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Stock-Based Compensation Compensation Expense and Related Tax Benefits (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based compensation expense	$ 2,372	$ 817	$ 3,473	$ 1,428
Tax benefit	(746)	(192)	(1,001)	(320)
Stock-based compensation expense, net of tax	$ 1,626	$ 625	$ 2,472	$ 1,108

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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