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Employee Postretirement Benefits (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2024 and 2023:
Three Months Ended June 30,
Pension Benefits (Pension Plan)Pension Benefits (ESSRP)Postretirement Benefits
(in thousands)202420232024202320242023
Service Cost$971 $924 $— $18 $122 $153 
Interest Cost4,297 4,109 474 473 400 669 
Expected Return on Assets(6,379)(6,478)— — — — 
Amortization of Prior Service Cost— — — — (1,575)(1,434)
Amortization of Net Actuarial Loss39 — — — — — 
Net Periodic Benefit Cost (Income)$(1,072)$(1,445)$474 $491 $(1,053)$(612)
Six Months Ended June 30,
Pension Benefits (Pension Plan)Pension Benefits (ESSRP)Postretirement Benefits
(in thousands)202420232024202320242023
Service Cost$1,943 $1,849 $— $36 $245 $306 
Interest Cost8,594 8,218 948 945 800 1,338 
Expected Return on Assets(12,759)(12,957)— — — — 
Amortization of Prior Service Cost— — — — (3,151)(2,867)
Amortization of Net Actuarial Loss79 — — — — — 
Net Periodic Benefit Cost (Income)$(2,143)$(2,890)$948 $981 $(2,106)$(1,223)
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, 2024 and 2023:
Three Months Ended June 30,Six Months Ended June 30,
(in thousands)2024202320242023
Net Periodic Benefit Cost (Income)$(1,651)$(1,566)$(3,301)$(3,132)
Net Amount Amortized Due to the Effect of Regulation356 240 659 490 
Net Periodic Benefit Cost (Income) Recognized$(1,295)$(1,326)$(2,642)$(2,642)