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Retirement Plans (Tables) | 9 Months Ended
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Sep. 30, 2025
Retirement Benefits [Abstract] |
Components of Net Periodic Benefits Cost | The following table shows the components of net periodic benefit cost included in expense for the periods indicated.
| Three Months Ended September 30, |
| Pension Benefits |  |  | Other Post-Retirement Benefits |
(in thousands) | 2025 |  | 2024 |  |  | 2025 |  | 2024 |
Service cost | $ | 1,455 |  | $ | 1,900 |  |  | $ | 5 |  | $ | 7 |
Interest cost |  | 6,269 |  |  | 6,056 |  |  |  | 115 |  |  | 135 |
Expected return on plan assets |  | (11,263 | ) |  | (11,901 | ) |  |  | — |  |  | — |
Amortization of net (gain) or loss and prior service costs |  | 1,073 |  |  | 1,530 |  |  |  | (338 | ) |  | (215 | )
Net periodic benefit cost | $ | (2,466 | ) | $ | (2,415 | ) |  | $ | (218 | ) | $ | (73 | )
| Nine Months Ended September 30, |
| Pension Benefits |  |  | Other Post-Retirement Benefits |
($ in thousands) | 2025 |  | 2024 |  |  | 2025 |  | 2024 |
Service cost (benefit) | $ | 4,606 |  | $ | 5,806 |  |  | $ | 23 |  | $ | 25 |
Interest cost |  | 18,817 |  |  | 17,986 |  |  |  | 423 |  |  | 443 |
Expected return on plan assets |  | (33,797 | ) |  | (35,724 | ) |  |  | — |  |  | — |
Amortization of net (gain) or loss and prior service costs |  | 3,331 |  |  | 4,154 |  |  |  | (708 | ) |  | (585 | )
Net periodic benefit cost | $ | (7,043 | ) | $ | (7,778 | ) |  | $ | (262 | ) | $ | (117 | )

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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://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: 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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