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Stock-Based Compensation (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Stock-based employee compensation expense
Stock-based compensation expense	$ 357	$ 271	$ 798	$ 646
Tax	(138)	(105)	(309)	(250)
Stock-based compensation expense, net of tax	$ 219	$ 166	$ 489	$ 396

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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