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Long-Term Debt and Credit Facility - Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Long-term Debt    
Unamortized discount $ (2,448) $ (3,122)
Unamortized deferred financing costs (4,234) (5,509)
Total long-term debt 305,818 303,869
Long-term debt, net of current maturities $ 305,818 303,869
First Lien Credit Facility    
Long-term Debt    
Interest rate (as a percent) 7.02%  
Long-term debt $ 312,500 $ 312,500