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Stockholders’ Equity And Stock-Based Compensation (Schedule Of Weighted Average Grant Date Fair Value Of Purchase Rights Granted Under Employee Stock Purchase Plan) (Details) (Employee Stock Purchase Plan [Member], USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares	1,122,483	940,703	1,011,765
Weighted average fair value	$ 5.93	$ 6.56	$ 4.35

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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