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Long-Term Debt - Schedule of Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Jun. 05, 2019
Debt Instrument [Line Items]      
Debt issuance costs $ (9,100) $ (11,800)  
Long-term debt, net of debt issuance costs 1,284,400 1,505,000  
Current portion of long-term debt (13,000) (13,000)  
Long-term debt $ 1,271,438 $ 1,491,996  
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%
Senior notes $ 696,500 $ 698,300  
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%  
Senior notes $ 597,000 $ 598,500  
Series 2019-1 Variable Funding Senior Notes Class A-1, variable interest rate of 2.42% at December 31, 2020      
Debt Instrument [Line Items]      
Debt interest rate (percent)   2.42%  
Senior notes $ 0 $ 220,000