Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income [Abstract]
Beginning balance, Unrealized gain on investments, net of tax	$ 108
Beginning balance, Unrealized loss on derivatives instruments, net of tax	(179)
Beginning balance, Unrealized gain on cumulative translation adjustment	13,693
Unrealized (loss) gain on investments, net of tax (benefit) expense of ($32) in 2014 and $42 in 2013	(54)	72
Other Comprehensive (Loss) Income, Unrealized (Loss) Gain on Derivatives Arising During Period, Net of Tax	(253)	4,118
Less: reclassification adjustment for gains included in net income, net of tax (expense) benefit of ($47) in 2014 and $8 in 2013	(149)	(10)
Current-period other comprehensive income (loss), Unrealized gain (loss) on cumulative translation adjustment	1,279	(8,447)
Current-period other comprehensive income (loss), Unrealized (loss) gain on derivatives instruments, net of tax	(402)	4,108
Current-period other comprehensive income (loss), Unrealized gain (loss) on cumulative translation adjustment	1,279	(8,447)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(149)
Ending balance, Unrealized gain on investments, net of tax	54
Ending balance, Unrealized loss on derivatives instruments, net of tax	(581)
Ending balance, Unrealized gain on cumulative translation adjustment	14,972
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	13,622
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	14,445
Accumulated Other Comprehensive Income, before Tax	$ 972