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Employee and Retiree Benefit Plans - Schedule of Components of Net Periodic Benefit Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | $ 1,865 | $ 1,683
Interest cost | 7,752 | 8,398
Expected return on plan assets | (8,792) | (8,871)
Estimated defined contribution provision | 70 | 60
Amortization of prior service cost (credit) | 432 | 491
Recognized actuarial (gain) loss | 1,644 | 1,891
Total net periodic benefit cost (credit) | 2,971 | 3,652
Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 102 | 84
Interest cost | 750 | 708
Expected return on plan assets | 0 | 0
Estimated defined contribution provision | 0 | 0
Amortization of prior service cost (credit) | (133) | (133)
Recognized actuarial (gain) loss | (387) | (1,056)
Total net periodic benefit cost (credit) | $ 332 | $ (397)

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