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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Sep. 29, 2012
Dec. 31, 2011
Statement of Financial Position [Abstract]    
Accounts receivable, allowances $ 1,938 $ 1,884
Fixed assets, accumulated depreciation $ 331,485 $ 328,648
Common stock, shares outstanding 68,676,060 67,820,798
Preferred stock, shares outstanding 0 0