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Statements Of Changes In Shareholders' Equity (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Statements Of Changes In Shareholders' Equity [Abstract]      
Issuance of treasury shares under stock plans, ordinary shares 3,069,869 4,965,581 6,871,250
Issuance of treasury shares under stock plans, ordinary shares withheld for taxes 52,431 61,149 43,805
Treasury shares 5,591,687 5,650,169 7,814,140
Tax effect of reclassification adjustments to income on marketable securities $ 298 $ (244) $ (122)
Tax effect of other than temporary impairment on marketable securities   126 611
Tax effect of gain on sale of marketable securities previously impaired 363    
Tax effect of unrealized gain (losses) on marketable securities 372 988 4,805
Tax effect of accumulated unrealized gain (losses) on marketable securities   4,909 4,039
Tax effect of accumulated unrealized gains (losses) on marketable securities and forward contracts $ 3,876