Long-Term Debt (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Long-term debt obligation
Total debt	$ 94,938,000	$ 98,000,000
Less current maturities	16,844,000	15,313,000
Total long-term debt	78,094,000	82,687,000
2010 Revolving Credit Facility, due August 12, 2013
Long-term debt obligation
Basis of interest rate	LIBOR	LIBOR
Total debt		0
Remaining borrowing capacity			60,500,000
2011 Term Loan Facility, due August 16, 2016
Long-term debt obligation
Basis of interest rate	LIBOR	LIBOR
Total debt	94,938,000	98,000,000
Effective rate of interest (as a percent)	2.15%
2013 Revolving Credit Facility, due August 16, 2016
Long-term debt obligation
Basis of interest rate	Eurodollar rate	Eurodollar rate
Total debt	0
Remaining borrowing capacity	$ 72,500,000
Effective rate of interest (as a percent)	2.40%