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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, 2017
Dec. 31, 2016
Goodwill [Line Items]    
Gross Carrying Amount $ 142,300 $ 142,300
Accumulated Amortization & Impairment (23,279) (19,809)
Net Carrying Amount 119,021 122,491
Trade Name    
Goodwill [Line Items]    
Gross Carrying Amount 22,500 22,500
Accumulated Amortization & Impairment (3,811) (3,235)
Net Carrying Amount 18,689 19,265
Technological Know-How    
Goodwill [Line Items]    
Gross Carrying Amount 55,300 55,300
Accumulated Amortization & Impairment (12,173) (10,397)
Net Carrying Amount 43,127 44,903
Customer-Related Intangible    
Goodwill [Line Items]    
Gross Carrying Amount 64,500 64,500
Accumulated Amortization & Impairment (7,295) (6,177)
Net Carrying Amount $ 57,205 $ 58,323