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Employee Postretirement Benefits (Tables)
6 Months Ended
Jun. 30, 2023
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost (Income)
The following table includes 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, 2023 and 2022:
Three Months Ended June 30,
Pension Benefits (Pension Plan)Pension Benefits (ESSRP)Postretirement Benefits
(in thousands)202320222023202220232022
Service Cost$924 $1,644 $18 $49 $153 $334 
Interest Cost4,109 3,086 473 336 669 511 
Expected Return on Assets(6,478)(5,921) —  — 
Amortization of Prior Service Cost —  — (1,434)(1,434)
Amortization of Net Actuarial Loss 1,967  142  766 
Net Periodic Benefit Cost (Income)$(1,445)$776 $491 $527 $(612)$177 
Six Months Ended June 30,
Pension Benefits (Pension Plan)Pension Benefits (ESSRP)Postretirement Benefits
(in thousands)202320222023202220232022
Service Cost$1,849 $3,288 $36 $98 $306 $669 
Interest Cost8,218 6,172 945 671 1,338 1,021 
Expected Return on Assets(12,957)(11,842) —  — 
Amortization of Prior Service Cost —  — (2,867)(2,867)
Amortization of Net Actuarial Loss 3,933  284  1,532 
Net Periodic Benefit Cost (Income)$(2,890)$1,551 $981 $1,053 $(1,223)$355 
The following table includes the impact of regulation on the recognition of periodic benefit cost (income) arising from pension and other postretirement benefits for the three and six months ended June 30, 2023 and 2022:
Three Months Ended June 30,Six Months Ended June 30,
(in thousands)2023202220232022
Net Periodic Benefit Cost (Income)$(1,566)$1,480 $(3,132)$2,959 
Net Amount Amortized (Deferred) Due to the Effect of Regulation240 (204)490 324 
Net Periodic Benefit Cost (Income) Recognized$(1,326)$1,276 $(2,642)$3,283