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Components of Net Periodic Benefit Cost (Tables) | 6 Months Ended
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Jun. 30, 2024
Retirement Benefits [Abstract] |
Net Periodic (Benefit) Increase Cost | Net periodic (benefit) increase cost for pension benefits and other post-retirement benefits for the three and six months ended June 30, 2024 and 2023 includes the following components (in thousands):
|  | Three months ended June 30, |  | Six months ended June 30,
|  | Pension benefits |  | Other post-retirement benefits |  | Pension benefits |  | Other post-retirement benefits
|  | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Service cost |  | $ | — |  |  | — |  |  | 3 |  |  | 3 |  |  | $ | — |  |  | — |  |  | 6 |  |  | 6 |
Interest cost |  | 289 |  |  | 302 |  |  | 135 |  |  | 150 |  |  | 578 |  |  | 604 |  |  | 270 |  |  | 300 |
Expected return on plan assets |  | (778) |  |  | (706) |  |  | — |  |  | — |  |  | (1,556) |  |  | (1,412) |  |  | — |  |  | — |
Amortization of prior service cost |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of the net loss (gain) |  | 14 |  |  | 177 |  |  | (530) |  |  | (533) |  |  | 28 |  |  | 354 |  |  | (1,060) |  |  | (1,066) |
Net periodic (decrease) increase in benefit cost |  | $ | (475) |  |  | (227) |  |  | (392) |  |  | (380) |  |  | $ | (950) |  |  | (454) |  |  | (784) |  |  | (760) |

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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 -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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