Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Accumulated Other Comprehensive Income [Abstract]
Beginning balance, Unrealized loss on investments, net of tax			$ (287)
Beginning balance, Unrealized gain on derivatives instruments, net of tax			3,206
Beginning balance, Unrealized gain on cumulative translation adjustment			12,524
Current-period other comprehensive income (loss), Unrealized gain (loss) on investments, net of tax	56	(246)	111	(201)
Current-period other comprehensive income (loss), Unrealized (loss) gain on derivatives instruments, net of tax	(3,556)	5,267	(5,523)	4,644
Current-period other comprehensive income (loss), Unrealized gain (loss) on cumulative translation adjustment	9,221	(12,780)	4,548	799
Ending balance, Unrealized loss on investments, net of tax	(176)		(176)
Ending balance, Unrealized loss on derivatives instruments, net of tax	(2,317)		(2,317)
Ending balance, Unrealized gain on cumulative translation adjustment	$ 17,072		$ 17,072