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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income [Abstract]
Beginning balance, Unrealized loss on investments, net of tax			$ (171)
Beginning balance, Unrealized loss on derivatives instruments, net of tax			(2,070)
Beginning balance, Unrealized gain on cumulative translation adjustment			18,195
Unrealized gain on investments, net of tax expense of $51 and $84 in 2013 and $33 and $66 in 2012	86	56	142	111
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(3,601)	(2,684)	3,066	(2,329)
Less: reclassification adjustment for (gains) losses included in net income, net of tax (expense) benefit of ($698) and ($1,039) in 2012 and $840 and $1,365 in 2011	(834)	(872)	(1,485)	(3,194)
Translation Adjustment Functional to Reporting Currency, Net of Tax, Period Increase (Decrease)	9,418	9,221	(2,115)	4,548
Current-period other comprehensive income (loss), Unrealized (loss) gain on derivatives instruments, net of tax	(4,435)	(3,556)	1,581	(5,523)
Current-period other comprehensive income (loss), Unrealized gain (loss) on cumulative translation adjustment	9,418	9,221	(2,115)	4,548
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(1,485)
Ending balance, Unrealized loss on investments, net of tax	(29)		(29)
Ending balance, Unrealized loss on derivatives instruments, net of tax	(489)		(489)
Ending balance, Unrealized gain on cumulative translation adjustment	16,080		16,080
Accumulated Other Comprehensive Income, Net of Tax, Beginning Balance			15,954
Accumulated Other Comprehensive Income, Net of Tax, Ending Balance	15,562		15,562
Accumulated Other Comprehensive Income (Loss), before Tax	$ 1,093		$ 1,093