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Fair Value of Financial Instruments (Details) - First Lien Credit Facility - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Liabilities:    
Carrying amount $ 312,500 $ 312,500
Term Loan    
Liabilities:    
Carrying amount 312,500 312,500
Long-term debt 203,125 228,125
Level 2 | Term Loan    
Liabilities:    
Long-term debt $ 203,125 $ 228,125