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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		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Employee Stock Purchase Plan [Member]
Compensation expense for benefit plans	$ 376	$ 314	$ 738	$ 626
Income tax benefit from compensation expense for benefit plans	145	120	284	240
Restricted Stock [Member]
Compensation expense for benefit plans	456	404	937	782
Income tax benefit from compensation expense for benefit plans	$ 176	$ 155	$ 361	$ 300

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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