Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Allowances for doubtful accounts	$ 1,648	$ 1,272
Common stock, par value
Common stock, shares authorized	60,000,000	60,000,000
Common stock shares, issued	41,329,538	41,140,538
Treasury stock, shares	4,008,963	4,008,963
Series B Preferred Stock
Preferred stock, shares outstanding