Long-Term Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Long-term debt obligation
Total debt	$ 77,313	$ 82,687
Less current maturities	3,000	18,375
Long-term debt	$ 74,313	64,312
2013 Revolving Credit Facility, due August 16, 2016
Long-term debt obligation
Basis of interest rate	Eurodollar rate
Remaining borrowing capacity	$ 60,600	73,800
Effective rate of interest (as a percent)	2.67%
2011 Term Loan Facility, due August 16, 2016
Long-term debt obligation
Total debt	$ 64,313	82,687
Basis of interest rate	LIBOR
Effective rate of interest (as a percent)	2.42%
Variable Rate 1 | 2013 Revolving Credit Facility, due August 16, 2016
Long-term debt obligation
Total debt	$ 0	0
Variable Rate 2 | 2013 Revolving Credit Facility, due August 16, 2016
Long-term debt obligation
Total debt	$ 13,000	$ 0
Effective rate of interest (as a percent)	4.75%
Federal Funds Effective Swap Rate
Long-term debt obligation
Additional variable interest rate spread (as a percent)	0.50%
Eurodollar Rate
Long-term debt obligation
Additional variable interest rate spread (as a percent)	1.00%