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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, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial gain	$ (44)	$ (48)
Amortization of actuarial loss	(64)	(19)
Amortization of prior service credit	52	54
Transfers	0	126
Total recognized in other comprehensive loss (income)	$ (56)	$ 113

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