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Retirement Plans (Components Of Net Periodic Pension Benefit Cost) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
UNITED STATES        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic pension cost (income) $ 100,000 $ 100,000 $ 200,000 $ 200,000
UK Plan | United Kingdom Subsidiary [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 1,613,000 1,925,000 4,765,000 5,968,000
Expected return on plan assets (3,030,000) (2,941,000) (8,949,000) (9,121,000)
Amortization of unrecognized loss 602,000 566,000 1,778,000 1,756,000
Net periodic pension cost (income) $ (815,000) $ (450,000) $ (2,406,000) $ (1,397,000)