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Goodwill And Other Intangible Assets (Schedule Of Intangible Assets With Determinable Useful Lives By Major Category) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Intangible Assets    
Gross Carrying Amount $ 142,300 $ 142,300
Accumulated Amortization (64,295) (58,446)
Net Carrying Amount 78,005 83,854
Trade Name    
Intangible Assets    
Gross Carrying Amount 22,500 22,500
Accumulated Amortization (10,909) (9,861)
Net Carrying Amount 11,591 12,639
Technological Know-How    
Intangible Assets    
Gross Carrying Amount 55,300 55,300
Accumulated Amortization (31,720) (29,112)
Net Carrying Amount 23,580 26,188
Customer-Related Intangible    
Intangible Assets    
Gross Carrying Amount 64,500 64,500
Accumulated Amortization (21,666) (19,473)
Net Carrying Amount $ 42,834 $ 45,027