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Equity Compensation (Schedule Of Stock-Based Compensation Expense And Related Income Tax Benefit Recognized In Condensed Consolidated Statements Of Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Equity Compensation [Abstract]
Stock-based compensation expense	$ 4,483	$ 3,914
Income tax (benefit)	$ (1,726)	$ (1,507)

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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