Quarterly report pursuant to Section 13 or 15(d)

Credit facilities - Senior Credit Facilities (Details)

v3.21.1
Credit facilities - Senior Credit Facilities (Details)
1 Months Ended 3 Months Ended
Apr. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
facility
Feb. 28, 2021
USD ($)
Mar. 31, 2021
USD ($)
facility
Dec. 31, 2020
USD ($)
Line of Credit Facility [Line Items]          
Unamortized debt issuance costs   $ 11,000,000   $ 11,000,000 $ 12,000,000
Revolving Credit Facility          
Line of Credit Facility [Line Items]          
Number of revolving credit facilities | facility   2   2  
Unamortized issuance costs   $ 3,000,000   $ 3,000,000  
Default underlying financings (more than)       50.00%  
Revolving Credit Facility | LIBOR | Credit Default Option          
Line of Credit Facility [Line Items]          
Basis spread on variable rate       2.00%  
Revolving Credit Facility | Rep-Based Facility          
Line of Credit Facility [Line Items]          
Principal amount   100,000,000 $ 250,000,000 $ 100,000,000  
Loss on modification   $ 1,500,000      
Availability fee percentage       0.60%  
Revolving Credit Facility | Rep-Based Facility | U.S. federal government          
Line of Credit Facility [Line Items]          
Applicable valuation percentages       85.00%  
Revolving Credit Facility | Rep-Based Facility | Institutional          
Line of Credit Facility [Line Items]          
Applicable valuation percentages       80.00%  
Revolving Credit Facility | Rep-Based Facility | LIBOR          
Line of Credit Facility [Line Items]          
Basis spread on variable rate       1.40%  
Fixed interest rate   1.85%   1.85%  
Revolving Credit Facility | Rep-Based Facility | Federal funds rate          
Line of Credit Facility [Line Items]          
Basis spread on variable rate       0.40%  
Fixed interest rate   0.85%   0.85%  
Revolving Credit Facility | Approval-Based Facility          
Line of Credit Facility [Line Items]          
Principal amount   $ 200,000,000   $ 200,000,000  
Revolving Credit Facility | Approval-Based Facility | Certain approved existing financing          
Line of Credit Facility [Line Items]          
Applicable valuation percentages       85.00%  
Revolving Credit Facility | Approval-Based Facility | Others as prescribed by administrative agent          
Line of Credit Facility [Line Items]          
Applicable valuation percentages       67.00%  
Revolving Credit Facility | Approval-Based Facility | LIBOR          
Line of Credit Facility [Line Items]          
Basis spread on variable rate       1.50%  
Fixed interest rate   2.00%   2.00%  
Revolving Credit Facility | Approval-Based Facility | Federal funds rate          
Line of Credit Facility [Line Items]          
Basis spread on variable rate       0.50%  
Fixed interest rate   1.00%   1.00%  
Revolving Credit Facility | Unsecured Revolver          
Line of Credit Facility [Line Items]          
Principal amount     $ 50,000,000    
Unamortized debt issuance costs   $ 1,000,000   $ 1,000,000  
Term loan fee (in percent)     2.25%    
Revolving Credit Facility | Unsecured Revolver | Subsequent Event          
Line of Credit Facility [Line Items]          
Principal amount $ 400,000,000        
Short-term Debt, Terms 364-day        
Revolving Credit Facility | Unsecured Revolver | LIBOR          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     2.25%    
Variable rate, maximum downward adjustment     0.05%    
Revolving Credit Facility | Unsecured Revolver | Prime Rate          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     1.25%