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Goodwill And Intangibles (Intangible Assets) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 45,666 $ 45,369
Accumulated Amortization (17,774) (16,580)
Net Carrying Amount 27,892 28,789
Patents    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 8,114 8,114
Accumulated Amortization (5,015) (4,926)
Net Carrying Amount $ 3,099 $ 3,188
Weighted- Average Lives 7 years 7 years
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 12,777 $ 12,727
Accumulated Amortization (3,914) (3,621)
Net Carrying Amount $ 8,863 $ 9,106
Weighted- Average Lives 9 years 9 years
Production know-how    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 6,641 $ 6,618
Accumulated Amortization (4,305) (4,093)
Net Carrying Amount $ 2,336 $ 2,525
Weighted- Average Lives 8 years 8 years
Technology, trademark and tradename    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 18,134 $ 17,910
Accumulated Amortization (4,540) (3,940)
Net Carrying Amount $ 13,594 $ 13,970
Weighted- Average Lives 8 years 8 years