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Fair Value of Assets and Liabilities - Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2022 | Jun. 28, 2022 | Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Unrealized loss on equity securities, net | $ (25,660) |  |  |  |
AlerisLife Inc |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Investment in common shares (in shares) | 10,691,658 |  |  |  |
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% | 20.00% | 55.00%
Holding period | 10 years |  |  |  |
Joint Venture | Seaport Innovation LLC | Discount Rate |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Measurement input | 0.0700 |  |  |  |
Joint Venture | Seaport Innovation LLC | Market Capitalization Rate |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Measurement input | 0.0600 |  |  |  |
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 |  |  |  |
Joint Venture | The LSMD Fund REIT LLC | Discount Rate | Minimum |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Measurement input | 0.0600 |  |  |  |
Joint Venture | The LSMD Fund REIT LLC | Discount Rate | Maximum |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Measurement input | 0.0750 |  |  |  |
Joint Venture | The LSMD Fund REIT LLC | Market Capitalization Rate | Minimum |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Measurement input | 0.0450 |  |  |  |
Joint Venture | The LSMD Fund REIT LLC | Market Capitalization Rate | Maximum |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Measurement input | 0.0650 |  |  |  |
Recurring | Level 1 | Carrying Amount | AlerisLife Inc |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Investments | $ 5,880 | $ 31,540 |  |  |
Investment in common shares (in shares) | 10,691,658 |  |  |  |
Unrealized loss on equity securities, net |  | (42,232) |  |  |
Recurring | Level 1 | Estimated Fair Value | AlerisLife Inc |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Investments | $ 5,880 | 31,540 |  |  |
Recurring | Joint Venture | Level 3 | Carrying Amount | Seaport Innovation LLC |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Investments |  | 215,127 |  |  |
Recurring | Joint Venture | Level 3 | Carrying Amount | The LSMD Fund REIT LLC |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Investments |  | 0 |  |  |
Recurring | Joint Venture | Level 3 | Estimated Fair Value | Seaport Innovation LLC |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Investments | 104,697 | 215,127 |  |  |
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 | 50,780 | $ 0 |  |  |
Recurring | Joint Venture | Level 3 | Carrying Amount | Seaport Innovation LLC |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |
Investments | 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 | $ 50,780 |  |  |  |

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