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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