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Retirement Plans (Components Of Net Periodic Pension Benefit Cost) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension cost (income)	$ 100,000	$ 100,000	$ 100,000	$ 100,000
UK Plan | United Kingdom Subsidiary [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	2,004,000	2,045,000	4,043,000	4,144,000
Expected return on plan assets	(3,064,000)	(3,490,000)	(6,180,000)	(7,071,000)
Amortization of unrecognized loss	590,000	665,000	1,190,000	1,347,000
Net periodic pension cost (income)	$ (470,000)	$ (780,000)	$ (947,000)	$ (1,580,000)

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- Definition

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

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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 cost recognized for passage of time related to defined benefit plan.

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

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