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Stock-Based Compensation Compensation Expense and Related Tax Benefits (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based compensation expense	$ 979	$ 913	$ 4,186	$ 3,963
Tax benefit	(272)	(245)	(1,183)	(1,061)
Stock-based compensation expense, net of tax	$ 707	$ 668	$ 3,003	$ 2,902

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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