Accumulated Other Comprehensive Income (Schedule Of AOCI) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	$ 177,825	$ (9,233)
Other comprehensive (loss) income before reclassifications	(13,707)	2,022
Gains (losses) reclassified from accumulated other comprehensive income	(2,036)	(5,796)
Balance end of period	441,115	202,722
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(46,182)	(41,791)
Balance end of period	(61,925)	(45,565)
Unrealized Gain (Loss) on Investments, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	110	(157)
Other comprehensive (loss) income before reclassifications	(408)	295
Gains (losses) reclassified from accumulated other comprehensive income	0	0
Balance end of period	(298)	138
Foreign Currency Exchange Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(736)	6,229
Other comprehensive (loss) income before reclassifications	(623)	6,458
Gains (losses) reclassified from accumulated other comprehensive income	(2,036)	(5,796)
Balance end of period	(3,395)	6,891
Euro-Denominated Notes
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	1,396	(394)
Other comprehensive (loss) income before reclassifications	(3,466)	3,507
Gains (losses) reclassified from accumulated other comprehensive income	0	0
Balance end of period	(2,070)	3,113
Cross Currency Swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	3,467	1,360
Other comprehensive (loss) income before reclassifications	(1,339)	3,993
Gains (losses) reclassified from accumulated other comprehensive income	0	0
Balance end of period	2,128	5,353
Cumulative Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(50,419)	(48,829)
Other comprehensive (loss) income before reclassifications	(7,871)	(12,231)
Gains (losses) reclassified from accumulated other comprehensive income	0	0
Balance end of period	$ (58,290)	$ (61,060)