Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Statement of Financial Position [Abstract]
Allowance for accounts receivable	$ 1,403	$ 1,490
Serial preferred stock, par value
Serial preferred stock, shares authorized	5,000,000	5,000,000
Serial preferred stock, shares issued
Common stock, shares authorized	60,000,000	60,000,000
Common stock, shares, issued	27,050,000	27,024,000
Treasury stock, shares	6,607,000	6,716,000