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