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Long-Term Debt - Narrative (Details)
1 Months Ended
Dec. 03, 2019
USD ($)
Aug. 01, 2018
USD ($)
extension
Sep. 30, 2023
Jun. 30, 2020
USD ($)
Mar. 20, 2020
USD ($)
Debt Instrument [Line Items]          
Debt issuance costs incurred $ 10,577,000 $ 27,133,000      
Restricted cash       $ 70,399,000  
2018-1 Class A-2-I notes | Senior fixed-rate term notes          
Debt Instrument [Line Items]          
Fixed interest rate   4.262%      
Debt face amount   $ 575,000      
2018-1 Class A-2-II notes | Senior fixed-rate term notes          
Debt Instrument [Line Items]          
Fixed interest rate   4.666%      
Debt face amount   $ 625,000      
2019-1 Class A-2 notes | Senior fixed-rate term notes          
Debt Instrument [Line Items]          
Fixed interest rate 3.858%        
Debt face amount $ 550,000        
Variable funding notes | Revolving Financing Facility          
Debt Instrument [Line Items]          
Maximum borrowing capacity   $ 75,000      
Variable rate percentage         2.95%
Borrowings on line of credit         $ 75,000
Commitment fee percentage   0.50%      
Number of additional extensions | extension   2      
Term of extension   1 year      
Variable funding notes | Revolving Financing Facility | Scenario, Forecast          
Debt Instrument [Line Items]          
Line of credit interest rate     5.00%    
Securitized Senior Notes | Securitized Senior Notes          
Debt Instrument [Line Items]          
Cap on non-securitized indebtedness       $ 50,000,000  
Leverage ratio cap       7.0