Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Allowance for doubtful accounts	$ 392	$ 623
Preferred stock, par value per share	$ 0.10	$ 0.10
Preferred stock, shares authorized	400,000	400,000
Preferred stock, shares issued
Common stock, par value per share	$ 0.10	$ 0.10
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	31,092,782	30,766,730
Treasury stock, shares	2,380,634	2,310,634