Debt (Details) - USD ($) $ in Thousands		Jun. 30, 2016	Dec. 31, 2015
Senior debt:
Total debt		$ 412,250	$ 439,399
Less: Debt issuance costs		(5,872)	(6,569)
Total debt, net of debt issuance costs		406,378	432,830
Less: Current maturities	[1]	(406,378)	(432,830)
Total debt, net of current maturities		0	0
Revolving credit facility
Senior debt:
Total debt		123,500	143,149
Term loan
Senior debt:
Total debt		$ 288,750	$ 296,250

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