Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Sep. 24, 2015	Jul. 09, 2014
Senior debt:
Total debt	$ 412,250	$ 439,399
Less: Current maturities	(15,000)	(15,000)
Less: Debt issuance costs	(5,872)	(6,569)
Total long-term debt, net of current maturities and debt issuance costs	391,378	417,830
Revolving credit facility [Member]
Senior debt:
Total debt	123,500	143,149
Term loans [Member]
Senior debt:
Total debt	$ 288,750	$ 296,250
Revolving credit facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 400,000	$ 350,000