Long-Term Debt (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Senior debt:
Total debt		$ 422,000	$ 439,399
Less: Debt issuance costs		(5,890)	(6,569)
Total debt, net of debt issuance costs		416,110	432,830
Less: Current maturities	[1]	(416,110)	(432,830)
Long-term debt, net of current maturities		0	0
Revolving credit facility
Senior debt:
Total debt		129,500	143,149
Term loans [Member]
Senior debt:
Total debt		$ 292,500	$ 296,250

[1] See Note 13 “Restatement of Previously Issued Financial Statements