Debt - Net of Unamortized Discounts and Deferred Financing Fees (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Less: Amounts due within one year	$ 5,313	$ 15,250
Total long-term debt due after one year	402,333	392,996
Term loan
Debt Instrument [Line Items]
Total Term Loan outstanding	407,646	408,246
Less: Amounts due within one year	5,313	15,250
Total long-term debt due after one year	$ 402,333	$ 392,996