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Pension Plan and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
Schedule of components of net periodic benefit costs for the pension plans and other postretirement benefits
The following table lists 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 benefits.
Pension PlanOther Benefits
 Three Months Ended June 30,
 2024202320242023
Service cost$5,648 $6,046 $1,520 $1,126 
Interest cost8,881 8,746 1,684 1,297 
Expected return on plan assets(13,236)(13,421)(2,987)(2,636)
Amortization of prior service cost131 131 39 39 
Recognized net actuarial (gain) loss189 (637)(198)(581)
Net periodic benefit cost (credit)$1,613 $865 $58 $(755)
Pension PlanOther Benefits
 Six Months Ended June 30,
 2024202320242023
Service cost$11,296 $12,092 $3,040 $2,252 
Interest cost17,762 17,492 3,368 2,595 
Expected return on plan assets(26,472)(26,842)(5,974)(5,271)
Amortization of prior service cost262 262 78 77 
Recognized net actuarial (gain) loss378 (1,274)(396)(1,163)
Net periodic benefit cost (credit)$3,226 $1,730 $116 $(1,510)