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Share-Based Compensation Arrangements (Compensation Cost for Share-based Compensation Arrangements) (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
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based compensation expense	$ 528	$ 357	$ 1,404	$ 1,037
Share-based compensation related tax benefit	$ 188	$ 128	$ 501	$ 370

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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