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Retirement Benefit Plans (Fair Value Hierarchy) (Details) - Pension Plan - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of each major category of U.S. plan assets | $ 30,128 | $ 34,485 | $ 44,009
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of each major category of U.S. plan assets | 30,128 | 34,485 |
Level 1 | Fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of each major category of U.S. plan assets | 29,866 | 11,753 |
Level 1 | Cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of each major category of U.S. plan assets | 81 | 0 |
Level 1 | Money market funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of each major category of U.S. plan assets | 181 | 178 |
Level 1 | U.S. equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of each major category of U.S. plan assets | 0 | 15,499 |
Level 1 | Non-U.S. equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of each major category of U.S. plan assets | $ 0 | $ 7,055 |

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