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Statements Of Changes In Shareholders' Equity (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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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 |  |

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