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Retirement Benefit Plans (Fair Value Hierarchy) (Details) - Pension Plan - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]      
Fair value of each major category of U.S. plan assets $ 34,485 $ 44,009 $ 41,099
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of each major category of U.S. plan assets 34,485 44,009  
Level 1 | U.S. equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of each major category of U.S. plan assets 15,499 21,434  
Level 1 | Non-U.S. equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of each major category of U.S. plan assets 7,055 8,678  
Level 1 | Fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of each major category of U.S. plan assets 11,753 13,723  
Level 1 | Money market funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of each major category of U.S. plan assets $ 178 $ 174