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Retirement Benefits (Net Periodic Benefit Cost For U.S. Employees) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Defined Benefit Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 4,011 $ 2,276
Interest cost 2,483 2,930
Expected return on plan assets (5,197) (5,016)
Amortization of net (income) loss 1,213 1,601
FAS 88 settlement charge 104
Net periodic benefit cost 2,510 1,895
Post-Retirement Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 141 286
Interest cost 215 295
Amortization of prior service cost (48) (144)
Net periodic benefit cost $ 308 $ 437