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Long-Term Debt (Narrative) (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2026
Sep. 30, 2020
USD ($)
Rate
Sep. 30, 2020
USD ($)
numberOfExtensionTerm
Rate
Dec. 31, 2019
USD ($)
Jun. 05, 2019
USD ($)
Debt Instrument [Line Items]          
Ratio of indebtedness to net capital | Rate   667.00% 667.00%    
DSCR less than 1.20x - Rapid Amortization Event | Rate   120.00% 120.00%    
Interest-only DSCR less than 1.20x - Manager Termination Event | Rate   120.00% 120.00%    
Interest-only DSCR less than 1.10x - Default Event | Rate   110.00% 110.00%    
Debt service coverage ratio | Rate   320.00% 320.00%    
Debt issuance costs, gross   $ 12,900,000 $ 12,900,000    
Amortization of debt issuance costs   500,000 1,600,000    
Unamortized debt issuance costs   12,500,000 $ 12,500,000 $ 11,800,000  
Incurred cost   $ 200,000      
Maximum          
Debt Instrument [Line Items]          
DSCR less than 1.75x - Cash Flow Sweeping Event | Rate   175.00% 175.00%    
Letter of Credit | Eurodollar          
Debt Instrument [Line Items]          
Basis spread on variable rate   1.00%      
Letter of Credit | Base Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate   1.15%      
Letter of Credit | Federal Funds Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate   0.50%      
Series 2019-1 4.194% Fixed Rate Senior Secured Notes, Class A-2-I          
Debt Instrument [Line Items]          
Debt interest rate (percent)   4.194% 4.194% 4.194% 4.194%
Debt instrument, face amount         $ 700,000,000
Quarterly principal payment     $ 3,250,000    
Make-whole premium   $ 41,000,000 $ 41,000,000    
Series 2019-1 4.194% Fixed Rate Senior Secured Notes, Class A-2-I | Maximum          
Debt Instrument [Line Items]          
Ratio of indebtedness to net capital | Rate   525.00% 525.00%    
Series 2019-1 4.194% Fixed Rate Senior Secured Notes, Class A-2-I | Forecast          
Debt Instrument [Line Items]          
Additional interest on fixed rate 5.00%        
Debt instrument, term 10 years        
Series 2019-1 4.194% Fixed Rate Senior Secured Notes, Class A-2-I | Ten Year United States Treasury Bill Rate | Forecast          
Debt Instrument [Line Items]          
Basis spread on variable rate 2.15%        
Series 2019-1 4.723% Fixed Rate Senior Secured Notes, Class A-2-II          
Debt Instrument [Line Items]          
Debt interest rate (percent)   4.723% 4.723% 4.723%  
Debt instrument, face amount         600,000,000
Make-whole premium   $ 84,000,000 $ 84,000,000    
Series 2019-1 4.723% Fixed Rate Senior Secured Notes, Class A-2-II | Ten Year United States Treasury Bill Rate | Forecast          
Debt Instrument [Line Items]          
Basis spread on variable rate 2.64%        
Series 2019-1 Variable Funding Senior Notes Class A-1, variable interest rate of 2.44% at September 30, 2020          
Debt Instrument [Line Items]          
Debt interest rate (percent)   2.44% 2.44%    
Letters of credit outstanding, amount   $ 2,800,000 $ 2,800,000    
Line of credit facility, current borrowing capacity   2,200,000 2,200,000    
Series 2019-1 Variable Funding Senior Notes Class A-1, variable interest rate of 2.44% at September 30, 2020 | Revolving Credit Facility          
Debt Instrument [Line Items]          
Long-term Line of Credit   220,000,000.0 220,000,000.0    
Line of credit facility, maximum borrowing capacity   $ 225,000,000 $ 225,000,000   $ 225,000,000
Long-term debt, weighted average interest rate, over time   2.53% 3.31%    
Number of additional extension terms | numberOfExtensionTerm     2    
Extension term     1 year    
Unamortized debt issuance costs   $ 2,600,000 $ 2,600,000    
Series 2019-1 Variable Funding Senior Notes Class A-1, variable interest rate of 2.44% at September 30, 2020 | Revolving Credit Facility | Eurodollar          
Debt Instrument [Line Items]          
Basis spread on variable rate   2.15%      
Series 2019-1 Variable Funding Senior Notes Class A-1, variable interest rate of 2.44% at September 30, 2020 | Letter of Credit          
Debt Instrument [Line Items]          
Basis spread on variable rate   2.15%      
Series 2014-1 4.277% Fixed Rate Senior Secured Notes, Class A-2          
Debt Instrument [Line Items]          
Debt interest rate (percent)   4.277% 4.277%    
Repayments of debt     $ 1,280,000,000    
Series 2018-1 Variable Funding Senior Notes Class A-1, variable interest rate of 4.93% at December 31, 2018          
Debt Instrument [Line Items]          
Amortization of debt issuance costs   $ 100,000 400,000    
Unamortized debt issuance costs   $ 2,800,000 $ 2,800,000