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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 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Allowance and Provision for Loan Credit Loss [Abstract]              
Quarter allowances (reversals), specific CECL allowance, funded [1] $ (6,342)     $ 35,000 $ 151,954 $ 20,000  
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward]              
Beginning balance, General CECL allowance, funded 44,544 $ 58,273 $ 0   0    
Quarter allowances (reversals), General CECL allowance, funded (5,268) (13,729) 30,494        
Realized loss, General CECL allowance, funded   0          
Ending balance, General CECL allowance, funded 39,276 44,544 58,273   39,276    
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward]              
Beginning balance, General CECL allowance, unfunded 4,119 6,059 0   0    
Quarter allowances (reversals), General CECL allowance, unfunded (524) (1,940) 2,971        
Realized loss, General CECL allowance, unfunded   0          
Ending balance, General CECL allowance, unfunded 3,595 4,119 6,059   3,595    
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]              
General CECL Allowance 48,663 64,332 0   0    
Total quarter allowances (reversals), General CECL allowance (5,792) (15,669) 33,465        
Total, realized loss, General CECL allowance   0          
General CECL Allowance 42,871 48,663 64,332   42,871    
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]              
Total CECL Allowance 246,144 271,313 56,981   56,981    
Total CECL Allowance, Quarter allowances (reversals) (6,342) (10,169) 183,465        
Total CECL allowance, realized loss   (15,000)          
Total CECL Allowance $ 239,802 $ 246,144 $ 271,313   $ 239,802    
General CECL allowance, % of amortized cost 0.71% 0.81% 1.08%   0.71%   0.00%
Total CECL allowance, % of amortized cost 3.59% 3.71% 4.05%   3.59%   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    
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward]              
Beginning balance, General CECL allowance, unfunded     3,088   3,088    
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]              
General CECL Allowance     30,867   30,867    
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]              
Total CECL Allowance     30,867   30,867    
Commercial Mortgage and Subordinated Portfolio Segment              
Allowance and Provision for Loan Credit Loss [Abstract]              
Beginning balance, specific CECL allowance, funded $ 197,481 $ 206,981 56,981   56,981    
Quarter allowances (reversals), specific CECL allowance, funded (550) 5,500 150,000        
Realized Loss, specific CECL allowance, funded   (15,000)          
Ending balance, specific CECL allowance, funded 196,931 $ 197,481 206,981   196,931    
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward]              
Ending balance, General CECL allowance, unfunded $ 3,600       3,600    
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    
[1] Comprised of $550 and $(139,950) of Specific CECL Reversal (Allowance) and $5,792 and $(12,004) of General CECL Reversal (Allowance) for the three and nine months ended September 30, 2020, respectively.