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Geographic Information And Selected Statements Of Income Data (Summary Of Financial Income, Net) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Amortization of marketable securities premium and accretion of discount, net $ 28,092 $ 14,428 $ 8,414
Financial income, net 39,023 30,164 32,058
Financial Income [Member]
      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Interest income 68,351 53,567 41,346
Realized gain (loss) on sale of marketable securities 672 974  
Foreign currency re-measurement gain and others 14   2,061
Total financial income 69,037 54,541 43,407
Financial Expense [Member]
      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Realized gain (loss) on sale of marketable securities     1,896
Amortization of marketable securities premium and accretion of discount, net 28,092 14,428 8,414
Foreign currency re-measurement loss   2,808  
Others 1,922 7,141 1,039
Total financial expense $ 30,014 $ 24,377 $ 11,349