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Commercial Mortgage, 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, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance and Provision for Loan Credit Loss [Abstract]              
Quarter allowances (reversals), specific CECL allowance, funded [1]         $ 125,600 $ 20,000 $ 20,000
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward]              
Beginning balance, General CECL allowance, funded $ 39,276 $ 44,544 $ 58,273 $ 0 0    
Quarter allowances (reversals), General CECL allowance, funded (1,174) (5,268) (13,729) 30,494      
Financing Receivable, Funded, Allowance for Write-Offs 0   0        
Ending balance, General CECL allowance, funded 38,102 39,276 44,544 58,273 38,102 0  
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward]              
Beginning balance, General CECL allowance, unfunded 3,595 4,119 6,059 0 0    
Quarter allowances (reversals), General CECL allowance, unfunded (230) (524) (1,940) 2,971      
Write-offs, General CECL allowance, unfunded 0   0        
Ending balance, General CECL allowance, unfunded 3,365 3,595 4,119 6,059 3,365 0  
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]              
General CECL Allowance 42,871 48,663 64,332 0 0    
Total quarter allowances (reversals), General CECL allowance (1,404) (5,792) (15,669) 33,465      
Allowance for loan and lease losses, real estate and off-balance sheet, write-offs 0   0        
General CECL Allowance 41,467 42,871 48,663 64,332 41,467 0  
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]              
Total CECL Allowance 239,802 246,144 271,313 56,981 56,981    
Total CECL Allowance, Quarter allowances (reversals) (1,404) (6,342) (10,169) 183,465      
Total CECL allowance, Write-offs (21,931)   (15,000)        
Total CECL Allowance $ 216,467 $ 239,802 $ 246,144 $ 271,313 $ 216,467 $ 56,981  
General CECL allowance, % of amortized cost 0.67% 0.71% 0.81% 1.08% 0.67% 0.00%  
Total CECL allowance, % of amortized cost 3.23% 3.59% 3.71% 4.05% 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 $ 196,931 $ 197,481 $ 206,981 56,981 56,981    
Quarter allowances (reversals), specific CECL allowance, funded   (550) 5,500 150,000      
Write-offs, specific CECL allowance, funded (21,931)   (15,000)        
Ending balance, specific CECL allowance, funded $ 175,000 $ 196,931 $ 197,481 206,981 175,000 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 $118,019 of Specific CECL Allowance, $10,600 of General CECL Allowance, and a $3,019 reversal of a previously recorded impairment on an equity investment for the year ended December 31, 2020, respectively. For the years ended December 31, 2019 and 2018 the balance represents provision per loan losses as determined by the authoritative guidance at the time.