v3.26.3
Employee and Retiree Benefit Plans - Schedule of Components of Net Periodic Benefit Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1,865 $ 1,683 $ 5,595 $ 5,049
Interest cost 7,744 8,495 23,248 25,375
Expected return on plan assets (8,786) (8,967) (26,370) (26,791)
Estimated defined contribution provision 69 62 209 184
Amortization of prior service cost (credit) 432 492 1,296 1,475
Recognized actuarial (gain) loss 1,643 1,918 4,931 5,723
Total net periodic benefit cost (credit) 2,967 3,683 8,909 11,015
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 102 84 306 252
Interest cost 750 708 2,250 2,124
Expected return on plan assets 0 0 0 0
Estimated defined contribution provision 0 0 0 0
Amortization of prior service cost (credit) (133) (133) (399) (399)
Recognized actuarial (gain) loss (386) (1,057) (1,160) (3,170)
Total net periodic benefit cost (credit) $ 333 $ (398) $ 997 $ (1,193)