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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $) In Thousands, except Per Share data	Sep. 30, 2011	Dec. 31, 2010
Accounts receivable, reserves	$ 1,612	$ 2,013
Preferred shares, without par value	$ 0	$ 0
Preferred shares, authorized	5,000	5,000
Preferred shares, issued	0	0
Common shares, without par value	$ 0	$ 0
Common shares, authorized	60,000	60,000
Common shares, issued	26,451	25,994
Common shares, outstanding	25,576	25,393
Common shares held in treasury, shares	875	601

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