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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
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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

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