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Retirement Benefits (Tables) | 6 Months Ended
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Jun. 30, 2020
Defined Benefit Pension Plan [Member] |
Net Periodic Benefit Cost For U.S. Employees |
Pension Benefits | Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
(Dollars in thousands) | 2020 |  | 2019 |  | 2020 |  | 2019
Service cost | $ | 2,041 |  | $ | 2,276 |  | $ | 6,052 |  | $ | 4,552
Interest cost |  | 2,563 |  |  | 2,930 |  |  | 5,046 |  |  | 5,860
Expected return on plan assets |  | (5,197) |  |  | (5,016) |  |  | (10,394) |  |  | (10,031)
Amortization of net (income) loss |  | 2,462 |  |  | 1,601 |  |  | 3,675 |  |  | 3,203
FAS 88 settlement charge |  | - |  |  | 104 |  |  | - |  |  | 208
Net periodic benefit cost | $ | 1,869 |  | $ | 1,895 |  | $ | 4,379 |  | $ | 3,792
Post-Retirement Plan [Member] |
Net Periodic Benefit Cost For U.S. Employees |
Other Benefits | Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
(Dollars in thousands) | 2020 |  | 2019 |  | 2020 |  | 2019
Service cost | $ | 311 |  | $ | 286 |  | $ | 452 |  | $ | 573
Interest cost |  | 215 |  |  | 295 |  |  | 429 |  |  | 590
Amortization of prior service cost |  | (176) |  |  | (144) |  |  | (224) |  |  | (289)
Net periodic benefit cost | $ | 350 |  | $ | 437 |  | $ | 657 |  | $ | 874

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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