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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 [Abstract]    
Accounts and notes receivable, allowance for doubtful accounts and sales returns $ 3,539 $ 5,286
Common stock, no par value      
Common stock, shares authorized 150,000,000 150,000,000
Common stock, shares issued 32,057,281 31,883,173
Common stock, shares outstanding 32,057,281 31,883,173
Common stock held in trust for savings restoration plan, shares 61,577 60,986