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Retirement Benefits (Tables) | 3 Months Ended
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Mar. 31, 2021
Defined Benefit Pension Plan [Member] |
Net Periodic Benefit Cost For U.S. Employees |
Pension Benefits | Three Months Ended
| March 31,
(Dollars in thousands) | 2021 |  | 2020
Service cost | $ | 2,738 |  | $ | 4,011
Interest cost |  | 1,999 |  |  | 2,483
Expected return on plan assets |  | (5,580) |  |  | (5,197)
Amortization of net (income) loss |  | 2,730 |  |  | 1,213
Net periodic benefit cost | $ | 1,887 |  | $ | 2,510
Post-Retirement Plan [Member] |
Net Periodic Benefit Cost For U.S. Employees |
Other Benefits | Three Months Ended
| March 31,
(Dollars in thousands) | 2021 |  | 2020
Service cost | $ | 281 |  | $ | 141
Interest cost |  | 181 |  |  | 215
Amortization of prior service cost |  | (144) |  |  | (48)
Net periodic benefit cost | $ | 318 |  | $ | 308

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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + 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 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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