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Share-Based Compensation (Stock Option Activity) (Details) (Stock Option [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Stock Option [Member]
Compensation expense for benefit plans	$ 4,657	$ 4,380
Income tax benefit from compensation expense for benefit plans	$ 1,777	$ 1,686
Weighted-average grant date fair value of options awarded	$ 30.01	$ 24.30

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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