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Retirement Plans And Postretirement Benefits (Projected Future Postretirement 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
U.S. | Postretirement Costs  
Defined Benefit Plan Disclosure [Line Items]  
Expected employer contributions 855
2018 855
2019 800
2020 740
2021 678
2022 622
2023 - 2027 2,415
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
Foreign | Postretirement Costs  
Defined Benefit Plan Disclosure [Line Items]  
Expected employer contributions 912
2018 912
2019 907
2020 909
2021 900
2022 885
2023 - 2027 $ 4,518