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Retirement Plans (Components Of Net Periodic Pension Benefit Cost (Income)) (Details) - United Kingdom Subsidiary [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 2,376	$ 1,529
Expected return on plan assets	(2,791)	(3,244)
Amortization of unrecognized loss	639	556
Net periodic pension cost (income)	$ 224	$ (1,159)

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- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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