Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 4,164	$ 4,098
Preferred stock, no par value
Preferred stock, shares authorized	250	250
Preferred stock, shares issued	0	0
Common stock, no par value
Common stock, shares authorized	50,000	50,000
Common stock, shares issued	17,166	16,571