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Summary of Significant Accounting Policies (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Employee Share-based Compensation Awards
Pretax compensation expense	$ 17,537	$ 19,746	$ 21,861
Income tax benefits	$ 6,976	$ 7,968	$ 8,915

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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