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Inventories (Details) (USD $)
Jul. 03, 2011
Dec. 31, 2010
Inventories [Abstract]    
Raw materials $ 40,200,000 $ 34,900,000
Work-in-process 7,500,000 6,400,000
Finished goods 29,300,000 25,800,000
Packaging and supplies 20,700,000 19,400,000
Total inventories $ 97,731,000 $ 86,464,000