Long-Term Debt (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Long-term debt obligation
Total debt	$ 73,500	$ 82,687
Less current maturities	18,375	18,375
Total long-term debt	$ 55,125	64,312
2013 Revolving Credit Facility, due August 16, 2016
Long-term debt obligation
Basis of interest rate	Eurodollar rate
Remaining borrowing capacity	$ 73,800
Effective rate of interest (as a percent)	2.44%
2011 Term Loan Facility, due August 16, 2016
Long-term debt obligation
Basis of interest rate	LIBOR
Total debt	$ 73,500	$ 82,687
Effective rate of interest (as a percent)	2.19%