Long-Term Debt and Credit Facility - Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Sep. 02, 2014
Debt Instrument [Line Items]
Unamortized discount	$ (3,795)	$ (4,459)
Unamortized deferred financing costs	(6,783)	(8,041)
Total long-term debt	301,922	309,000
Less current maturities of long-term debt		(9,000)
Long-term debt, excluding current maturities	$ 301,922	300,000
Sellers Note
Debt Instrument [Line Items]
Interest rate (as a percent)	5.00%		5.00%
Long-term debt		9,000
First Lien Credit Facility
Debt Instrument [Line Items]
Interest rate (as a percent)	5.50%
Long-term debt	$ 312,500	312,500
First Lien Credit Facility | Term Loan
Debt Instrument [Line Items]
Long-term debt	$ 312,500
Senior Term Loan | Term Loan
Debt Instrument [Line Items]
Long-term debt		312,500
Senior Term Loan | Sellers Note
Debt Instrument [Line Items]
Long-term debt		$ 9,000