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Retirement Benefit Plans (Other Changes in Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income) (Details) - Other Postretirement Benefits Plan - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]    
Current year actuarial (gain) loss $ (48) $ 194
Amortization of actuarial (loss) gain (19) 1
Amortization of prior service credit 54 59
Amortization of curtailment 0 31
Transfers 126 46
Total recognized in other comprehensive (income) loss $ 113 $ 331