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Long-Term Debt - Schedule of Debt Components (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Debt issuance costs $ (13,900) $ (17,300)
Long-term Debt 1,282,800 1,282,700
Current portion of long-term debt (12,965) 0
Long-term debt, net, less current maturities 1,269,849 1,282,691
Series 2014-1 Class A-2 4.227% Fixed Rate Senior Secured Notes    
Debt Instrument [Line Items]    
Senior Notes $ 1,296,800 $ 1,300,000