Goodwill And Other Intangible Assets (Schedule Of Intangible Assets With Determinable Useful Lives By Major Category) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Intangible Assets
Gross Carrying Amount	$ 142,300	$ 142,300
Accumulated Amortization	(78,024)	(69,871)
Net Carrying Amount	64,276	72,429
Trade Name
Intangible Assets
Gross Carrying Amount	22,500	22,500
Accumulated Amortization	(13,445)	(11,932)
Net Carrying Amount	9,055	10,568
Technological Know-How
Intangible Assets
Gross Carrying Amount	55,300	55,300
Accumulated Amortization	(37,467)	(34,091)
Net Carrying Amount	17,833	21,209
Customer-Related Intangible
Intangible Assets
Gross Carrying Amount	64,500	64,500
Accumulated Amortization	(27,112)	(23,848)
Net Carrying Amount	$ 37,388	$ 40,652