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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