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Stock-Based Compensation (Details) (USD $)	3 Months Ended		9 Months Ended
Stock-Based Compensation (Details) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Share-based Compensation [Abstract]
Stock compensation expense	$ 1,000,000	$ 2,000,000	$ 6,000,000	$ 10,000,000
Stock-based compensation	1,302,000	4,312,000	6,700,000	12,387,000
Shares withheld for taxes	(950,000)	(1,616,000)	(1,170,000)	(1,707,000)
Capital surplus increase	$ 352,000	$ 2,696,000	$ 5,530,000	$ 10,680,000

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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