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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data
Sep. 30, 2011
Dec. 31, 2010
Condensed Consolidated Balance Sheets [Abstract]  
Allowance for doubtful accounts, accounts receivable$ 552$ 586
Property, plant and equipment, accumulated depreciation$ 318,987$ 302,944
Preferred shares, par value$ 0.10$ 0.10
Preferred shares, shares authorized5,0005,000
Preferred shares, issued00
Common shares, par value$ 0.10$ 0.10
Common shares, shares authorized145,000145,000
Common shares, issued58,03561,196
Common shares, outstanding57,92461,085
Treasury shares, shares111111