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Equity-Based Compensation (Schedule Of Compensation Expense Recognized From Change In Fair Value And Vesting Of Performance Stock Units) (Details) (Performance Stock Units [Member], USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Performance Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance stock unit compensation expense	$ (1,026)	$ 59	$ (1,974)	$ 42

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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