Goodwill And Other Intangible Assets (Schedule Of Intangible Assets With Determinable Useful Lives By Major Category) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Intangible Assets
Gross Carrying Amount	$ 142,300	$ 142,300
Accumulated Amortization	(67,129)	(58,446)
Net Carrying Amount	75,171	83,854
Trade Name
Intangible Assets
Gross Carrying Amount	22,500	22,500
Accumulated Amortization	(11,425)	(9,861)
Net Carrying Amount	11,075	12,639
Technological Know-How
Intangible Assets
Gross Carrying Amount	55,300	55,300
Accumulated Amortization	(32,945)	(29,112)
Net Carrying Amount	22,355	26,188
Customer-Related Intangible
Intangible Assets
Gross Carrying Amount	64,500	64,500
Accumulated Amortization	(22,759)	(19,473)
Net Carrying Amount	$ 41,741	$ 45,027