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Post Retirement Benefits (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Pension, health and life insurance expense: |  |  |  |
Multi-employer plan | $ 179 | $ 157 | $ 600 | $ 549
Defined contribution plan | 263 | 258 | 881 | 766
Total pension expense | 442 | 415 | 1,481 | 1,315
Interest cost | 41 | 58 | 122 | 177
Amortization of prior service credits | (124) | (124) | (372) | (372)
Amortization of net loss | 43 | 46 | 130 | 135
Net periodic benefit credit | (40) | (20) | (120) | (60)
Total post-retirement benefits expense | 402 | $ 395 | 1,361 | $ 1,255
Pension Plan |  |  |  |
Pension, health and life insurance expense: |  |  |  |
Payments made to pension plans |  |  | 1,602 |
Pension plan payments expected to be made in fiscal year | 300 |  | 300 |
Pension plan payments accrued | 136 |  | 136 |
Other Postretirement Benefits Plan |  |  |  |
Pension, health and life insurance expense: |  |  |  |
Payments for post retirement healthcare and life insurance |  |  | 198 |
Pension plan payments expected to be made in fiscal year | 1,088 |  | 1,088 |
Pension plan payments accrued | $ 1,088 |  | $ 1,088 |

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