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Post Retirement Benefits - Post Retirement Benefits Expense (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension, health and life insurance expense: |  |  |
Multi-employer plan | $ 676,000 | $ 971,000 | $ 760,000
Defined contribution plans | 1,173,000 | 1,258,000 | 1,059,000
Total pension expense | 1,849,000 | 2,229,000 | 1,819,000
Interest cost | 235,000 | 285,000 | 277,000
Amortization of prior service costs | (496,000) | (496,000) | (496,000)
Amortization of net loss | 181,000 | 117,000 | 171,000
Net periodic benefit cost | (80,000) | (94,000) | (48,000)
Total post retirement benefits expense | $ 1,769,000 | $ 2,135,000 | $ 1,771,000

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