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Retirement Benefit Plans (Fair Value Hierarchy) (Details) - Pension Plan - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Fair value of each major category of U.S. plan assets $ 37,364 $ 34,954 $ 38,527
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of each major category of U.S. plan assets 37,364 34,954  
Level 1 | U.S. equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of each major category of U.S. plan assets 16,862 14,834  
Level 1 | Non-U.S. equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of each major category of U.S. plan assets 7,482 6,790  
Level 1 | Fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of each major category of U.S. plan assets 12,854 13,169  
Level 1 | Money market      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of each major category of U.S. plan assets $ 166 $ 161