v3.10.0.1
Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Capital lease obligation (6.8%) $ 445 $ 569
Total debt and capital lease obligation 990,800 999,188
Less: Amounts due within one year (11,268) (11,268)
Long-term portion 979,532 987,920
Term Loan | Third First Lien Term Loan (4.4% as of September 30, 2018)    
Debt Instrument [Line Items]    
Principal 986,309 993,762
Unamortized debt premium and issuance costs 4,046 4,857
Long-term debt $ 990,355 $ 998,619
Effective rate 4.40%  
Capital lease obligation    
Debt Instrument [Line Items]    
Effective rate 6.80%