Long-Term Debt and Credit Facility - Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total long-term debt	$ 309,482	$ 309,000
Less current maturities of long-term debt	(9,000)	(9,000)
Long-term debt, excluding current maturities	$ 300,482	$ 300,000
Sellers Note
Debt Instrument [Line Items]
Interest rate (as a percent)	5.00%	5.00%
Long-term debt	$ 9,000	$ 9,000
First Lien Credit Facility
Debt Instrument [Line Items]
Interest rate (as a percent)	5.50%
Long-term debt	$ 312,500	312,500
Unamortized discount	(4,274)	(4,459)
Unamortized deferred financing costs	$ (7,744)	$ (8,041)