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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Line Items]      
Gross Carrying Amount $ 142,300 $ 142,300 $ 142,300
Accumulated Amortization (39,990) (33,414) (19,809)
Net Carrying Amount 102,310 108,886 122,491
Trade Name      
Goodwill [Line Items]      
Gross Carrying Amount 22,500 22,500 22,500
Accumulated Amortization (6,629) (5,512) (3,235)
Net Carrying Amount 15,871 16,988 19,265
Technological Know-How      
Goodwill [Line Items]      
Gross Carrying Amount 55,300 55,300 55,300
Accumulated Amortization (20,502) (17,265) (10,397)
Net Carrying Amount 34,798 38,035 44,903
Customer-Related Intangible      
Goodwill [Line Items]      
Gross Carrying Amount 64,500 64,500 64,500
Accumulated Amortization (12,859) (10,637) (6,177)
Net Carrying Amount $ 51,641 $ 53,863 $ 58,323