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Non-pension Post-retirement Benefits (Anticipated Benefit Payments) (Details) - Non-pension Post-retirement Benefit Plans
$ in Thousands
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 4,259
2019 4,183
2020 4,118
2021 3,992
2022 3,983
2023-2027 17,221
U.S. Plans  
Defined Benefit Plan Disclosure [Line Items]  
2018 4,098
2019 4,024
2020 3,965
2021 3,850
2022 3,853
2023-2027 16,848
Non-U.S. Plans  
Defined Benefit Plan Disclosure [Line Items]  
2018 161
2019 159
2020 153
2021 142
2022 130
2023-2027 $ 373