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Stock-Based Compensation (Details) (USD $)	3 Months Ended		6 Months Ended
Stock-Based Compensation (Details) (USD $)	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Share-based Compensation [Abstract]
Stock compensation expense	$ 3,000,000	$ 3,000,000	$ 5,000,000	$ 7,000,000
Stock-based compensation	2,744,000	4,723,000	5,398,000	8,076,000
Shares withheld for taxes	(92,000)	(83,000)	(220,000)	(92,000)
Capital surplus increase	$ 2,652,000	$ 4,640,000	$ 5,178,000	$ 7,984,000

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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