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Long-Term Debt - Narrative (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 05, 2019
USD ($)
extensionTerm
Aug. 31, 2022
USD ($)
renewalPeriod
Mar. 31, 2020
USD ($)
Dec. 31, 2022
USD ($)
Rate
Dec. 31, 2022
USD ($)
Rate
Dec. 31, 2021
USD ($)
Rate
Dec. 31, 2020
USD ($)
Aug. 12, 2022
USD ($)
Debt Instrument [Line Items]                
Threshold percentage       50.00% 50.00%      
Cash sweeping event | Rate       175.00% 175.00%      
Rapid amortization event | Rate       120.00% 120.00%      
Manager termination event | Rate       120.00% 120.00%      
Interest-only debt service coverage ratio, default event | Rate       110.00% 110.00%      
Debt service coverage ratio | Rate       410.00% 410.00%      
Series 2019-1 4.723% Fixed Rate Senior Secured Notes, Class A-2-II and Series 2019-1 4.194% Fixed Rate Senior Secured Notes, Class A-2-I                
Debt Instrument [Line Items]                
Number of tranches issued | extensionTerm 2              
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              
Debt instrument, make-whole premium       $ 0 $ 0      
Series 2019-1 4.194% Fixed Rate Senior Secured Notes, Class A-2-I | Ten Year United States Treasury Bill Rate                
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% 4.723%    
Debt instrument, face amount $ 600,000,000              
Debt instrument, make-whole premium       $ 500,000 $ 500,000      
Series 2019-1 4.723% Fixed Rate Senior Secured Notes, Class A-2-II | Ten Year United States Treasury Bill Rate                
Debt Instrument [Line Items]                
Basis spread on variable rate 2.64%              
Series 2022-1 Variable Funding Class A-1, Variable Rate of 5.50% at December 31, 2022                
Debt Instrument [Line Items]                
Debt interest rate (percent)       5.50% 5.50%      
Letters of credit outstanding       $ 3,400,000 $ 3,400,000      
Line of credit facility, current borrowing capacity       $ 221,600,000 $ 221,600,000      
Series 2022-1 Variable Funding Class A-1, Variable Rate of 5.50% at December 31, 2022 | Revolving Credit Facility                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity   $ 325,000,000           $ 325,000,000
Proceeds from long-term lines of credit   $ 100,000,000            
Debt, weighted average interest rate       3.64% 3.64%      
Number of renewal periods | renewalPeriod   2            
Renewal period term (in years)   1 year            
Interest rate percentage after renewal date         5.00%      
Debt issuance costs, gross   $ 6,300,000            
Amortization of financing costs         $ 400,000      
Debt issuance costs, net       $ 5,900,000 5,900,000      
Series 2022-1 Variable Funding Class A-1, Variable Rate of 5.50% at December 31, 2022 | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate                
Debt Instrument [Line Items]                
Basis spread on variable rate   2.50%            
Series 2022-1 Variable Funding Class A-1, Variable Rate of 5.50% at December 31, 2022 | Letter of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate                
Debt Instrument [Line Items]                
Basis spread on variable rate   0.50%            
Series 2022-1 Variable Funding Class A-1, Variable Rate of 5.50% at December 31, 2022 | Letter of Credit | Federal Funds Rate                
Debt Instrument [Line Items]                
Basis spread on variable rate   0.50%            
Series 2022-1 Variable Funding Class A-1, Variable Rate of 5.50% at December 31, 2022 | Letter of Credit | Base Rate                
Debt Instrument [Line Items]                
Basis spread on variable rate   2.00%            
Series 2019-1 Variable Funding Senior Notes Class A-1 [Member] | Revolving Credit Facility                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity       $ 225,000,000 $ 225,000,000      
Line of credit facility, expired amount               $ 225,000,000
Proceeds from long-term lines of credit     $ 220,000,000          
Repayments of long-term lines of credit     $ 220,000,000          
Line of credit facility, amount outstanding           $ 0    
Debt, weighted average interest rate       2.42% 2.42%      
Gain (loss) on extinguishment of debt       $ 1,400,000 $ (1,200,000)      
Extinguishment of debt       40,000,000        
Amortization of financing costs         400,000 $ 600,000 $ 600,000  
Debt issuance costs, net       $ 1,500,000 $ 1,500,000      
Series 2019-1 Variable Funding Senior Notes Class A-1 [Member] | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Basis spread on variable rate         2.15%      
Line of credit facility, percentage of advances drawn         60.00%      
Series 2019-1 Variable Funding Senior Notes Class A-1 [Member] | Revolving Credit Facility | Commercial Paper Funding Rate Of Conduit Investor                
Debt Instrument [Line Items]                
Basis spread on variable rate         2.15%      
Line of credit facility, percentage of advances drawn         40.00%      
2019 Class A-2 Notes                
Debt Instrument [Line Items]                
Additional interest on fixed rate 5.00%              
Debt instrument, term 10 years              
Covenant compliance, leverage ratio, maximum | Rate       525.00% 525.00% 525.00%    
Ratio of indebtedness to net capital | Rate       440.00% 440.00%      
Debt instrument, periodic payment, principal $ 3,250,000       $ 3,250,000      
Repayments of debt, principle           $ 9,750,000    
Debt issuance costs, gross       $ 12,900,000 12,900,000      
Amortization of financing costs         2,400,000 $ 2,200,000 $ 2,100,000  
Debt issuance costs, net       5,100,000 5,100,000      
Debt instrument, annual principal payment       $ 13,000,000 $ 13,000,000      
2019 Class A-2 Notes | Maximum                
Debt Instrument [Line Items]                
Ratio of indebtedness to net capital | Rate       525.00% 525.00%