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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

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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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