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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2021
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) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Interest cost |  | $ | 4,103 |  |  | $ | 4,918 |  |  | $ | 8,206 |  |  | $ | 9,835 |
Expected return on plan assets, net of expenses |  | (5,820) |  |  | (5,256) |  |  | (11,640) |  |  | (10,512) |
Amortization of actuarial loss and prior service cost |  | 1,486 |  |  | 1,124 |  |  | 2,973 |  |  | 2,249 |
Total for defined benefit pension plan |  | (231) |  |  | 786 |  |  | (461) |  |  | 1,572 |
Multi-employer plans |  | — |  |  | 52 |  |  | — |  |  | 61 |
SERPs |  | 224 |  |  | 240 |  |  | 447 |  |  | 480 |
Defined contribution plan |  | 3,702 |  |  | 3,702 |  |  | 7,680 |  |  | 7,481 |
Net periodic benefit cost |  | 3,695 |  |  | 4,780 |  |  | 7,666 |  |  | 9,594 |
Allocated to discontinued operations |  | — |  |  | (121) |  |  | — |  |  | (326) |
Net periodic benefit cost — continuing operations |  | $ | 3,695 |  |  | $ | 4,659 |  |  | $ | 7,666 |  |  | $ | 9,268 |
We contributed $0.5 million to fund current benefit payments for our SERPs and $12.0 million for our defined benefit pension plan during the six months ended June 30, 2021. During the remainder of 2021, we anticipate contributing an additional $0.9 million to fund the SERPs' benefit payments. We are required to contribute an additional $12.4 million to fund our qualified defined benefit pension plan in order to meet our 2021 funding requirements under the provisions of the Pension Funding Equity Act of 2004 and the Pension Protection Act of 2006.

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