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Fair Value of Assets and Liabilities - Assets and Liabilities (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
USD ($)
property
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Impairment of assets $ 38,472 $ 12,142  
Number of Properties | property 343    
Held for sale      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Number of Properties | property 11    
Medical Office Building      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Impairment of assets $ 38,472    
Medical Office Building | Held for sale      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Impairment of assets $ 38,472    
Corporate Joint Venture      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Number of Properties | property 11    
Corporate Joint Venture | Seaport Innovation LLC      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Equity method investment ownership percentage 10.00%    
Holding period 10 years    
Number of Properties | property 1    
Corporate Joint Venture | Seaport Innovation LLC | Discount Rate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Measurement input 0.0700    
Corporate Joint Venture | Seaport Innovation LLC | Exit 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    
Number of Properties | property 10    
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 | Exit Capitalization Rate | Minimum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Measurement input 0.0525    
Corporate Joint Venture | The LSMD Fund REIT LLC | Exit Capitalization Rate | Maximum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Measurement input 0.0750    
Recurring Fair Value Measurements Assets | Level 3 | Joint Venture | Carrying Value | Seaport Innovation LLC      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Investments in affiliates, fair value $ 89,870   $ 81,949
Recurring Fair Value Measurements Assets | Level 3 | Joint Venture | Carrying Value | The LSMD Fund REIT LLC      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Investments in affiliates, fair value 43,927   44,910
Recurring Fair Value Measurements Assets | Level 2 | Carrying Value | Interest Rate Cap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Derivative asset 41   0
Non-Recurring Fair Value Measurements Assets | Medical Office Building      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Aggregate sales price $ 20,586    
Non-Recurring Fair Value Measurements Assets | Medical Office Building | Held for sale      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Number of Properties | property 4    
Non-Recurring Fair Value Measurements Assets | Level 2 | Carrying Value      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Real estate properties held for sale $ 20,586   $ 24,074