Goodwill And Other Intangible Assets (Schedule Of Intangible Assets With Determinable Useful Lives By Major Category) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Intangible Assets
Gross Carrying Amount	$ 142,300	$ 142,300
Accumulated Amortization	(49,399)	(46,294)
Net Carrying Amount	92,901	96,006
Trade Name
Intangible Assets
Gross Carrying Amount	22,500	22,500
Accumulated Amortization	(8,262)	(7,721)
Net Carrying Amount	14,238	14,779
Technological Know-How
Intangible Assets
Gross Carrying Amount	55,300	55,300
Accumulated Amortization	(24,964)	(23,503)
Net Carrying Amount	30,336	31,797
Customer-Related Intangible
Intangible Assets
Gross Carrying Amount	64,500	64,500
Accumulated Amortization	(16,173)	(15,070)
Net Carrying Amount	$ 48,327	$ 49,430