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Pensions | 9 Months Ended
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Sep. 30, 2023
Pensions [Abstract] |
Pensions | 11. Pensions Components of Net Periodic Pension Cost
|  | Three Months Ended September 30 |  |  | Nine Months Ended September 30 |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Service cost |  | $ | 150 |  |  | $ | 257 |  |  | $ | 449 |  |  | $ | 769 |
Interest cost |  |  | 469 |  |  |  | 334 |  |  |  | 1,407 |  |  |  | 1,002 |
Expected return on plan assets |  |  | (903 | ) |  |  | (1,054 | ) |  |  | (2,709 | ) |  |  | (3,163 | )
Amortization of prior service cost |  |  | (4 | ) |  |  | (4 | ) |  |  | (10 | ) |  |  | (10 | )
Rate-regulated adjustment |  |  | 677 |  |  |  | 1,042 |  |  |  | 2,154 |  |  |  | 3,127 |
Net periodic pension expense |  | $ | 389 |  |  | $ | 575 |  |  | $ | 1,291 |  |  | $ | 1,725 |
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, 2022 that it expected to contribute $1,680 to its pension plans in 2023. For the nine months ended September 30, 2023, contributions of $1,291 have been made. The Company expects to contribute the remaining $389 during the final quarter of 2023.

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