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Retirement Benefit Plans (Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial loss (gain)	$ (1,030)	$ 1,397
Amortization of actuarial loss	(422)	(484)
Amortization of prior service credit	(58)	(58)
Settlements	(873)	0
Total recognized in other comprehensive loss (income)	(2,383)	855
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial loss (gain)	46	(756)
Amortization of actuarial loss	(8)	(96)
Current year prior service credit	0	(325)
Amortization of prior service credit	80	64
Total recognized in other comprehensive loss (income)	$ 118	$ (1,113)

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Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount, before tax, of increase (decrease) to other comprehensive income from settlement and curtailment gain (loss) of defined benefit plan.

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Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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