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Retirement Benefits (Tables)	9 Months Ended
Retirement Benefits (Tables)	Sep. 30, 2020
Defined Benefit Pension Plan [Member]
Net Periodic Benefit Cost For U.S. Employees	Pension Benefits Three Months Ended Nine Months Ended September 30, September 30, (Dollars in thousands) 2020 2019 2020 2019 Service cost $ 2,040 $ 2,064 $ 8,092 $ 6,616 Interest cost 2,562 2,928 7,608 8,788 Expected return on plan assets (5,197) (4,492) (15,591) (14,523) Amortization of net (income) loss 2,462 1,909 6,137 5,111 FAS 88 settlement charge 871 102 871 309 Net periodic benefit cost $ 2,738 $ 2,511 $ 7,117 $ 6,301
Post-Retirement Plan [Member]
Net Periodic Benefit Cost For U.S. Employees	Other Benefits Three Months Ended Nine Months Ended September 30, September 30, (Dollars in thousands) 2020 2019 2020 2019 Service cost $ 311 $ 245 $ 763 $ 818 Interest cost 215 245 644 835 Amortization of prior service cost (177) (144) (401) (433) Amortization of net (income) loss - (39) - (39) Net periodic benefit cost $ 349 $ 307 $ 1,006 $ 1,181