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Goodwill And Other Intangible Assets (Schedule Of Intangible Assets With Determinable Useful Lives By Major Category) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Line Items]    
Gross Carrying Amount $ 142,300 $ 142,300
Accumulated Amortization (69,871) (58,446)
Net Carrying Amount 72,429 83,854
Trade Name [Member]    
Goodwill [Line Items]    
Gross Carrying Amount 22,500 22,500
Accumulated Amortization (11,932) (9,861)
Net Carrying Amount 10,568 12,639
Technological Know-How [Member]    
Goodwill [Line Items]    
Gross Carrying Amount 55,300 55,300
Accumulated Amortization (34,091) (29,112)
Net Carrying Amount 21,209 26,188
Customer Related Intangible [Member]    
Goodwill [Line Items]    
Gross Carrying Amount 64,500 64,500
Accumulated Amortization (23,848) (19,473)
Net Carrying Amount $ 40,652 $ 45,027