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Retirement Benefits (Net Periodic Benefit Cost For U.S. Employees) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Defined Benefit Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2,064 $ 2,977 $ 6,616 $ 8,931
Interest cost 2,928 2,585 8,788 7,754
Expected return on plan assets (4,492) (3,670) (14,523) (11,011)
Amortization of net (income) loss 1,909 2,237 5,111 6,710
FAS 88 settlement charge 102 309
Net periodic benefit cost 2,511 4,129 6,301 12,384
Post-Retirement Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 245 446 818 1,339
Interest cost 245 307 835 920
Amortization of prior service cost (144) (33) (433) (98)
Amortization of net (income) loss (39) 94 (39) 282
Net periodic benefit cost $ 307 $ 814 $ 1,181 $ 2,443