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Employee Benefit Plans | 9 Months Ended
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Sep. 30, 2024
Retirement Benefits [Abstract] |
Employee Benefit Plans | Employee Benefit Plans We sponsor a noncontributory defined benefit pension plan and non-qualified Supplemental Executive Retirement Plans ("SERPs"). The accrual for future benefits has been frozen in our defined benefit pension plan and SERPs. We sponsor a defined contribution plan covering substantially all non-union and certain union employees. We match a portion of employees' voluntary contributions to this plan. Other union-represented employees are covered by defined benefit pension plans jointly sponsored by us and the union, or by union-sponsored multi-employer plans. The components of the employee benefit plan expense consisted of the following:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) |  | 2024 |  | 2023 |  | 2024 |  | 2023
Interest cost |  | $ | 5,628 |  |  | $ | 5,814 |  |  | $ | 16,833 |  |  | $ | 17,684 |
Expected return on plan assets, net of expenses |  | (6,018) |  |  | (6,302) |  |  | (18,054) |  |  | (18,915) |
Amortization of actuarial loss and prior service cost |  | 5 |  |  | 5 |  |  | 14 |  |  | 14 |
Total for defined benefit pension plan |  | (385) |  |  | (483) |  |  | (1,207) |  |  | (1,217) |
SERPs |  | 233 |  |  | 232 |  |  | 701 |  |  | 698 |
Defined contribution plan |  | 3,845 |  |  | 3,530 |  |  | 12,786 |  |  | 12,125 |
Net periodic benefit cost |  | $ | 3,693 |  |  | $ | 3,279 |  |  | $ | 12,280 |  |  | $ | 11,606 |
We contributed $0.9 million to fund current benefit payments for our SERPs during the nine months ended September 30, 2024. During the remainder of 2024, we anticipate contributing an additional $0.5 million to fund the SERPs' benefit payments. We have met regulatory funding requirements for our qualified benefit pension plan and do not have a mandatory contribution in 2024.

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