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Employee Benefit Plans | 6 Months Ended
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Jun. 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 June 30, |  | Six Months Ended June 30,
(in thousands) |  | 2022 |  | 2021 |  | 2022 |  | 2021
Interest cost |  | $ | 4,333 |  |  | $ | 4,103 |  |  | $ | 8,666 |  |  | $ | 8,206 |
Expected return on plan assets, net of expenses |  | (6,224) |  |  | (5,820) |  |  | (12,448) |  |  | (11,640) |
Amortization of actuarial loss and prior service cost |  | 1,015 |  |  | 1,486 |  |  | 2,029 |  |  | 2,973 |
Total for defined benefit pension plan |  | (876) |  |  | (231) |  |  | (1,753) |  |  | (461) |
SERPs |  | 214 |  |  | 224 |  |  | 428 |  |  | 447 |
Defined contribution plan |  | 3,871 |  |  | 3,702 |  |  | 8,324 |  |  | 7,680 |
Net periodic benefit cost |  | $ | 3,209 |  |  | $ | 3,695 |  |  | $ | 6,999 |  |  | $ | 7,666 |
We contributed $0.5 million to fund current benefit payments for our SERPs during the six months ended June 30, 2022. During the remainder of 2022, we anticipate contributing an additional $1.3 million to fund the SERPs' benefit payments. We have met our 2022 funding requirements under the provisions of the Pension Funding Equity Act of 2004 and the Pension Protection Act of 2006.

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