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Share-Based Compensation (Other Share-Based Compensation Activity) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Employee Stock Purchase Plan [Member]
Compensation expense for benefit plans	$ 413	$ 363
Income tax benefit from compensation expense for benefit plans	158	140
Restricted Stock [Member]
Compensation expense for benefit plans	527	480
Income tax benefit from compensation expense for benefit plans	$ 201	$ 185

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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