Accumulated Other Comprehensive Income (Schedule Of AOCI) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	$ 632,795	$ 177,825
Other comprehensive income (loss) before reclassifications	(3,964)	(13,707)
Gain (loss) reclassified from accumulated other comprehensive income	5,522	(2,036)
Balance end of period	755,460	441,115
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(53,615)	(46,182)
Balance end of period	(52,057)	(61,925)
Unrealized Gain (Loss) on Investments, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(272)	110
Other comprehensive income (loss) before reclassifications	153	(408)
Gain (loss) reclassified from accumulated other comprehensive income	0	0
Balance end of period	(119)	(298)
Unrealized Gain (Loss) on Cash Flow Hedges, Net of Tax, Foreign Currency Exchange Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(9,934)	(736)
Other comprehensive income (loss) before reclassifications	7,300	(623)
Gain (loss) reclassified from accumulated other comprehensive income	5,522	(2,036)
Balance end of period	2,888	(3,395)
Unrealized (Loss) Gain on Net Investment Hedges, Net of Tax, Euro-Denominated Notes
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(5,982)	1,396
Other comprehensive income (loss) before reclassifications	4,235	(3,466)
Gain (loss) reclassified from accumulated other comprehensive income	0	0
Balance end of period	(1,747)	(2,070)
Unrealized (Loss) Gain on Net Investment Hedges, Net of Tax, Cross Currency Swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(2,159)	3,467
Other comprehensive income (loss) before reclassifications	4,561	(1,339)
Gain (loss) reclassified from accumulated other comprehensive income	0	0
Balance end of period	2,402	2,128
Cumulative Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(35,268)	(50,419)
Other comprehensive income (loss) before reclassifications	(20,213)	(7,871)
Gain (loss) reclassified from accumulated other comprehensive income	0	0
Balance end of period	$ (55,481)	$ (58,290)