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Debt - Net of Unamortized Discounts and Deferred Financing Fees (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Less: Amounts due within one year $ 4,748 $ 6,419
Long-term debt 398,619 400,309
Loans Payable    
Debt Instrument [Line Items]    
Long-term Debt, Total 904 2,771
Term loan    
Debt Instrument [Line Items]    
Long-term Debt, Total 406,937 410,125
Unamortized deferred issuance costs $ (4,474) $ (6,168)