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Post Retirement Benefits (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Pension, health and life insurance expense: |  |  |  |
Multi-employer plan | $ 232 | $ 145 | $ 421 | $ 391
Defined contribution plan | 316 | 215 | 618 | 508
Total pension expense | 548 | 360 | 1,039 | 899
Interest cost | 40 | 59 | 81 | 118
Amortization of prior service credits | (124) | (124) | (248) | (248)
Amortization of net loss | 44 | 45 | 87 | 90
Net periodic benefit credit | (40) | (20) | (80) | (40)
Total post retirement benefits expense | 508 | $ 340 | 959 | $ 859
Pension Plan |  |  |  |
Pension, health and life insurance expense: |  |  |  |
Payments made to pension plans |  |  | 683 |
Pension plan payments expected to be made in fiscal year | 1,332 |  | 1,332 |
Pension plan payments accrued | 772 |  | 772 |
Other Postretirement Benefits Plan |  |  |  |
Pension, health and life insurance expense: |  |  |  |
Payments for post retirement healthcare and life insurance |  |  | 157 |
Pension plan payments expected to be made in fiscal year | 1,129 |  | 1,129 |
Pension plan payments accrued | $ 1,129 |  | $ 1,129 |

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