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Share-Based Compensation Plans (Summary of share-based compensation expense and related income tax benefit) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Share - Based Compensation Plans [Abstract]
Share-based compensation	$ 5,675	$ 5,678	$ 15,779	$ 15,252
Related income tax benefit	$ 113	$ 88	$ 301	$ 257

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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