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Stock-Based Compensation (Stock-Based Compensation and Related Tax Benefit) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation [Abstract]
Total stock-based compensation	$ 942	$ 310	$ 92
Recognized tax benefit	(330)	(109)	(32)
Net expense recognized	$ 612	$ 201	$ 60

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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