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Equity Compensation (Stock-Based Compensation Expense And Related Income Tax Benefit Recognized In Condensed Consolidated Statements Of Income) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Equity Compensation [Abstract]
Stock-based compensation expense	$ 4,166	$ 3,708	$ 12,838	$ 12,707
Income tax (benefit)	$ (1,604)	$ (1,428)	$ (4,943)	$ (4,893)

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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