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Retirement Plans (Components Of Net Periodic Pension Benefit Cost) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
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 1,556,000 2,004,000 3,152,000 4,043,000
Expected return on plan assets (2,922,000) (3,064,000) (5,919,000) (6,180,000)
Amortization of unrecognized loss 581,000 590,000 1,176,000 1,190,000
Net periodic pension cost (income) $ (785,000) $ (470,000) $ (1,591,000) $ (947,000)