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Goodwill And Other Intangible Assets (Schedule Of Intangible Assets With Determinable Useful Lives By Major Category) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Intangible Assets    
Gross Carrying Amount $ 142,300 $ 142,300
Accumulated Amortization (72,613) (69,871)
Net Carrying Amount 69,687 72,429
Trade Name    
Intangible Assets    
Gross Carrying Amount 22,500 22,500
Accumulated Amortization (12,439) (11,932)
Net Carrying Amount 10,061 10,568
Technological Know-How    
Intangible Assets    
Gross Carrying Amount 55,300 55,300
Accumulated Amortization (35,237) (34,091)
Net Carrying Amount 20,063 21,209
Customer-Related Intangible    
Intangible Assets    
Gross Carrying Amount 64,500 64,500
Accumulated Amortization (24,937) (23,848)
Net Carrying Amount $ 39,563 $ 40,652