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Employee Postretirement Benefits
 9 Months Ended
Sep. 30, 2025
Retirement Benefits [Abstract]  
Employee Postretirement Benefits Employee Postretirement Benefits
Pension Plan and Other Postretirement Benefits
The Company sponsors a noncontributory funded pension plan (the Pension Plan), an unfunded, nonqualified Executive Survivor and Supplemental Retirement Plan (the ESSRP), both accounted for as defined benefit pension plans, and a postretirement healthcare plan accounted for as an other postretirement benefit plan.
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, 2025 and 2024:
Three Months Ended September 30,
Pension Benefits (Pension Plan)Pension Benefits (ESSRP)Postretirement Benefits
(in thousands)202520242025202420252024
Service Cost$876 $972 $— $— $123 $123 
Interest Cost4,325 4,297 474 474 403 399 
Expected Return on Assets(6,191)(6,380)— — — — 
Amortization of Prior Service Cost— — — — (948)(1,576)
Amortization of Net Actuarial Loss335 40 — — — — 
Net Periodic Benefit Cost (Income)$(655)$(1,071)$474 $474 $(422)$(1,054)
Nine Months Ended September 30,
Pension Benefits (Pension Plan)Pension Benefits (ESSRP)Postretirement Benefits
(in thousands)202520242025202420252024
Service Cost$2,627 $2,915 $— $— $368 $368 
Interest Cost12,977 12,891 1,421 1,422 1,208 1,199 
Expected Return on Assets(18,573)(19,139)— — — — 
Amortization of Prior Service Cost— — — — (2,846)(4,727)
Amortization of Net Actuarial Loss1,006 119 — — — — 
Net Periodic Benefit Cost (Income)$(1,963)$(3,214)$1,421 $1,422 $(1,270)$(3,160)
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, 2025 and 2024:
Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)2025202420252024
Net Periodic Benefit Cost (Income)$(603)$(1,651)$(1,812)$(4,952)
Net Amount Amortized Due to the Effect of Regulation1,298 379 2,366 1,038 
Net Periodic Benefit Cost (Income) Recognized$695 $(1,272)$554 $(3,914)
We had no minimum funding requirements for our Pension Plan or any other postretirement benefit plans as of December 31, 2024. We did not make any contributions to our Pension Plan during the nine months ended September 30, 2025 and 2024.