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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 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Allowance and Provision for Loan Credit Loss [Abstract]            
Quarter allowances (reversals), specific CECL allowance, funded [1] $ (25,169)   $ (15,000) $ 158,296 $ (15,000)  
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward]            
Beginning balance, General CECL allowance, funded 58,273 $ 0   0    
Quarter allowances (reversals), General CECL allowance, funded (13,729) 30,494        
Realized loss, General CECL allowance, funded 0          
Ending balance, General CECL allowance, funded 44,544 58,273   44,544    
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward]            
Beginning balance, General CECL allowance, unfunded 6,059 0   0    
Quarter allowances (reversals), General CECL allowance, unfunded (1,940) 2,971        
Realized loss, General CECL allowance, unfunded 0          
Ending balance, General CECL allowance, unfunded 4,119 6,059   4,119    
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]            
General CECL Allowance 64,332 0   0    
Total quarter allowances (reversals), General CECL allowance (15,669) 33,465        
Total, realized loss, General CECL allowance 0          
General CECL Allowance 48,663 64,332   48,663    
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]            
Total CECL Allowance 271,313 56,981   56,981    
Total CECL Allowance, Quarter allowances (reversals) (10,169) 183,465        
Total CECL allowance, realized loss (15,000)          
Total CECL Allowance $ 246,144 $ 271,313   $ 246,144    
General CECL allowance, % of amortized cost 0.81% 1.08%   0.81%   0.00%
Total CECL allowance, % of amortized cost 3.71% 4.05%   3.71%   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]            
Begining balance, specific CECL allowance, funded $ 206,981 56,981   56,981    
Quarter allowances (reversals), specific CECL allowance, funded 5,500 150,000        
Realized Loss, specific CECL allowance, funded (15,000)          
Ending balance, specific CECL allowance, funded $ 197,481 206,981   197,481    
Commercial Mortgage and Subordinated Portfolio Segment | Adjustment due to Adoption of ASU            
Allowance and Provision for Loan Credit Loss [Abstract]            
Begining balance, specific CECL allowance, funded   $ 0   $ 0    
[1] Comprised of $(9,500) and $140,500 of Specific CECL (Reversals) Allowance and $(15,669) and $17,796 of General CECL (Reversals) Allowance for the three and six months ended June 30, 2020, respectively.