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Employee Benefit Plans | 3 Months Ended
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Mar. 31, 2020
Retirement Benefits [Abstract] |
Employee Benefit Plans | Employee Benefit Plans The components of net periodic benefit costs for Registrant’s pension plan, postretirement medical benefit plan and SERP for the three months ended March 31, 2020 and 2019 were as follows:
|  | For The Three Months Ended March 31,
|  | Pension Benefits |  | Other Postretirement Benefits |  | SERP
(dollars in thousands) |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019
Components of Net Periodic Benefits Cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 1,408 |  |  | $ | 1,234 |  |  | $ | 47 |  |  | $ | 53 |  |  | $ | 244 |  |  | $ | 298 |
Interest cost |  | 1,954 |  |  | 2,131 |  |  | 56 |  |  | 80 |  |  | 247 |  |  | 267 |
Expected return on plan assets |  | (2,950 | ) |  | (2,593 | ) |  | (127 | ) |  | (112 | ) |  | — |  |  | — |
Amortization of prior service cost |  | 109 |  |  | 109 |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of actuarial (gain) loss |  | 442 |  |  | 359 |  |  | (199 | ) |  | (150 | ) |  | 211 |  |  | 118 |
Net periodic benefits costs under accounting standards |  | 963 |  |  | 1,240 |  |  | (223 | ) |  | (129 | ) |  | 702 |  |  | 683 |
Regulatory adjustment - deferred |  | (93 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total expense (benefit) recognized, before surcharges and allocation to overhead pool |  | $ | 870 |  |  | $ | 1,240 |  |  | $ | (223 | ) |  | $ | (129 | ) |  | $ | 702 |  |  | $ | 683 |
In 2020, Registrant expects to contribute approximately $3.7 million to its pension plan. As authorized by the CPUC in the water and electric general rate case decisions, GSWC utilizes two-way balancing accounts for its water and electric regions and the general office to track differences between the forecasted annual pension expenses in rates, or expected to be in rates, and the actual annual expense recorded by GSWC in accordance with the accounting guidance for pension costs. During the three months ended March 31, 2020, GSWC's actual pension expense was higher than the amounts included in water customer rates by $93,000. During the three months ended March 31, 2019, GSWC did not have any deferral of pension costs as billed water revenues were based on 2018 rates. As of March 31, 2020, GSWC had a $2.7 million net over-collection in the two-way pension balancing accounts included as part of the pension regulatory asset (Note 3).

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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