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Retirement Benefits (Tables) | 3 Months Ended
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Mar. 31, 2019
Defined Benefit Pension Plan [Member] |
Net Periodic Benefit Cost For U.S. Employees |
Pension Benefits |  | Three Months Ended |
|  | March 31, |
(Dollars in thousands) |  | 2019 |  |  | 2018 |
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] |
Net Periodic Benefit Cost For U.S. Employees |
Other Benefits |  | Three Months Ended |
|  | March 31, |
(Dollars in thousands) |  | 2019 |  |  | 2018 |
Service cost |  | $ | 286 |  |  | $ | 446 |
Interest cost |  |  | 295 |  |  |  | 307 |
Amortization of prior service cost |  |  | (144 | ) |  |  | (33 | )
Amortization of net (income) loss |  |  | - |  |  |  | 94 |
Net periodic benefit cost |  | $ | 437 |  |  | $ | 814 |
(Some amounts may not reconcile due to rounding.) |  |  |  |  |  |  |  |

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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=108410482&loc=d3e1928-114920 + Details
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