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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Cost Recovery Loans (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]      
Specific CECL allowance $ 335,000   $ 193,000
Amortized cost $ 556,000   $ 693,700
Equity contribution rate 90.00%    
Turner Consulting      
Financing Receivable, Credit Quality Indicator [Line Items]      
Equity contribution rate 10.00%    
Retail Center - Cincinnati, OH      
Financing Receivable, Credit Quality Indicator [Line Items]      
Payment in kind interest $ 600 $ 700  
Retail Center - Cincinnati, OH | Capitalization Rate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loan collateral, measurement input 0.090    
Residential-for-Sale - Manhattan, NY | Discount Rate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loan collateral, measurement input 0.10    
Mortgage, Amortized cost      
Financing Receivable, Credit Quality Indicator [Line Items]      
Amortized cost prior to Specific CECL Allowance $ 166,301    
Specific CECL allowance 67,000    
Amortized cost 99,301    
Mortgage, Amortized cost | Retail Center - Cincinnati, OH      
Financing Receivable, Credit Quality Indicator [Line Items]      
Amortized cost prior to Specific CECL Allowance 166,301    
Specific CECL allowance 67,000    
Amortized cost 99,301    
Mezzanine Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Amortized cost prior to Specific CECL Allowance 295,881    
Specific CECL allowance 268,000    
Amortized cost 27,881    
Mezzanine Loans | Residential-for-Sale - Manhattan, NY      
Financing Receivable, Credit Quality Indicator [Line Items]      
Amortized cost prior to Specific CECL Allowance 295,881    
Specific CECL allowance 268,000    
Amortized cost 27,881    
Real Estate and Mezzanine      
Financing Receivable, Credit Quality Indicator [Line Items]      
Amortized cost prior to Specific CECL Allowance 462,182    
Specific CECL allowance 335,000    
Amortized cost $ 127,182