Goodwill And Other Intangible Assets (Schedule Of Intangible Assets With Determinable Useful Lives By Major Category) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Intangible Assets
Gross Carrying Amount	$ 142,300	$ 142,300
Accumulated Amortization	(61,371)	(58,446)
Net Carrying Amount	80,929	83,854
Trade Name
Intangible Assets
Gross Carrying Amount	22,500	22,500
Accumulated Amortization	(10,385)	(9,861)
Net Carrying Amount	12,115	12,639
Technological Know-How
Intangible Assets
Gross Carrying Amount	55,300	55,300
Accumulated Amortization	(30,416)	(29,112)
Net Carrying Amount	24,884	26,188
Customer-Related Intangible
Intangible Assets
Gross Carrying Amount	64,500	64,500
Accumulated Amortization	(20,570)	(19,473)
Net Carrying Amount	$ 43,930	$ 45,027