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Post Retirement Benefits - Post Retirement Benefits Expense (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Pension, health and life insurance expense:      
Pension Cost (Reversal of Cost) [1] $ 971,000 $ 760,000 $ 647,000
Other Postretirement Benefits Cost (Reversal of Cost) 1,258,000 1,059,000 752,000
Pension and Other Postretirement Benefits Cost (Reversal of Cost) 2,229,000 1,819,000 1,399,000
Interest cost 285,000 277,000 298,000
Amortization of prior service costs (496,000) (496,000) (496,000)
Amortization of net loss 117,000 171,000 149,000
Net periodic benefit cost (94,000) (48,000) (49,000)
Total post retirement benefits expense 2,135,000 1,771,000 $ 1,350,000
Postretirement benefits      
Postretirement benefits:      
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 1,099,000 910,000  
Pension, health and life insurance expense:      
Interest cost $ 285,000 $ 277,000  
[1] The plan re-certified its zone status after using the amortization provisions of the Code. The Company's contributions to the plan did not represent more than 5% of total contributions to the plan as indicated in the plan's most recently available annual report for the plan year ended December 31, 2018. Under the terms of the collective-bargaining agreement, the Company is required to make contributions to the plan for each hour worked up to a maximum of 40 hours per person, per week at $1.55 per hour from August 10, 2019 through August 6, 2022.