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Retirement Plans And Postretirement Benefits (Projected Future Pension Plan Cash Flow By Year) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
U.S.  
Defined Benefit Plan Disclosure [Line Items]  
Expected employer contributions $ 4,542
2018 9,086
2019 9,053
2020 9,083
2021 9,116
2022 9,103
2023 - 2027 44,783
Foreign  
Defined Benefit Plan Disclosure [Line Items]  
Expected employer contributions 558
2018 864
2019 751
2020 743
2021 778
2022 771
2023 - 2027 $ 6,285