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Goodwill And Intangibles (Intangible Assets) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 72,739 | $ 74,188
Accumulated Amortization | (26,895) | (22,965)
Net Carrying Amount | 45,844 | 51,223
Patents |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 8,036 | 8,036
Accumulated Amortization | (5,893) | (5,486)
Net Carrying Amount | $ 2,143 | $ 2,550
Weighted- Average Lives | 8 years | 8 years
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 25,577 | $ 26,768
Accumulated Amortization | (5,603) | (5,584)
Net Carrying Amount | $ 19,974 | $ 21,184
Weighted- Average Lives | 11 years | 11 years
Production know-how |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 6,768 | $ 6,820
Accumulated Amortization | (5,595) | (5,035)
Net Carrying Amount | $ 1,173 | $ 1,785
Weighted- Average Lives | 8 years | 8 years
Technology, trademark and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 32,358 | $ 32,564
Accumulated Amortization | (9,804) | (6,860)
Net Carrying Amount | $ 22,554 | $ 25,704
Weighted- Average Lives | 7 years | 8 years

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