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Shareholders' Equity (Weighted Average Exercise Price And Fair Value Of Options Granted) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Shareholders' Equity [Abstract] |  |  |
Weighted average exercise price per share, Less than market price | $ 50.74 | $ 52.23 | $ 50.33
Weighted average fair value on grant date, Less than market price, per share | $ 12.12 | $ 11.99 | $ 16.61

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Less Than Market Share + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Fair Value On Grant Date Less Than Market Share + References No definition available. + Details
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- Details
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