Long-Term Debt - Schedule of Debt Components (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2014
Debt Instrument [Line Items]
Class A-2 Note debt issuance costs	$ (9,700)	$ (13,900)
Long-term Debt	1,299,100	1,282,800
Current portion of long-term debt	(25,000)	(12,965)
Long-term debt, net, less current maturities	1,274,087	1,269,849
Series 2014-1 Class A-2 4.227% Fixed Rate Senior Secured Notes
Debt Instrument [Line Items]
Senior Notes	$ 1,283,800	1,296,800
Senior note interest rate	4.227%		4.277%
Series 2018-1 Variable Funding Senior Notes Class A-1, at a variable interest rate of [4.93%] as of December 31, 2018
Debt Instrument [Line Items]
Senior Notes	$ 25,000	$ 0
Senior note interest rate	4.93%

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

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Amount, after accumulated amortization, of debt discount.

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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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