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Loans Receivable - Sunrise Senior Housing Portfolio Seller Financing and Other Seller Financing (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2024
USD ($)
Jun. 30, 2023
Feb. 28, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jul. 31, 2022
USD ($)
Feb. 28, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jan. 31, 2021
USD ($)
property
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Loans receivable                      
Net cash provided by (used in) financing activities                 $ (337,299) $ (116,532) $ (1,288,517)
Loans receivable       $ 374,832         218,450 374,832  
Sunrise Senior Housing Portfolio                      
Loans receivable                      
Capital expenditure funding, amount committed                 40,000    
Capital expenditure funding, amount funded                 11,000    
Senior Housing Operating Portfolio                      
Loans receivable                      
Proceeds from sale of buildings               $ 230,000      
Net cash provided by (used in) financing activities               150,000      
Senior Housing Operating Portfolio                      
Loans receivable                      
Net cash provided by (used in) financing activities               410,000      
Senior Housing Operating Portfolio | Sunrise Senior Housing Portfolio                      
Loans receivable                      
Capital expenditure funding, amount committed               $ 92,000      
Capital expenditure funding, cost of capital, percent committed               65.00%      
Senior Housing Operating Portfolio                      
Loans receivable                      
Number of assets sold | property               16      
Senior Housing Operating Portfolio | Sunrise Senior Housing Portfolio                      
Loans receivable                      
Number of assets sold | property               32      
Proceeds from sale of buildings               $ 664,000      
Proceeds from the collection of loans receivable       10,000 $ 27,000 $ 8,000 $ 246,000        
Loans receivable       120,000         131,000 120,000  
Senior Housing Operating Portfolio | Secured Overnight Financing Rate (SOFR) | Sunrise Senior Housing Portfolio                      
Loans receivable                      
Loans receivable, conversion of basis spread on variable rate   0.10%                  
Secured Mortgage Loans                      
Loans receivable                      
Proceeds from the collection of loans receivable     $ 102,000                
Loans receivable             $ 53,000        
Secured Mortgage Loans | Subsequent Event                      
Loans receivable                      
Loans receivable, floor rate percentage 12.00%                    
Loans receivable, extension fee $ 1,000                    
Secured Mortgage Loans | Senior Housing Operating Portfolio                      
Loans receivable                      
Loans receivable       $ 150,000         $ 48,000 $ 150,000  
Secured Mortgage Loans | Secured Overnight Financing Rate (SOFR)                      
Loans receivable                      
Variable rate     0.11%                
Secured Mortgage Loans | Secured Overnight Financing Rate (SOFR) | Subsequent Event                      
Loans receivable                      
Loans receivable, floor rate percentage 7.00%                    
Loans receivable, conversion of basis spread on variable rate 0.11%                    
Secured Mortgage Loans | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate, First Six Months                      
Loans receivable                      
Variable rate     6.00%                
Secured Mortgage Loans | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate, Last Six Months                      
Loans receivable                      
Variable rate     7.00%                
Loans receivable, extension fee     $ 1,000