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Debt - Schedule of Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt    
Senior Secured Credit Facility $ 231,475 $ 232,063
Less unamortized debt issuance costs (1,705) (1,780)
Less unamortized debt discount (1,244) (1,297)
Less current portion (2,350) (2,350)
Debt, net of current portion $ 226,176 $ 226,636