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Retirement Plans (Narrative) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) plan	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) plan	Jun. 30, 2020 USD ($)
UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Number of plans | plan	3		3
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]
Contributions to defined benefit pension plans			2,500,000
Anticipated additional contribution	2,500,000		2,500,000
Net periodic pension cost (income)	$ (951,000)	$ (785,000)	$ (1,894,000)	$ (1,591,000)

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