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Employee Benefit Plans (Schedule Of Stock Related Compensation Expense Relating To The Stock Options, RSUs, LTIP And Cash Equivalent Awards) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 7,853	$ 12,490	$ 28,540	$ 35,265
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	967	706	3,143	2,256
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	2,698	3,174	10,227	10,215
LTIP Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	1,140	3,843	3,547	12,706
Cash-Equivalent Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 3,048	$ 4,767	$ 11,623	$ 10,088

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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