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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2011
Shareholders' Equity [Abstract] |
Summary Of Share Option Activity Under The Stock Option Plan |
|  | 2011 |  |  | 2010 |  |  | 2009 |
|  | Number of options |  |  | Weighted average exercise price |  |  | Number of options |  |  | Weighted average exercise price |  |  | Number of options |  |  | Weighted average exercise price |
Outstanding – beginning of the year |  |  | 1,635,305 |  |  | $ | 35.96 |  |  |  | 1,858,250 |  |  | $ | 35.24 |  |  |  | 2,454,851 |  |  | $ | 33.96 |
Granted |  |  | 63,300 |  |  |  | 50.74 |  |  |  | 28,000 |  |  |  | 52.23 |  |  |  | 58,500 |  |  |  | 50.33 |
Exercised |  |  | (226,965 | ) |  |  | 32.41 |  |  |  | (223,020 | ) |  |  | 32.53 |  |  |  | (619,451 | ) |  |  | 31.62 |
Forfeited |  |  | (20,750 | ) |  |  | 42.33 |  |  |  | (27,925 | ) |  |  | 31.91 |  |  |  | (35,650 | ) |  |  | 34.53 |
Outstanding – end of the year |  |  | 1,450,890 |  |  | $ | 37.07 |  |  |  | 1,635,305 |  |  | $ | 35.96 |  |  |  | 1,858,250 |  |  | $ | 35.24 |
Options exercisable at the end of the year |  |  | 1,292,806 |  |  | $ | 35.17 |  |  |  | 963,289 |  |  | $ | 34.70 |  |  |  | 586,626 |  |  | $ | 32.55 |
Summary Of Options Outstanding Separated Into Ranges Of Exercise Prices |
|  |  | Options outstanding |  |  | Options exercisable |
Exercise price |  |  | Number of options |  |  | Weighted average remaining contractual life (years) |  |  | Weighted average exercise price per share |  |  | Number of options |  |  | Weighted average exercise price per share |
| $ 33.10 - $63.85 |  |  |  | 1,450,890 |  |  | $ | 1.27 |  |  | $ | 37.07 |  |  |  | 1,292,806 |  |  | $ | 35.17 |
Compensation Expenses Before Tax |
|  | Year ended December 31, |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Cost of revenues |  | $ | 924 |  |  | $ | 2,353 |  |  | $ | 2,397 |
R&D and marketing expenses |  |  | 458 |  |  |  | 954 |  |  |  | 1,048 |
General and administration expenses |  |  | 614 |  |  |  | 1,904 |  |  |  | 1,689 |
|  | $ | 1,996 |  |  | $ | 5,211 |  |  | $ | 5,134 |
Weighted Average Exercise Price And Fair Value Of Options Granted |
|  | Less than market price |
|  | Year ended December 31, |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Weighted average exercise price per share |  | $ | 50.74 |  |  | $ | 52.23 |  |  | $ | 50.33 |
Weighted average fair value per share on grant date |  | $ | 12.12 |  |  | $ | 11.99 |  |  | $ | 16.61 |
Computation Of Basic And Diluted Net Earnings Per Share |
|  |  | Year ended December 31, 2011 |  |  |  | Year ended December 31, 2010 |  |  |  | Year ended December 31, 2009 |
|  |  | Net income to shareholders of ordinary shares |  |  |  | Weighted average number of shares (*) |  |  |  | Per Share amount |  |  |  | Net income to shareholders of ordinary shares |  |  |  | Weighted average number of shares (*) |  |  |  | Per Share amount |  |  |  | Net income to shareholders of ordinary shares |  |  |  | Weighted average number of shares (*) |  |  |  | Per Share amount |
Basic net earnings |  | $ | 90,288 |  |  |  | 42,764 |  |  | $ | 2.11 |  |  | $ | 183,498 |  |  |  | 42,645 |  |  | $ | 4.30 |  |  | $ | 214,947 |  |  |  | 42,305 |  |  | $ | 5.08 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee stock options |  |  | - |  |  |  | 367 |  |  |  |  |  |  |  | - |  |  |  | 572 |  |  |  |  |  |  |  | - |  |  |  | 678 |  |  |  |  |
Diluted net earnings |  | $ | 90,288 |  |  |  | 43,131 |  |  | $ | 2.09 |  |  | $ | 183,498 |  |  |  | 43,217 |  |  | $ | 4.25 |  |  | $ | 214,947 |  |  |  | 42,983 |  |  | $ | 5.00 |
(*) In thousands
Summary Of Stock Appreciation Rights Activity |
|  | Year ended December 31, 2011 |
|  | Number of options |  |  | Weighted average Exercise price per share |
Outstanding – beginning of the year |  |  | 30,000 |  |  | $ | 58.64 |
Granted |  |  | - |  |  |  | - |
Outstanding – end of the year |  |  | 30,000 |  |  | $ | 58.64 |
Rights vested at the end of the year |  |  | 20,250 |  |  | $ | 59.36 |

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