| 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, | | 2026 | | 2025 | | 2026 | | 2025 | | Service cost | $ | 5,783 | | | $ | 5,206 | | | $ | 1,330 | | | $ | 1,407 | | | Interest cost | 10,232 | | | 9,552 | | | 1,642 | | | 1,774 | | | Expected return on plan assets | (14,276) | | | (12,792) | | | (3,679) | | | (3,197) | | | Amortization of prior service cost | 132 | | | 132 | | | 38 | | | 38 | | Recognized net actuarial loss (gain) | 605 | | | 195 | | | (962) | | | (522) | | | Net periodic benefit cost (credit) | $ | 2,476 | | | $ | 2,293 | | | $ | (1,631) | | | $ | (500) | |
| | | | | | | | | | | | | | | | | | | | | | | | | Pension Plan | | Other Benefits | | Nine Months Ended September 30, | | 2026 | | 2025 | | 2026 | | 2025 | | Service cost | $ | 17,347 | | | $ | 15,620 | | | $ | 3,991 | | | $ | 4,223 | | | Interest cost | 30,695 | | | 28,658 | | | 4,925 | | | 5,320 | | | Expected return on plan assets | (42,827) | | | (38,378) | | | (11,038) | | | (9,591) | | | Amortization of prior service cost | 394 | | | 394 | | | 116 | | | 116 | | Recognized net actuarial loss (gain) | 1,817 | | | 583 | | | (2,887) | | | (1,566) | | | Net periodic benefit cost (credit) | $ | 7,426 | | | $ | 6,877 | | | $ | (4,893) | | | $ | (1,498) | |
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