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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Loan Portfolio (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total carrying value, net $ 7,857,260 $ 6,496,977
Commercial Mortgage and Subordinated Portfolio Segment    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total carrying value, net 97,800 136,100
Commercial Mortgage Portfolio Segment    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total carrying value, net [1],[2] 7,012,312 5,451,084
Subordinate Mortgage Portfolio Segment    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total carrying value, net [2] $ 844,948 $ 1,045,893
[1] Includes $5,957,707 and $5,418,999 pledged as collateral under secured debt arrangements in 2021 and 2020, respectively.
[2] Net of $178,588 and $213,102 CECL Allowances in 2021 and 2020, respectively, comprised of $145,000 and $175,000 Specific CECL Allowance and $33,588 and $38,102 General CECL Allowance, respectively.