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Retirement Plans And Postretirement Benefits (One-Percentage Point Change In Assumed Health Care Cost Trend Rates) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
U.S.  
Defined Benefit Plan Disclosure [Line Items]  
One Percentage Point Increase, Effect on total service cost and interest cost components $ 2
One Percentage Point Increase, Effect on benefit obligations 28
One Percentage Point Decrease, Effect on total service cost and interest cost components (2)
One Percentage Point Decrease, Effect on benefit obligations (27)
Foreign  
Defined Benefit Plan Disclosure [Line Items]  
One Percentage Point Increase, Effect on total service cost and interest cost components 60
One Percentage Point Increase, Effect on benefit obligations 639
One Percentage Point Decrease, Effect on total service cost and interest cost components (50)
One Percentage Point Decrease, Effect on benefit obligations $ (546)