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Pensions and Other Postretirement Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 2021
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs | The composition of the net periodic benefit cost for the three months ended March 31, 2021 and 2020, was as follows:
| Pension plans | Other postretirement benefits
(in thousands) | 2021 | 2020 | 2021 | 2020
Components of net periodic benefit cost: |  |  |  |
Service cost | $ | 545 |  | $ | 580 |  | $ | 33 |  | $ | 50 |
Interest cost | 1,338 |  | 1,550 |  | 276 |  | 428 |
Expected return on assets | (1,606) |  | (1,723) |  | — |  | — |
Amortization of prior service cost/(credit) | 3 |  | 8 |  | (1,122) |  | (1,122) |
Amortization of net actuarial loss | 544 |  | 596 |  | 565 |  | 648 |
Net periodic benefit cost | $ | 824 |  | $ | 1,011 |  | $ | (248) |  | $ | 4 |

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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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