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Inventories (Details) (USD $)
Apr. 01, 2012
Dec. 31, 2011
Inventories [Abstract]    
Raw materials $ 36,600,000 $ 38,500,000
Work-in-process 5,900,000 6,000,000
Finished goods 26,700,000 26,100,000
Packaging and supplies 20,400,000 20,200,000
Total inventories $ 89,556,000 $ 90,760,000