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Retirement Benefit Plans (Expected Plan Benefit Payments) (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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Defined Benefit Plan Disclosure [Line Items] |
2019 | $ 22,921
2020 | 24,046
2021 | 25,175
2022 | 26,198
2023 | 27,114
2024-2028 | 153,505
Total | 278,959
Pension Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
2019 | 21,885
2020 | 23,009
2021 | 24,077
2022 | 25,168
2023 | 26,085
2024-2028 | 148,547
Total | 268,771
Other Post-Retirement Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
2019 | 1,036
2020 | 1,037
2021 | 1,098
2022 | 1,030
2023 | 1,029
2024-2028 | 4,958
Total | $ 10,188

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