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Pension Plan and Other Postretirement Benefits | 3 Months Ended
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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) | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Service Cost | $ | 1,644 |  |  | $ | 1,866 |  |  | $ | 49 |  |  | $ | 47 |  |  | $ | 335 |  |  | $ | 430 |
Interest Cost | 3,086 |  |  | 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 Loss | 1,966 |  |  | 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) | 2022 |  | 2021
Net Periodic Benefit Cost | $ | 1,479 |  |  | $ | 2,841 |
Net Amount Amortized (Deferred) Due to the Effect of Regulation | 527 |  |  | (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.

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