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Post Retirement Benefits (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Pension, health and life insurance expense: |  |  |  |
Multi-employer plan | $ 157,000 | $ 270,000 | $ 549,000 | $ 732,000
Defined contribution plan | 258,000 | 364,000 | 766,000 | 950,000
Total pension expense | 415,000 | 634,000 | 1,315,000 | 1,682,000
Interest cost | 59,000 | 72,000 | 177,000 | 216,000
Amortization of prior service costs | (124,000) | (125,000) | (372,000) | (375,000)
Amortization of net loss | 45,000 | 30,000 | 135,000 | 88,000
Net periodic benefit cost | (20,000) | (23,000) | (60,000) | (71,000)
Total post retirement benefits expense | $ 395,000 | $ 611,000 | $ 1,255,000 | $ 1,611,000

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