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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Loan Portfolio (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total carrying value, net $ 7,974,031 $ 8,681,990
Commercial Mortgage and Subordinated Portfolio Segment    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total carrying value, net 102,600 138,300
Commercial Mortgage Portfolio Segment    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total carrying value, net [1],[2] 7,561,254 8,121,109
Subordinate Mortgage Portfolio Segment    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total carrying value, net [2],[3] $ 412,777 $ 560,881
[1] Includes $7,203,350 and $7,482,658 pledged as collateral under secured debt arrangements in 2023 and 2022, respectively.
[2] Net of $220,305 and $159,724 CECL Allowance in 2023 and 2022, respectively, comprised of $193,000 and $133,500 Specific CECL Allowance and $27,305 and $26,224 General CECL Allowance, respectively.
[3] Includes $213,139 and $191,608 pledged as collateral under secured debt arrangements in 2023 and 2022, respectively.