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Pension Plan and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2026
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 PlanOther Benefits
 Three Months Ended March 31,
 2026202520262025
Service cost$5,782 $5,207 $1,330 $1,408 
Interest cost10,232 9,553 1,642 1,773 
Expected return on plan assets(14,276)(12,793)(3,679)(3,197)
Amortization of prior service cost131 131 39 39 
Recognized net actuarial loss (gain)
606 194 (963)(522)
Net periodic benefit cost (credit)$2,475 $2,292 $(1,631)$(499)