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Financial Instruments And Derivatives (Schedule Of Carrying Amounts And Fair Values Of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 01, 2012
Dec. 31, 2011
Apr. 03, 2011
Dec. 31, 2010
Mar. 31, 2009
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Cash equivalents, Carrying Value $ 533,396 $ 573,736 $ 420,267 $ 397,737  
Convertible debt, Carrying Value 159,373 156,098      
Japan loan, Carrying Value         10,000
Carrying Value [Member]
         
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Cash equivalents, Carrying Value 361,942 412,493      
Marketable securities, Carrying Value 208,735 180,909      
Convertible debt, Carrying Value 159,373 [1] 156,098 [1]      
Japan loan, Carrying Value 4,861 6,431      
Fair Value [Member]
         
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Cash equivalents, Fair Value 361,942 412,493      
Marketable securities, Fair Value 208,735 180,909      
Convertible debt, Fair Value 595,175 [1] 485,925 [1]      
Japan loan, Fair Value $ 4,861 $ 6,431      
[1] The carrying value represents the bifurcated debt component only, while the fair value is based on quoted market prices for the convertible note which includes the equity conversion feature.