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Retirement Plans (Components Of Net Periodic Pension Benefit Cost) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension cost (income)	$ 100,000	$ 100,000
UK Plan | United Kingdom Subsidiary [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	2,039,000	2,099,000
Expected return on plan assets	(3,116,000)	(3,581,000)
Amortization of unrecognized loss	600,000	682,000
Net periodic pension cost (income)	$ (477,000)	$ (800,000)

X

- Definition

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

+ References

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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