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Stock-Based Compensation (Schedule Of Weighted-Average Fair Value Per Share) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock-Based Compensation [Abstract]
Options granted			$ 7.15
Restricted stock awards granted	$ 23.40	$ 23.76	$ 20.37
ESPP stock purchases	$ 5.27	$ 5.40	$ 3.42

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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