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Debt - Schedule of Maturities of Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt    
2018 $ 2,350  
2019 2,350  
2020 2,350  
2021 2,350  
2022 2,350  
Thereafter 220,313  
Senior Secured Credit Facility $ 232,063 $ 234,412