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Retirement Plans (Components Of Net Periodic Pension Benefit Cost) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Domestic Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic pension cost (income) $ 100,000 $ 100,000 $ 200,000 $ 200,000
Foreign Plan [Member] | United Kingdom Subsidiary [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 1,959,000 2,162,000 6,103,000 6,331,000
Expected return on plan assets (3,344,000) (3,388,000) (10,415,000) (9,919,000)
Amortization of unrecognized loss 638,000 738,000 1,985,000 2,160,000
Net periodic pension cost (income) $ (747,000) $ (488,000) $ (2,327,000) $ (1,428,000)