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Segment Information (Geographic Information) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 28, 2012
Sep. 30, 2011
Sep. 28, 2012
Sep. 30, 2011
Dec. 30, 2011
Geographic Information [Line Items]          
Net Sales $ 256,472 $ 227,347 $ 758,778 $ 679,689  
Long-Lived Assets 152,866   152,866   138,248
United States
         
Geographic Information [Line Items]          
Net Sales 111,426 102,750 332,048 303,565  
Long-Lived Assets 120,744   120,744   120,119
Other Countries [Member]
         
Geographic Information [Line Items]          
Net Sales 145,046 124,597 426,730 376,124  
Long-Lived Assets $ 32,122   $ 32,122   $ 18,129