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Shareholders' Equity (Weighted Average Exercise Price And Fair Value Of Options Granted) (Details) (USD $)	12 Months Ended
	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

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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

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No definition available.

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