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Long-Term Debt (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended
Jun. 30, 2026
Mar. 31, 2020
Dec. 31, 2019
Jun. 05, 2019
Debt Instrument [Line Items]        
Ratio of indebtedness to net capital   479.00%    
DSCR less than 1.20x - Rapid Amortization Event   120.00%    
Interest-only DSCR less than 1.20x - Manager Termination Event   120.00%    
Interest-only DSCR less than 1.10x - Default Event   110.00%    
Debt service coverage ratio   393.00%    
Debt issuance costs, gross   $ 12,900,000    
Amortization of debt issuance costs   500,000    
Unamortized debt issuance costs   13,800,000 $ 11,800,000  
Incurred cost   $ 200,000    
Eurodollar | Letter of Credit        
Debt Instrument [Line Items]        
Basis spread on variable rate   1.00%    
Base Rate | Letter of Credit        
Debt Instrument [Line Items]        
Basis spread on variable rate   1.15%    
Federal Funds Rate | Letter of Credit        
Debt Instrument [Line Items]        
Basis spread on variable rate   0.50%    
Maximum        
Debt Instrument [Line Items]        
DSCR less than 1.75x - Cash Flow Sweeping Event   175.00%    
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%
Debt instrument, face amount       $ 700,000,000
Debt Instrument, Periodic Payment, Principal   $ 3,250,000    
Make-whole premium   $ 32,000,000    
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 4.194% Fixed Rate Senior Secured Notes, Class A-2-I | Maximum        
Debt Instrument [Line Items]        
Ratio of indebtedness to net capital   525.00%    
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%  
Debt instrument, face amount       600,000,000
Make-whole premium   $ 88,000,000    
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 3.39% at March 31, 2020        
Debt Instrument [Line Items]        
Debt interest rate (percent)   3.39%    
Letters of credit outstanding, amount   $ 2,800,000    
Line of credit facility, current borrowing capacity   2,200,000    
Unamortized debt issuance costs   13,800,000    
Series 2019-1 Variable Funding Senior Notes Class A-1, variable interest rate of 3.39% at March 31, 2020 | Revolving Credit Facility        
Debt Instrument [Line Items]        
Long-term Line of Credit   220,000,000.0    
Line of credit facility, maximum borrowing capacity   $ 225,000,000   $ 225,000,000
Debt, weighted average interest rate   3.39%    
Unamortized debt issuance costs   $ 2,600,000    
Series 2019-1 Variable Funding Senior Notes Class A-1, variable interest rate of 3.39% at March 31, 2020 | Letter of Credit        
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 3.39% at March 31, 2020 | Eurodollar | Revolving Credit Facility        
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%    
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   200,000    
Unamortized debt issuance costs   $ 2,800,000