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Post Retirement Benefits - Schedule of Post Retirement Benefits Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension expense: |  |  |
Multi-employer plan | $ 981 | $ 1,137 | $ 857
Defined contribution plans | 1,873 | 1,482 | 1,231
Total pension expense | 2,854 | 2,619 | 2,088
Health and life insurance: |  |  |
Interest cost | 254 | 198 | 161
Amortization of prior service credits | (496) | (496) | (496)
Amortization of net loss | 22 | 174 | 173
Net periodic benefit credit | (220) | (124) | (162)
Total post retirement benefits expense | $ 2,634 | $ 2,495 | $ 1,926

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