Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 1,780	$ 1,885
Preferred stock, shares authorized	250	250
Common stock, shares authorized	50,000	50,000
Common stock, shares issued	17,964	17,448