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Pension Plan and Other Postretirement Benefits
 3 Months Ended
Mar. 31, 2022
Retirement Benefits [Abstract]  
Pension Plan and Other 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, 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 of our defined benefit pension plans and other postretirement benefits for the three months ended March 31, 2022 and 2021:
Pension Benefits (Pension Plan)Pension Benefits (ESSRP)Postretirement Benefits
(in thousands)202220212022202120222021
Service Cost$1,644 $1,866 $49 $47 $335 $430 
Interest Cost3,086 2,915 335 307 510 473 
Expected Return on Assets(5,921)(5,590)— — — — 
Amortization of Prior Service Cost— — — — (1,433)(1,433)
Amortization of Net Actuarial Loss1,966 2,728 142 155 766 943 
Net Periodic Benefit Cost$775 $1,919 $526 $509 $178 $413 
The following table includes the impact of regulation on the recognition of periodic benefit cost arising from pension and other postretirement benefits for the three months ended March 31, 2022 and 2021:
(in thousands)20222021
Net Periodic Benefit Cost$1,479 $2,841 
Net Amount Amortized (Deferred) Due to the Effect of Regulation527 (115)
Net Periodic Benefit Cost Recognized$2,006 $2,726 
We had no minimum funding requirements for our pension plan or any other postretirement benefit plans as of December 31, 2021, but made a discretionary contribution of $20.0 million to our pension plan in February 2022.