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Pension Plan and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 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 June 30,
 2025202420252024
Service cost$5,207 $5,648 $1,408 $1,520 
Interest cost9,553 8,881 1,773 1,684 
Expected return on plan assets(12,793)(13,236)(3,197)(2,987)
Amortization of prior service cost131 131 39 39 
Recognized net actuarial loss (gain)
194 189 (522)(198)
Net periodic benefit cost (credit)$2,292 $1,613 $(499)$58 
Pension PlanOther Benefits
 Six Months Ended June 30,
 2025202420252024
Service cost$10,414 $11,296 $2,816 $3,040 
Interest cost19,106 17,762 3,546 3,368 
Expected return on plan assets(25,586)(26,472)(6,394)(5,974)
Amortization of prior service cost262 262 78 78 
Recognized net actuarial loss (gain)
388 378 (1,044)(396)
Net periodic benefit cost (credit)$4,584 $3,226 $(998)$116