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Pensions | 6 Months Ended
--- | ---
Jun. 30, 2021
Pensions [Abstract] |
Pensions | 10. Pensions Components of Net Periodic Pension Cost
|  | Three Months Ended June 30 |  |  | Six Months Ended June 30 |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Service cost |  | $ | 272 |  |  | $ | 235 |  |  | $ | 543 |  |  | $ | 469 |
Interest cost |  |  | 302 |  |  |  | 364 |  |  |  | 604 |  |  |  | 728 |
Expected return on plan assets |  |  | (913 | ) |  |  | (800 | ) |  |  | (1,826 | ) |  |  | (1,599 | )
Amortization of actuarial loss |  |  | 121 |  |  |  | 93 |  |  |  | 242 |  |  |  | 185 |
Amortization of prior service cost |  |  | (3 | ) |  |  | (3 | ) |  |  | (6 | ) |  |  | (6 | )
Rate-regulated adjustment |  |  | 796 |  |  |  | 686 |  |  |  | 1,593 |  |  |  | 1,373 |
Net periodic pension expense |  | $ | 575 |  |  | $ | 575 |  |  | $ | 1,150 |  |  | $ | 1,150 |
Pension service cost is recorded in operating expenses. All other components of net periodic pension cost are recorded as other pension costs in other income (expenses). Employer Contributions The Company previously disclosed in its financial statements for the year ended December 31, 2020 that it expected to contribute $2,300 to its pension plans in 2021. For the six months ended June 30, 2021, contributions of $1,150 have been made. The Company expects to contribute the remaining $1,150 during the final two quarters of 2021.

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