XML 26 R15.htm IDEA: XBRL DOCUMENT v3.21.2
Pension Plan and Other Postretirement Benefits
 9 Months Ended
Sep. 30, 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 and nine months ended September 30, 2021 and 2020 are as follows:
Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)2021202020212020
Service Cost–Benefit Earned During the Period$1,866 $1,655 $5,597 $4,966 
Interest Cost on Projected Benefit Obligation2,915 3,264 8,745 9,790 
Expected Return on Assets(5,590)(5,506)(16,769)(16,516)
Amortization of Net Actuarial Loss:
From Regulatory Asset2,660 2,231 7,981 6,693 
From Other Comprehensive Income68 55 204 165 
Net Periodic Pension Cost$1,919 $1,699 $5,758 $5,098 
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 and nine months ended September 30, 2021 and 2020 are as follows:
Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)2021202020212020
Service Cost–Benefit Earned During the Period$47 $45 $140 $134 
Interest Cost on Projected Benefit Obligation307 362 921 1,086 
Amortization of Net Actuarial Loss:
From Regulatory Asset30 24 92 71 
From Other Comprehensive Income124 85 373 256 
Net Periodic Pension Cost$508 $516 $1,526 $1,547 
Other Postretirement Benefits
Components of net periodic postretirement benefit cost for the three and nine months ended September 30, 2021 and 2020 are as follows: 
Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)2021202020212020
Service Cost–Benefit Earned During the Period$430 $461 $1,291 $1,385 
Interest Cost on Projected Benefit Obligation472 598 1,418 1,795 
Amortization of Prior Service Cost
From Regulatory Asset(1,397)(1,169)(4,192)(3,508)
From Other Comprehensive Income(35)(28)(107)(86)
Amortization of Net Actuarial Loss
From Regulatory Asset919 1,051 2,759 3,154 
From Other Comprehensive Income24 26 71 78 
Net Periodic Postretirement Benefit Cost$413 $939 $1,240 $2,818