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Long-Term Debt - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2026
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jun. 05, 2019
Dec. 31, 2018
Sep. 05, 2018
Debt Instrument [Line Items]                
DSCR less than 1.20x - Rapid Amortization Event   120.00%   120.00%        
Interest-only DSCR less than 1.20x - Manager Termination Event   120.00%   120.00%        
Interest-only DSCR less than 1.10x - Default Event   110.00%   110.00%        
Debt service coverage ratio   435000.00%   435000.00%        
Debt issuance costs, gross   $ 12,900,000   $ 12,900,000        
Amortization of debt issuance costs   500,000   600,000        
Unamortized debt issuance costs   12,300,000   12,300,000     $ 9,700,000  
Incurred cost       200,000        
Loss on extinguishment of debt   $ 0 $ 0 $ 8,276,000 $ 0      
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%   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    
Ratio of indebtedness to net capital   465000.00%   465000.00%        
Make-whole premium   $ 38,000,000   $ 38,000,000        
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%   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%     4.723%  
Debt instrument, face amount           $ 600,000,000    
Make-whole premium   $ 67,000,000   $ 67,000,000        
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 ___% at June 30, 2019                
Debt Instrument [Line Items]                
Unamortized debt issuance costs   2,800,000   2,800,000        
Series 2019-1 Variable Funding Senior Notes Class A-1, variable interest rate of ___% at June 30, 2019 | Revolving Credit Facility                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity   $ 225,000,000   $ 225,000,000        
Series 2019-1 Variable Funding Senior Notes Class A-1, variable interest rate of ___% at June 30, 2019 | 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 ___% at June 30, 2019 | 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%   4.277%     4.277%  
Repayments of debt       $ 1,280,000,000        
Amortization of debt issuance costs       1,400,000        
Loss on extinguishment of debt       8,300,000        
Series 2018-1 Variable Funding Senior Notes Class A-1, variable interest rate of 4.93% at December 31, 2018                
Debt Instrument [Line Items]                
Debt interest rate (percent)             4.93%  
Line of credit facility, current borrowing capacity   $ 222,200,000   222,200,000        
Repayments of notes payable       25,000,000.0        
Line of credit facility, amount outstanding   $ 25,000,000.0   $ 25,000,000.0        
Debt, weighted average interest rate   4.88%   4.88%        
Amortization of debt issuance costs   $ 200,000   $ 700,000        
Unamortized debt issuance costs   2,800,000   2,800,000        
Series 2018-1 Variable Funding Senior Notes Class A-1, variable interest rate of 4.93% at December 31, 2018 | Letter of Credit                
Debt Instrument [Line Items]                
Debt instrument, collateral amount   $ 2,800,000   $ 2,800,000        
2018-1 Class A-1 Notes | Revolving Credit Facility                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity               $ 225,000,000
Unamortized debt issuance expense     900,000   900,000      
Costs incurred, debt         1,600,000      
Debt issuance costs, net     2,500,000   $ 2,500,000      
2018-1 Class A-1 Notes | Revolving Credit Facility | Interest Expense                
Debt Instrument [Line Items]                
Costs incurred, debt     $ 1,600,000