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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]    
Allowance for doubtful accounts, accounts receivable $ 1,438 $ 1,094
Property, plant and equipment, accumulated depreciation $ 319,228 $ 312,983
Preferred shares, par value $ 0.10 $ 0.10
Preferred shares, shares authorized 5,000,000 5,000,000
Preferred shares, issued 0 0
Common shares, par value $ 0.10 $ 0.10
Common shares, shares authorized 145,000,000 145,000,000
Common shares, issued 57,969,000 57,902,000
Common shares, outstanding 57,858,000 57,791,000
Treasury shares, shares 111,000 111,000