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Retirement Plans (Components Of Net Periodic Pension Benefit Cost (Income)) (Details) - UK Plan - United Kingdom Subsidiary [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 1,529	$ 1,336
Expected return on plan assets	(3,244)	(3,192)
Amortization of unrecognized loss	556	913
Net periodic pension cost (income)	$ (1,159)	$ (943)

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

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