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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Loan Portfolio (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total carrying value, net $ 7,257,304 $ 6,496,977
Commercial Mortgage and Subordinated Portfolio Segment    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total carrying value, net 152,500 136,100
Commercial Mortgage Portfolio Segment    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total carrying value, net [1],[2] 6,397,772 5,451,084
Subordinate Mortgage Portfolio Segment    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total carrying value, net [2] 817,759 1,045,893
Subordinate Mortgage Portfolio Segment, Held For Sale    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total carrying value, net $ 41,773 $ 0
[1] Includes $5,593,505 and $5,418,999 pledged as collateral under secured debt arrangements in 2021 and 2020, respectively
[2] Net of $177,684 and $213,102 CECL Allowances in 2021 and 2020, respectively, comprised of $145,000 and $175,000 Specific CECL Allowance and $32,684 and $38,102 General CECL Allowance, respectively.