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Share-Based Employee Compensation Plans and Other Compensation and Benefit Plans (Other Share-Based Compensation and Benefit Plans Activity) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Employee Stock Purchase Plan [Member]
Compensation expense for benefit plans	$ 401	$ 333	$ 1,139	$ 959
Income tax benefit from compensation expense for benefit plans	154	128	439	367
Restricted Stock [Member]
Compensation expense for benefit plans	583	422	1,520	1,204
Income tax benefit from compensation expense for benefit plans	$ 225	$ 162	$ 585	$ 461

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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