Long-Term Debt - Schedule of Debt Components (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Class A-2-I and A-2-II (2019) and Class A-2 (2018) Note debt issuance costs	$ (11,800)	$ (9,700)
Long-term Debt	1,288,200	1,299,100
Current portion of long-term debt	0	(25,000)
Long-term debt, net, less current maturities	1,288,248	1,274,087
Series 2019-1 4.194% Fixed Rate Senior Secured Notes, Class A-2-I
Debt Instrument [Line Items]
Senior Notes	$ 700,000	0
Senior note interest rate	4.194%
Series 2019-1 4.723% Fixed Rate Senior Secured Notes, Class A-2-II
Debt Instrument [Line Items]
Senior Notes	$ 600,000	0
Senior note interest rate	4.723%
Series 2014-1 4.277% Fixed Rate Senior Secured Notes, Class A-2
Debt Instrument [Line Items]
Senior Notes	$ 0	1,283,800
Senior note interest rate	4.277%
Series 2018-1 Variable Funding Senior Notes Class A-1, variable interest rate of 4.93% at December 31, 2018
Debt Instrument [Line Items]
Senior Notes	$ 0	$ 25,000
Class A-2-I and A-2-II (2019) and Class A-2 (2018) Note debt issuance costs	$ (2,800)
Senior note interest rate	4.93%

Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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