Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016
Accumulated Other Comprehensive Income [Abstract]
Beginning balance, Unrealized (Loss) Gain on Investments, Net of Tax			$ (225)
Beginning balance, Unrealized Gain (Loss) on Derivative Instruments, Net of Tax			2,217
Beginning balance, Unrealized Gain (Loss) On Net Investment Hedge, Net Of Tax			1,894
Beginning balance, Cumulative Translation Adjustment			(46,151)
Other comprehensive income (loss) before reclassifications, Unrealized (Loss) Gain on Investments, Net of Tax	$ 9	$ (88)	334	$ (81)
Other comprehensive income (loss) before reclassifications, Unrealized Gain (Loss) on Derivative Instruments, Net of Tax	(129)	2,495	(1,570)	6,793
Other comprehensive income (loss) before reclassifications, Unrealized Gain (Loss) On Net Investment Hedge, Net Of Tax	(732)	(396)	(1,649)	340
Other comprehensive income (loss) before reclassifications, Cumulative Translation Adjustment	1,687	(13,859)	10,873	(26,793)
Other comprehensive income (loss) before reclassifications, Cumulative Translation Adjustment	(35,278)		(46,151)		$ (35,278)
Gains reclassified from accumulated other comprehensive income, Unrealized Gain (Loss) on Derivative Instruments, Net of Tax	(451)	$ (3,369)	(804)	$ (9,681)
Ending balance, Unrealized (Loss) Gain on Investments, Net of Tax	109		109
Ending balance, Unrealized Gain (Loss) on Derivative Instruments, Net of Tax	(157)		(157)
Ending balance, Unrealized Gain (Loss) On Net Investment Hedge, Net Of Tax	245		245
Ending balance, Cumulative Translation Adjustment	(35,278)		(35,278)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance			(42,265)
Accumulated Other Comprehensive Income, before Tax					$ 7,988
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(804)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	$ (35,081)		$ (35,081)