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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Statement Of Financial Position [Abstract]
Accounts receivable, reserves (in dollars)	$ 1,849	$ 2,625
Preferred shares, no par value
Preferred shares, issued	0	0
Common shares, no par value
Common shares, issued	28,853,000	28,803,000
Common shares, outstanding	28,221,000	28,483,000
Common shares held in treasury, shares	632,000	320,000

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