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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Consolidated Balance Sheets    
Trade accounts receivable, allowances (in dollars) $ 10,045 $ 7,250
Common shares, par value (in dollars per share) $ 0.10 $ 0.10
Common shares, shares authorized 50,000,000 50,000,000
Common shares, shares issued 18,465,444 17,726,645
Common shares, shares outstanding 18,465,444 17,726,645