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Employee Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost (Income)
The following tables include the components of net periodic benefit cost (income) related to our defined benefit pension plans and other postretirement benefits for the three and nine months ended September 30, 2024 and 2023:
Three Months Ended September 30,
Pension Benefits (Pension Plan)Pension Benefits (ESSRP)Postretirement Benefits
(in thousands)202420232024202320242023
Service Cost$972 $925 $— $18 $123 $152 
Interest Cost4,297 4,109 474 472 399 668 
Expected Return on Assets(6,380)(6,479)— — — — 
Amortization of Prior Service Cost— — — — (1,576)(1,433)
Amortization of Net Actuarial Loss40 — — — — — 
Net Periodic Benefit Cost (Income)$(1,071)$(1,445)$474 $490 $(1,054)$(613)
Nine Months Ended September 30,
Pension Benefits (Pension Plan)Pension Benefits (ESSRP)Postretirement Benefits
(in thousands)202420232024202320242023
Service Cost$2,915 $2,774 $— $54 $368 $458 
Interest Cost12,891 12,327 1,422 1,417 1,199 2,006 
Expected Return on Assets(19,139)(19,436)— — — — 
Amortization of Prior Service Cost— — — — (4,727)(4,300)
Amortization of Net Actuarial Loss119 — — — — — 
Net Periodic Benefit Cost (Income)$(3,214)$(4,335)$1,422 $1,471 $(3,160)$(1,836)
The following table includes the impact of regulation on the recognition of periodic benefit cost (income) arising from pension and other postretirement benefits for the three and nine months ended September 30, 2024 and 2023:
Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)2024202320242023
Net Periodic Benefit Cost (Income)$(1,651)$(1,568)$(4,952)$(4,700)
Net Amount Amortized Due to the Effect of Regulation379 374 1,038 864 
Net Periodic Benefit Cost (Income) Recognized$(1,272)$(1,194)$(3,914)$(3,836)