Accumulated Other Comprehensive Income (Schedule Of AOCI) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	$ (9,233)	$ (53,842)
Other comprehensive income (loss) before reclassifications	2,022	(7,653)
Gains reclassified from accumulated other comprehensive income	(5,796)	1,936
Balance end of period	202,722	(1,365)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(41,791)	(36,470)
Balance end of period	(45,565)	(42,187)
Unrealized (Loss) Gain on Investments, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(157)	(22)
Other comprehensive income (loss) before reclassifications	295	187
Gains reclassified from accumulated other comprehensive income	0	0
Balance end of period	138	165
Unrealized Gain (Loss) on Derivative Instruments, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	7,589	(5,219)
Other comprehensive income (loss) before reclassifications	10,451	7,514
Gains reclassified from accumulated other comprehensive income	(5,796)	1,936
Balance end of period	12,244	4,231
Unrealized (Loss) Gain on Net Investment Hedge, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(394)	(4,311)
Other comprehensive income (loss) before reclassifications	3,507	2,818
Gains reclassified from accumulated other comprehensive income	0	0
Balance end of period	3,113	(1,493)
Cumulative Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(48,829)	(26,918)
Other comprehensive income (loss) before reclassifications	(12,231)	(18,172)
Gains reclassified from accumulated other comprehensive income	0	0
Balance end of period	$ (61,060)	$ (45,090)