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Pension Plan and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2025
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 September 30,
 2025202420252024
Service cost$5,206 $5,648 $1,407 $1,521 
Interest cost9,552 8,880 1,774 1,684 
Expected return on plan assets(12,792)(13,234)(3,197)(2,988)
Amortization of prior service cost132 131 38 38 
Recognized net actuarial loss (gain)
195 189 (522)(196)
Net periodic benefit cost (credit)$2,293 $1,614 $(500)$59 
Pension PlanOther Benefits
 Nine Months Ended September 30,
 2025202420252024
Service cost$15,620 $16,944 $4,223 $4,561 
Interest cost28,658 26,642 5,320 5,052 
Expected return on plan assets(38,378)(39,706)(9,591)(8,962)
Amortization of prior service cost394 393 116 116 
Recognized net actuarial loss (gain)
583 567 (1,566)(592)
Net periodic benefit cost (credit)$6,877 $4,840 $(1,498)$175