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Retirement Plans (Components Of Net Periodic Pension Benefit Cost) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Domestic Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic pension cost (income) $ 100,000 $ 100,000 $ 100,000 $ 100,000
Foreign Plan [Member] | United Kingdom Subsidiary [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 2,045,000 2,124,000 4,144,000 4,169,000
Expected return on plan assets (3,490,000) (3,327,000) (7,071,000) (6,531,000)
Amortization of unrecognized loss 665,000 724,000 1,347,000 1,422,000
Net periodic pension cost (income) $ (780,000) $ (479,000) $ (1,580,000) $ (940,000)