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Employee Benefit Plans | 6 Months Ended
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Jun. 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 June 30, |  | Six Months Ended June 30,
(in thousands) |  | 2024 |  | 2023 |  | 2024 |  | 2023
Interest cost |  | $ | 5,603 |  |  | $ | 5,935 |  |  | $ | 11,205 |  |  | $ | 11,870 |
Expected return on plan assets, net of expenses |  | (6,018) |  |  | (6,307) |  |  | (12,036) |  |  | (12,613) |
Amortization of actuarial loss and prior service cost |  | 4 |  |  | 4 |  |  | 9 |  |  | 9 |
Total for defined benefit pension plan |  | (411) |  |  | (368) |  |  | (822) |  |  | (734) |
SERPs |  | 234 |  |  | 234 |  |  | 468 |  |  | 466 |
Defined contribution plan |  | 3,438 |  |  | 4,166 |  |  | 8,941 |  |  | 8,595 |
Net periodic benefit cost |  | $ | 3,261 |  |  | $ | 4,032 |  |  | $ | 8,587 |  |  | $ | 8,327 |
We contributed $0.6 million to fund current benefit payments for our SERPs during the six months ended June 30, 2024. During the remainder of 2024, we anticipate contributing an additional $0.8 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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