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Loans Receivable - Schedule of Loans Receivable (Details)
3 Months Ended
Mar. 01, 2024
USD ($)
loan
Mar. 31, 2024
USD ($)
loan
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]        
Unamortized discounts and fees   $ (6,260,000) $ (131,000)  
Reserve for loan losses   (9,334,000) (2,830,000) $ (8,280,000)
Loans receivable, net   267,798,000 218,450,000  
Loans and leases receivable, remaining commitments   $ 74,000,000    
Number of loans | loan   6    
Loans receivables, acquired $ 124,000,000      
Unamortized discount $ 5,000,000      
Sunrise Senior Housing Portfolio        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loans receivable, net   $ 63,000,000    
Loans and leases receivable, remaining commitments   0 29,000,000  
Secured Loans        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Financing receivable, gross   200,289,000 178,678,000  
Reserve for loan losses   (8,230,000) (2,830,000) $ (8,280,000)
Number of loans | loan 9      
Loans receivable, outstanding balance $ 89,000,000      
CCRC resident loans        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Financing receivable, gross   47,283,000 42,733,000  
Mezzanine Loans        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Financing receivable, gross   $ 35,820,000 $ 0  
Number of loans | loan 10      
Loans receivable, outstanding balance $ 36,000,000