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Share Based Compensation (Details 1) (USD $) In Thousands	3 Months Ended		9 Months Ended
Share Based Compensation (Details 1) (USD $) In Thousands	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Share based compensation expense and related tax benefit
Share-based compensation expense	$ 6,463	$ 4,525	$ 13,986	$ 11,413
Tax (expense) benefit	$ 2,182	$ 1,584	$ 4,815	$ 3,995

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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