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Pension Plans and Other Postretirement Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2024
Retirement Benefits, Description [Abstract] |
Components of Net Periodic Benefit Cost | The Company uses a December 31 measurement date for its defined benefit pension and other postretirement benefit plans. The following table sets forth the components of net periodic benefit costs for the three and six months ended June 30 (dollars in thousands):
|  | Pension Benefits |  |  | Other Postretirement Benefits |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Three months ended June 30: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 3,947 |  |  | $ | 3,100 |  |  | $ | 661 |  |  | $ | 532 |
Interest cost |  |  | 8,217 |  |  |  | 8,521 |  |  |  | 1,726 |  |  |  | 1,909 |
Expected return on plan assets |  |  | (11,356 | ) |  |  | (10,922 | ) |  |  | (974 | ) |  |  | (891 | )
Curtailment loss |  |  | 169 |  |  |  | — |  |  |  | — |  |  |  | — |
Amortization of prior service cost (credit) |  |  | 126 |  |  |  | 123 |  |  |  | (263 | ) |  |  | (263 | )
Net loss recognition |  |  | 569 |  |  |  | 1,185 |  |  |  | 88 |  |  |  | (8 | )
Net periodic benefit cost |  | $ | 1,672 |  |  | $ | 2,007 |  |  | $ | 1,238 |  |  | $ | 1,279 |
Six months ended June 30: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 7,709 |  |  | $ | 7,994 |  |  | $ | 1,281 |  |  | $ | 1,350 |
Interest cost |  |  | 16,582 |  |  |  | 15,753 |  |  |  | 3,472 |  |  |  | 2,953 |
Expected return on plan assets |  |  | (22,584 | ) |  |  | (21,844 | ) |  |  | (1,948 | ) |  |  | (1,782 | )
Curtailment loss |  |  | 169 |  |  |  | — |  |  |  | — |  |  |  | — |
Amortization of prior service cost (credit) |  |  | 249 |  |  |  | 246 |  |  |  | (526 | ) |  |  | (526 | )
Net loss recognition |  |  | 1,359 |  |  |  | 2,024 |  |  |  | 179 |  |  |  | 525 |
Net periodic benefit cost |  | $ | 3,484 |  |  | $ | 4,173 |  |  | $ | 2,458 |  |  | $ | 2,520 |

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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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