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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2026
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) |  | 2026 |  | 2025 |  | 2026 |  | 2025
Interest cost |  | $ | 5,345 |  |  | $ | 5,649 |  |  | $ | 10,689 |  |  | $ | 11,298 |
Expected return on plan assets, net of expenses |  | (5,078) |  |  | (5,559) |  |  | (10,157) |  |  | (11,117) |
Amortization of actuarial loss and prior service cost |  | 285 |  |  | 5 |  |  | 570 |  |  | 9 |
Total for defined benefit pension plan |  | 552 |  |  | 95 |  |  | 1,102 |  |  | 190 |
SERPs |  | 182 |  |  | 242 |  |  | 365 |  |  | 485 |
Defined contribution plan |  | 3,067 |  |  | 3,237 |  |  | 7,619 |  |  | 8,381 |
Net periodic benefit cost |  | $ | 3,801 |  |  | $ | 3,574 |  |  | $ | 9,086 |  |  | $ | 9,056 |
We contributed $0.6 million to fund current benefit payments for our SERPs during the six months ended June 30, 2026. During the remainder of 2026, we anticipate contributing an additional $0.7 million to fund the SERPs' benefit payments. Additionally, during the remainder of 2026, we have required pension plan contributions totaling $4.7 million.

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