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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Consolidated Balance Sheets [Abstract]    
Allowance for doubtful accounts, accounts receivable $ 1,094 $ 586
Preferred shares, par value $ 0.10 $ 0.10
Preferred shares, shares authorized 5,000 5,000
Preferred shares, issued 0 0
Common shares, par value $ 0.10 $ 0.10
Common shares, shares authorized 145,000 145,000
Common shares, issued 57,902 61,196
Common shares, outstanding 57,791 61,085
Treasury shares, shares 111 111