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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		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Performance Stock Units [Member]
Compensation expense recognized from the change in fair value and vesting of performance stock units awarded	$ 217	$ (378)	$ (949)	$ (18)

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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