Interest And Other Expense, Net (Schedule Of Interest And Other Expense, Net) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Interest And Other Expense, Net [Abstract]
Interest and other income	$ 854	$ 833	$ 1,536	$ 2,017
Interest and other expense	(6,266)	(6,337)	(21,759)	(18,516)
Loss on impairment of investments		(198)		(198)
Total interest and other expense, net	$ (5,412)	$ (5,702)	$ (20,223)	$ (16,697)