Accumulated Other Comprehensive Income (Schedule Of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	$ 177,825	$ (9,233)
Other comprehensive (loss) income before reclassifications	(7,963)	2,938
Gains (losses) reclassified from accumulated other comprehensive income	(1,101)	(1,162)
Balance end of period	108,055	51,870
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(46,182)	(41,791)
Balance end of period	(55,246)	(40,015)
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	(279)	407
Gains (losses) reclassified from accumulated other comprehensive income	0	0
Balance end of period	(169)	250
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	9,426	1,043
Gains (losses) reclassified from accumulated other comprehensive income	(1,101)	(1,162)
Balance end of period	7,589	6,110
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	1,047	1,480
Gains (losses) reclassified from accumulated other comprehensive income	0	0
Balance end of period	2,443	1,086
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	4,049	1,431
Gains (losses) reclassified from accumulated other comprehensive income	0	0
Balance end of period	7,516	2,791
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	(22,206)	(1,423)
Gains (losses) reclassified from accumulated other comprehensive income	0	0
Balance end of period	$ (72,625)	$ (50,252)