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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		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based compensation expense	$ 464	$ 352	$ 876	$ 680
Share-based compensation related tax benefit	$ 166	$ 125	$ 313	$ 242

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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