Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 2,432	$ 2,408
Preferred stock, no par value
Preferred stock, shares authorized	250	250
Preferred stock, shares issued
Common stock, no par value
Common stock, shares authorized	50,000	50,000
Common stock, shares issued	17,461	17,178