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Employee and Non-Employee Director Stock and Benefit Plans (Details 4) (Restricted share awards, USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Compensation expense
Share-based compensation expense	$ 12,400,000	$ 20,600,000	$ 15,400,000
Tax benefit related to share-based compensation expense	5,000,000	8,400,000	6,200,000
Restructuring charges
Compensation expense
Share-based compensation expense	500,000
Severance and restructuring charges
Compensation expense
Share-based compensation expense		$ 2,300,000	$ 400,000

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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