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Postretirement benefits (Tables) | 6 Months Ended
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Jun. 30, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Components of net periodic benefit income | Postretirement benefit income is included in other income on the consolidated statements of comprehensive income and consisted of the following components:
|  | Quarter Ended June 30, |  | Six Months Ended June 30,
(in thousands) |  | 2022 |  | 2021 |  | 2022 |  | 2021
Interest cost |  | $ | 280 |  |  | $ | 242 |  |  | $ | 561 |  |  | $ | 484 |
Expected return on plan assets |  | (1,866) |  |  | (1,875) |  |  | (3,731) |  |  | (3,748) |
Amortization of prior service credit |  | (355) |  |  | (355) |  |  | (711) |  |  | (711) |
Amortization of net actuarial losses |  | 225 |  |  | 407 |  |  | 450 |  |  | 814 |
Net periodic benefit income |  | $ | (1,716) |  |  | $ | (1,581) |  |  | $ | (3,431) |  |  | $ | (3,161) |

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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=123447040&loc=d3e1928-114920 + Details
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