Long-Term Debt (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Long-term debt obligation
Total debt	$ 78,094,000	$ 82,687,000
Less current maturities	18,375,000	18,375,000
Total long-term debt	59,719,000	64,312,000
2013 Revolving Credit Facility, due August 16, 2016
Long-term debt obligation
Basis of interest rate	Eurodollar rate
Remaining borrowing capacity	73,800,000
Effective rate of interest (as a percent)	2.43%
2011 Term Loan Facility, due August 16, 2016
Long-term debt obligation
Basis of interest rate	LIBOR
Total debt	$ 78,094,000	$ 82,687,000
Effective rate of interest (as a percent)	2.18%