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Long-term Debt - Schedule of Long-term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Long-term debt    
Less: current portion $ (2,843) $ (2,843)
Long-term debt 275,923 276,465
2023 Term Loans    
Long-term debt    
2023 Term Loans, due March 26, 2023 278,766 279,308
Less: current portion (2,843) (2,843)
Long-term debt $ 275,923 $ 276,465