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Pension (Anticipated Benefit Payments) (Details) - Pension Plan
$ in Thousands
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 21,986
2019 21,772
2020 22,035
2021 22,862
2022 23,212
2023-2027 120,075
U.S. Plans  
Defined Benefit Plan Disclosure [Line Items]  
2018 19,838
2019 19,765
2020 19,842
2021 20,304
2022 20,525
2023-2027 104,932
Non-U.S. Plans  
Defined Benefit Plan Disclosure [Line Items]  
2018 2,148
2019 2,007
2020 2,193
2021 2,558
2022 2,687
2023-2027 $ 15,143