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Employee Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2022
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
The following tables include the components of net periodic benefit cost of our defined benefit pension plans and other postretirement benefits for the three and six months ended June 30, 2022 and 2021:
Three Months Ended June 30,
Pension Benefits (Pension Plan)Pension Benefits (ESSRP)Postretirement Benefits
(in thousands)202220212022202120222021
Service Cost$1,644 $1,865 $49 $46 $334 $431 
Interest Cost3,086 2,915 336 307 511 473 
Expected Return on Assets(5,921)(5,589)— — — — 
Amortization of Prior Service Cost— — — — (1,434)(1,434)
Amortization of Net Actuarial Loss1,967 2,729 142 156 766 944 
Net Periodic Benefit Cost$776 $1,920 $527 $509 $177 $414 
Six Months Ended June 30,
Pension Benefits (Pension Plan)Pension Benefits (ESSRP)Postretirement Benefits
(in thousands)202220212022202120222021
Service Cost$3,288 $3,731 $98 $93 $669 $861 
Interest Cost6,172 5,830 671 614 1,021 946 
Expected Return on Assets(11,842)(11,179)— — — — 
Amortization of Prior Service Cost— — — — (2,867)(2,867)
Amortization of Net Actuarial Loss3,933 5,457 284 311 1,532 1,887 
Net Periodic Benefit Cost$1,551 $3,839 $1,053 $1,018 $355 $827 
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 and six months ended June 30, 2022 and 2021:
Three Months Ended June 30,Six Months Ended June 30,
(in thousands)2022202120222021
Net Periodic Benefit Cost$1,480 $2,843 $2,959 $5,684 
Net Amount Amortized (Deferred) Due to the Effect of Regulation(204)123 324 7 
Net Periodic Benefit Cost Recognized$1,276 $2,966 $3,283 $5,691