Retirement Benefit Plans (Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Loss (Income)) (Details) - Pension Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial (gain) loss	$ (3,793)	$ 667
Amortization of actuarial loss	(718)	(597)
Amortization of prior service cost	(59)	(58)
Total recognized in other comprehensive (income) loss	$ (4,570)	$ 12