Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 2,080	$ 2,408
Preferred stock, no par value
Preferred stock, shares authorized	250,000	250,000
Preferred stock, shares issued
Common stock, no par value
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	17,403	17,178