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Employee Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2025
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 six months ended June 30, 2025 and 2024:
Three Months Ended June 30,
Pension Benefits (Pension Plan)Pension Benefits (ESSRP)Postretirement Benefits
(in thousands)202520242025202420252024
Service Cost$875 $971 $— $— $122 $122 
Interest Cost4,326 4,297 473 474 402 400 
Expected Return on Assets(6,191)(6,379)— — — — 
Amortization of Prior Service Cost— — — — (949)(1,575)
Amortization of Net Actuarial Loss336 39 — — — — 
Net Periodic Benefit Cost (Income)$(654)$(1,072)$473 $474 $(425)$(1,053)
Six Months Ended June 30,
Pension Benefits (Pension Plan)Pension Benefits (ESSRP)Postretirement Benefits
(in thousands)202520242025202420252024
Service Cost$1,751 $1,943 $— $— $245 $245 
Interest Cost8,652 8,594 947 948 805 800 
Expected Return on Assets(12,382)(12,759)— — — — 
Amortization of Prior Service Cost— — — — (1,898)(3,151)
Amortization of Net Actuarial Loss671 79 — — — — 
Net Periodic Benefit Cost (Income)$(1,308)$(2,143)$947 $948 $(848)$(2,106)
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 six months ended June 30, 2025 and 2024:
Three Months Ended June 30,Six Months Ended June 30,
(in thousands)2025202420252024
Net Periodic Benefit Cost (Income)$(606)$(1,651)$(1,209)$(3,301)
Net Amount Amortized Due to the Effect of Regulation749 356 1,069 659 
Net Periodic Benefit Cost (Income) Recognized$143 $(1,295)$(140)$(2,642)