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Share-Based Compensation Arrangements (Compensation Cost for Share-based Compensation Arrangements) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based compensation expense	$ 1,962	$ 1,394	$ 909
Share-based compensation related tax benefit	$ 700	$ 497	$ 324

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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