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Pension Plans and Postretirement Benefits (Tables) | 6 Months Ended
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Jun. 30, 2025
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Cost | Components of net periodic benefit cost included in net income were as follows:
|  | Pension Benefits |  | Other Benefits
|  | Three Months Ended June 30, |  | Six Months Ended June 30, |  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2025 |  | 2024
|  | (In thousands)
Service cost |  | $ | 2,897 |  |  | $ | 1,768 |  |  | $ | 4,580 |  |  | $ | 3,765 |  |  | $ | 384 |  |  | $ | 96 |  |  | $ | 469 |  |  | $ | 193 |
Interest cost |  | 13,782 |  |  | 11,133 |  |  | 25,235 |  |  | 22,763 |  |  | 869 |  |  | 503 |  |  | 1,401 |  |  | 1,008 |
Expected return on plan assets |  | (16,987) |  |  | (14,654) |  |  | (30,991) |  |  | (30,153) |  |  | (487) |  |  | (487) |  |  | (973) |  |  | (974) |
Amortization of prior service cost |  | 792 |  |  | 820 |  |  | 1,583 |  |  | 1,640 |  |  | 22 |  |  | 12 |  |  | 44 |  |  | 23 |
Net periodic benefit (income) / loss |  | $ | 484 |  |  | $ | (933) |  |  | $ | 407 |  |  | $ | (1,985) |  |  | $ | 788 |  |  | $ | 124 |  |  | $ | 941 |  |  | $ | 250 |

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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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