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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - CECL Allowance as Percentage of Amortized Cost and Total Commitment (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Allowance and Provision for Loan Credit Loss [Abstract]                      
Beginning balance, specific CECL allowance, funded       $ 175,000         $ 175,000    
Quarter allowances (reversals), specific CECL allowance, funded                 (34,773) [1] $ 125,600 [1] $ 20,000
Ending balance, specific CECL allowance, funded $ 145,000       $ 175,000       145,000 175,000  
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward]                      
Beginning balance, General CECL allowance, funded 32,684 $ 38,199 $ 36,435 38,102 39,276 $ 44,544 $ 58,273 $ 0 38,102 0  
Quarter allowances (reversals), General CECL allowance, funded 904 (5,515) 1,764 (1,667) (1,174) (5,268) (13,729) 30,494      
Financing Receivable, Funded, Allowance for Write-Offs     0   0   0        
Ending balance, General CECL allowance, funded 33,588 32,684 38,199 36,435 38,102 39,276 44,544 58,273 33,588 38,102 0
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward]                      
Beginning balance, General CECL allowance, unfunded 2,193 2,444 3,794 3,365 3,595 4,119 6,059 0 3,365 0  
Quarter allowances (reversals), General CECL allowance, unfunded 913 (251) (1,350) 429 (230) (524) (1,940) 2,971      
Write-offs, General CECL allowance, unfunded     0   0   0        
Ending balance, General CECL allowance, unfunded 3,106 2,193 2,444 3,794 3,365 3,595 4,119 6,059 3,106 3,365 0
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]                      
General CECL Allowance 34,877 40,643 40,229 41,467 42,871 48,663 64,332 0 41,467 0  
Total quarter allowances (reversals), General CECL allowance 1,817 (5,766) 414 (1,238) (1,404) (5,792) (15,669) 33,465      
Allowance for loan and lease losses, real estate and off-balance sheet, write-offs     0   0   0        
General CECL Allowance 36,694 34,877 40,643 40,229 41,467 42,871 48,663 64,332 36,694 41,467 0
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]                      
Total CECL Allowance 179,877 185,643 215,229 216,467 239,802 246,144 271,313 56,981 216,467 56,981  
Total CECL Allowance, Quarter allowances (reversals) 1,817 (5,766) (19,586) (1,238) (1,404) (6,342) (10,169) 183,465      
Total CECL allowance, Write-offs     (10,000)   (21,931)   (15,000)        
Total CECL Allowance $ 181,694 $ 179,877 $ 185,643 $ 215,229 $ 216,467 $ 239,802 $ 246,144 $ 271,313 $ 181,694 $ 216,467 $ 56,981
General CECL allowance, % of amortized cost 0.49% 0.51% 0.57% 0.62% 0.67% 0.71% 0.81% 1.08% 0.49% 0.67% 0.00%
Total CECL allowance, % of amortized cost 2.26% 2.43% 2.41% 3.06% 3.23% 3.59% 3.71% 4.05% 2.26% 3.23% 0.00%
Adjustment due to Adoption of ASU                      
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward]                      
Beginning balance, General CECL allowance, funded               $ 27,779   $ 27,779  
Ending balance, General CECL allowance, funded                     $ 27,779
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward]                      
Beginning balance, General CECL allowance, unfunded               3,088   3,088  
Ending balance, General CECL allowance, unfunded                     3,088
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]                      
General CECL Allowance               30,867   30,867  
General CECL Allowance                     30,867
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]                      
Total CECL Allowance               30,867   30,867  
Total CECL Allowance                     30,867
Commercial Mortgage and Subordinated Portfolio Segment                      
Allowance and Provision for Loan Credit Loss [Abstract]                      
Beginning balance, specific CECL allowance, funded $ 145,000 $ 145,000 $ 175,000 $ 175,000 $ 196,931 $ 197,481 $ 206,981 56,981 $ 175,000 56,981  
Quarter allowances (reversals), specific CECL allowance, funded 0 0 (20,000)   0 (550) 5,500 150,000      
Write-offs, specific CECL allowance, funded (10,000)   (10,000)   (21,931)   (15,000)        
Ending balance, specific CECL allowance, funded $ 145,000 $ 145,000 $ 145,000 $ 175,000 $ 175,000 $ 196,931 $ 197,481 206,981 $ 145,000 175,000 56,981
Commercial Mortgage and Subordinated Portfolio Segment | Adjustment due to Adoption of ASU                      
Allowance and Provision for Loan Credit Loss [Abstract]                      
Beginning balance, specific CECL allowance, funded               $ 0   $ 0  
Ending balance, specific CECL allowance, funded                     $ 0
[1] Comprised of $30,000 and $(118,019) Specific CECL Reversals (Allowance) for the years ended December 31, 2021 and 2020, respectively, $4,773 and $(10,600) of General CECL Reversals (Allowance) for the years ended December 31, 2021 and 2020, respectively, and a $3,019 reversal of a previously recorded impairment on an equity investment for the year ended December 31, 2020. For the year ended December 31, 2019 the balance represents provision per loan losses as determined by the authoritative guidance at the time.