Goodwill And Other Intangible Assets (Schedule Of Intangible Assets With Determinable Useful Lives By Major Category) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Gross Carrying Amount	$ 142,300	$ 142,300
Accumulated Amortization	(58,446)	(46,294)
Net Carrying Amount	83,854	96,006
Trade Name [Member]
Goodwill [Line Items]
Gross Carrying Amount	22,500	22,500
Accumulated Amortization	(9,861)	(7,721)
Net Carrying Amount	12,639	14,779
Technological Know-How [Member]
Goodwill [Line Items]
Gross Carrying Amount	55,300	55,300
Accumulated Amortization	(29,112)	(23,503)
Net Carrying Amount	26,188	31,797
Customer Related Intangible [Member]
Goodwill [Line Items]
Gross Carrying Amount	64,500	64,500
Accumulated Amortization	(19,473)	(15,070)
Net Carrying Amount	$ 45,027	$ 49,430