carrying Amount | AlerisLife Inc |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |
Investments in affiliates, fair value |  | $ 0 | $ 5,880 |  |  |
Investment in common shares (in shares) |  | 10,691,658 |  |  |  |
Realized gain |  | $ 8,126 |  |  |  |
Unrealized loss |  |  | 25,660 |  |  |
Recurring | Level 1 | Estimated Fair Value | AlerisLife Inc |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |
Investments in affiliates, fair value |  | 0 | 5,880 |  |  |
Recurring | Joint Venture | Level 3 | Carrying Amount | Seaport Innovation LLC |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |
Investments in affiliates, fair value |  | 85,699 | 104,697 |  |  |
Recurring | Joint Venture | Level 3 | Carrying Amount | The LSMD Fund REIT LLC |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |
Investments in affiliates, fair value |  | 44,217 | 50,780 |  |  |
Recurring | Joint Venture | Level 3 | Estimated Fair Value | Seaport Innovation LLC |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |
Investments in affiliates, fair value |  | 85,699 | 104,697 |  |  |
Recurring | Joint Venture | Level 3 | Estimated Fair Value | The LSMD Fund REIT LLC |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |
Investments in affiliates, fair value |  | $ 44,217 | $ 50,780 |  |  |

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