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Retirement Benefits (Net Periodic Benefit Cost For U.S. Employees) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Defined Benefit Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 2,276 $ 2,977
Interest cost 2,930 2,585
Expected return on plan assets (5,016) (3,670)
Amortization of net (income) loss 1,601 2,237
FAS 88 settlement charge 104  
Net periodic benefit cost 1,895 4,128
Post-Retirement Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 286 446
Interest cost 295 307
Prior service credit recognition (144) (33)
Amortization of net (income) loss   94
Net periodic benefit cost $ 437 $ 814