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RETIREMENT BENEFIT PLANS | 3 Months Ended
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Mar. 31, 2024
Retirement Benefits [Abstract] |
RETIREMENT BENEFIT PLANS | 11. RETIREMENT BENEFIT PLANS We established a defined benefit pension plan as well as a postretirement benefit plan to assume certain retirement benefit obligations related to eligible Transtar employees. Defined Benefit Pensions Our underfunded pension plan is a tax qualified plan, and we will make contributions accordingly. Our pension plan covers certain eligible Transtar employees and is noncontributory. Pension benefits earned are generally based on years of service and compensation during active employment. Postretirement Benefits Our unfunded postretirement plan provides healthcare and life insurance benefits for eligible retirees and dependents of Transtar. Depending on retirement date and employee classification, certain healthcare plans contain contribution and cost-sharing features such as deductibles and co-insurance. The remaining healthcare and life insurance plans are non-contributory. The following table summarizes our retirement benefit plan costs. Service costs are recorded in Operating expenses, while other net costs are recorded in Other income within the Consolidated Statements of Operations.
| Three Months Ended March 31,
| 2024 |  | 2023
| Pension Benefits |  | Postretirement Benefits |  | Pension Benefits |  | Postretirement Benefits
Service costs | $ | 374 |  |  | $ | 484 |  |  | $ | 348 |  |  | $ | 446 |
Interest costs | 154 |  |  | 409 |  |  | 117 |  |  | 374 |
Expected return on plan assets | (51) |  |  | — |  |  | — |  |  | — |
Amortization of prior service costs | — |  |  | 40 |  |  | — |  |  | 34 |
Amortization of actuarial gains | (3) |  |  | — |  |  | (46) |  |  | — |
Total | $ | 474 |  |  | $ | 933 |  |  | $ | 419 |  |  | $ | 854 |
The total employer contributions for the three months ended March 31, 2024 and 2023 was $0.7 million and $0.3 million, respectively, and the expected remaining scheduled employer contributions for the year ending December 31, 2024 is $1.2 million.

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