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Stock Plans (Summary of Total Compensation Recognized Related to Outstanding Stock Options) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Oct. 02, 2011
Sep. 30, 2012
Oct. 02, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total pre-tax stock-based compensation expense $ 5,101 $ 1,467 $ 15,352 $ 9,427
Cost of sales [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total pre-tax stock-based compensation expense 327 243 906 750
Research and development expenses [Member ]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total pre-tax stock-based compensation expense 186 138 547 432
Selling, general and administrative and other expenses [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total pre-tax stock-based compensation expense $ 4,588 $ 1,086 $ 13,899 $ 8,245