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Retirement Benefit Plans (Net Periodic Benefit Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost $ 1,105 $ 1,002
Expected return on plan assets (2,707) (2,568)
Amortization of actuarial loss 543 718
Amortization of prior service credit 58 59
Net periodic benefit expense (1,001) (789)
Other Postretirement Benefits Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 12 13
Interest cost 38 27
Amortization of actuarial loss 64 19
Amortization of prior service credit (52) (54)
Net periodic benefit expense $ 62 $ 5