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Stock Incentive Plans And Stock Purchase Plan (Schedule Of Weighted Average Grant-Date Fair Values) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock Incentive Plans And Stock Purchase Plan [Abstract]
Number of Shares, Non-vested shares at January 1, 2011	955,449
Number of Shares, Awarded	427,152
Number of Shares, Forfeited	(15,279)
Number of Shares, Vested	(388,969)
Number of Shares, Non-vested shares at December 31, 2011	978,353	955,449
Weighted Average Fair Value, Non-vested shares at January 1, 2011	$ 50.08
Weighted Average Fair Value, Awarded	$ 70.99	$ 54.90	$ 41.74
Weighted Average Fair Value, Forfeited	$ 54.58
Weighted Average Fair Value, Vested	$ 48.84
Weighted Average Fair Value, Non-vested shares at December 31, 2011	$ 59.64	$ 50.08

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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