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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		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Compensation expense	$ 9,668	$ 10,939	$ 20,687	$ 22,775
Stock Options [Member]
Compensation expense	997	758	2,176	1,550
RSUs [Member]
Compensation expense	3,707	3,327	7,529	7,041
LTIP Award [Member]
Compensation expense	1,558	3,842	2,407	8,863
Cash-Equivalent Stock Awards [Member]
Compensation expense	$ 3,406	$ 3,012	$ 8,575	$ 5,321

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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