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Employee and Retiree Benefit Plans - Components of Net Periodic Benefit Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1,683 $ 1,706 $ 5,049 $ 5,118
Interest cost 8,495 8,398 25,375 25,182
Expected return on plan assets (8,967) (8,366) (26,791) (25,082)
Estimated defined contribution provision 62 54 184 163
Amortization of prior service (credit) cost 492 579 1,475 1,737
Recognized actuarial (gain) loss 1,918 2,363 5,723 7,084
Total net periodic benefit expense 3,683 4,734 11,015 14,202
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 84 135 252 405
Interest cost 708 782 2,124 2,346
Expected return on plan assets 0 0 0 0
Estimated defined contribution provision 0 0 0 0
Amortization of prior service (credit) cost (133) (133) (399) (399)
Recognized actuarial (gain) loss (1,057) (812) (3,170) (2,436)
Total net periodic benefit expense $ (398) $ (28) $ (1,193) $ (84)