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Retirement Benefit Plans (Schedule of Expected Benefit Payments) (Details) $ in Thousands | Dec. 31, 2019 USD ($)
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Pension Plan |
Defined Benefit Plan Disclosure [Line Items] |
2020 | $ 1,152
2021 | 1,237
2022 | 1,267
2023 | 1,286
2024 | 1,294
Years 2025 through 2029 | 6,407
Supplemental Employee Retirement Plan |
Defined Benefit Plan Disclosure [Line Items] |
2020 | 1,205
2021 | 350
2022 | 450
2023 | 453
2024 | 480
Years 2025 through 2029 | $ 3,258

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