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Retirement Benefit Plans (Schedule of Expected Benefit Payments) (Details) $ in Thousands | Dec. 31, 2020 USD ($)
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Pension Plan |
Defined Benefit Plan Disclosure [Line Items] |
2021 | $ 1,219
2022 | 1,273
2023 | 1,291
2024 | 1,300
2025 | 1,309
Years 2026 through 2030 | 6,365
Supplemental Employee Retirement Plan |
Defined Benefit Plan Disclosure [Line Items] |
2021 | 360
2022 | 464
2023 | 469
2024 | 503
2025 | 575
Years 2026 through 2030 | $ 3,702

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