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Pension Plan and Other Postretirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2025
Retirement Benefits [Abstract] |
Schedule of components of net periodic benefit costs for the pension plans and other postretirement benefits | The following tables list components of net periodic benefit costs for the pension plans and other postretirement benefits. The data listed under “pension plan” includes the qualified pension plan and the non-qualified SERP. The data listed under “other benefits” is for all other postretirement benefit plans.
| Pension Plan |  | Other Benefits
| Three Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Service cost | $ | 5,206 |  |  | $ | 5,648 |  |  | $ | 1,407 |  |  | $ | 1,521 |
Interest cost | 9,552 |  |  | 8,880 |  |  | 1,774 |  |  | 1,684 |
Expected return on plan assets | (12,792) |  |  | (13,234) |  |  | (3,197) |  |  | (2,988) |
Amortization of prior service cost | 132 |  |  | 131 |  |  | 38 |  |  | 38 |
Recognized net actuarial loss (gain) | 195 |  |  | 189 |  |  | (522) |  |  | (196) |
Net periodic benefit cost (credit) | $ | 2,293 |  |  | $ | 1,614 |  |  | $ | (500) |  |  | $ | 59 |
|  | Pension Plan |  | Other Benefits
|  | Nine Months Ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
| Service cost | $ | 15,620 |  |  | $ | 16,944 |  |  | $ | 4,223 |  |  | $ | 4,561 |
| Interest cost | 28,658 |  |  | 26,642 |  |  | 5,320 |  |  | 5,052 |
| Expected return on plan assets | (38,378) |  |  | (39,706) |  |  | (9,591) |  |  | (8,962) |
| Amortization of prior service cost | 394 |  |  | 393 |  |  | 116 |  |  | 116 |
| Recognized net actuarial loss (gain) | 583 |  |  | 567 |  |  | (1,566) |  |  | (592) |
| Net periodic benefit cost (credit) | $ | 6,877 |  |  | $ | 4,840 |  |  | $ | (1,498) |  |  | $ | 175 |

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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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