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Pension Plan and Other Postretirement Benefits
 3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Pension Plan and Other Postretirement Benefits Pension Plan and Other Postretirement Benefits
Pension Plan
Components of net periodic pension benefit cost for the three months ended March 31, 2021 and 2020 are as follows:
(in thousands)20212020
Service Cost–Benefit Earned During the Period$1,866 $1,655 
Interest Cost on Projected Benefit Obligation2,915 3,263 
Expected Return on Assets(5,590)(5,505)
Amortization of Net Actuarial Loss:
From Regulatory Asset2,660 2,231 
From Other Comprehensive Income68 55 
Net Periodic Pension Cost$1,919 $1,699 
We had no minimum funding requirement as of December 31, 2020 but made a discretionary plan contribution of $10.0 million in January 2021.
Executive Survivor and Supplemental Retirement Plan (ESSRP)
Components of net periodic pension benefit cost for the three months ended March 31, 2021 and 2020 are as follows:
(in thousands)20212020
Service Cost–Benefit Earned During the Period$47 $45 
Interest Cost on Projected Benefit Obligation307 362 
Amortization of Net Actuarial Loss:
From Regulatory Asset31 23 
From Other Comprehensive Income124 86 
Net Periodic Pension Cost$509 $516 
Other Postretirement Benefits
Components of net periodic postretirement benefit cost for the three months ended March 31, 2021 and 2020 are as follows: 
(in thousands)20212020
Service Cost–Benefit Earned During the Period$430 $462 
Interest Cost on Projected Benefit Obligation473 598 
Amortization of Prior Service Cost
From Regulatory Asset(1,397)(1,169)
From Other Comprehensive Income(36)(29)
Amortization of Net Actuarial Loss
From Regulatory Asset920 1,051 
From Other Comprehensive Income23 26 
Net Periodic Postretirement Benefit Cost$413 $939