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Employee Benefit Plans | 9 Months Ended
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Sep. 30, 2022
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) |  | 2022 |  | 2021 |  | 2022 |  | 2021
Interest cost |  | $ | 4,333 |  |  | $ | 4,143 |  |  | $ | 12,999 |  |  | $ | 12,349 |
Expected return on plan assets, net of expenses |  | (6,227) |  |  | (5,786) |  |  | (18,675) |  |  | (17,426) |
Amortization of actuarial loss and prior service cost |  | 997 |  |  | 1,684 |  |  | 3,026 |  |  | 4,657 |
Total for defined benefit pension plan |  | (897) |  |  | 41 |  |  | (2,650) |  |  | (420) |
SERPs |  | 214 |  |  | 223 |  |  | 642 |  |  | 670 |
Defined contribution plan |  | 3,258 |  |  | 3,197 |  |  | 11,582 |  |  | 10,877 |
Net periodic benefit cost |  | $ | 2,575 |  |  | $ | 3,461 |  |  | $ | 9,574 |  |  | $ | 11,127 |
We contributed $0.8 million to fund current benefit payments for our SERPs and provided a $25 million discretionary contribution to our defined benefit pension plan during the nine months ended September 30, 2022. During the remainder of 2022, we anticipate contributing an additional $1.1 million to fund the SERPs' benefit payments and do not expect any additional contributions to our defined pension plan.

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