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Employee Postretirement Benefits
 3 Months Ended
Mar. 31, 2023
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 table includes the components of net periodic benefit cost (income) related to our defined benefit pension plans and other postretirement benefits for the three months ended March 31, 2023 and 2022:
Three Months Ended March 31,
Pension Benefits (Pension Plan)Pension Benefits (ESSRP)Postretirement Benefits
(in thousands)202320222023202220232022
Service Cost$925 $1,644 $18 $49 $153 $335 
Interest Cost4,109 3,086 314 335 669 510 
Expected Return on Assets(6,479)(5,921)— — — — 
Amortization of Prior Service Cost— — — — (1,433)(1,433)
Amortization of Net Actuarial Loss— 1,966 — 142 — 766 
Net Periodic Benefit Cost (Income)$(1,445)$775 $332 $526 $(611)$178 
The following table includes the impact of regulation on the recognition of periodic benefit cost (income) arising from pension and other postretirement benefits for the three months ended March 31, 2023 and 2022:
Three Months Ended March 31,
(in thousands)20232022
Net Periodic Benefit Cost (Income)$(1,724)$1,479 
Net Amount Amortized (Deferred) Due to the Effect of Regulation408 527 
Net Periodic Benefit Cost (Income) Recognized$(1,316)$2,006 
We had no minimum funding requirements for our Pension Plan or any other postretirement benefit plans as of December 31, 2022. We did not make any contributions to our Pension Plan during the three months ended March 31, 2023. We made discretionary contributions to our Pension Plan of $20.0 million during the three months ended March 31, 2022.