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Selected Statements Of Operations Data (Schedule Of Net Earnings Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Selected Statements Of Operations Data [Abstract] |  |  |
Numerator for basic and diluted net earnings per share - income (loss) available to shareholders of Ordinary shares | $ (23,391) | $ (53,654) | $ 14,062
Denominator for basic net earnings per share - weighted average number of shares | 36,457,989 | 35,975,434 | 34,854,657
Employee stock options and RSU |  |  | 1,710,173
Denominator for diluted net earnings per share - adjusted weighted average number of shares | 36,457,989 | 35,975,434 | 36,564,830

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