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Post Retirement Benefits - Post Retirement Benefits Expense (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Pension, health and life insurance expense:      
Multi-employer plan contributions [1] $ 647,000 $ 710,000 $ 863,000
Defined contribution plan contributions 752,000 766,000 836,000
Total pension expense 1,399,000 1,476,000 1,699,000
Interest cost 298,000 323,000 316,000
Amortization of prior service costs (496,000) (496,000) (496,000)
Amortization of net loss 149,000 155,000 169,000
Net periodic benefit cost (49,000) (18,000) (11,000)
Total post retirement benefits expense 1,350,000 1,458,000 $ 1,688,000
Postretirement benefits      
Postretirement benefits:      
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 417,000 320,000  
Pension, health and life insurance expense:      
Interest cost $ 298,000 $ 323,000  
[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, 2016. 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 the following rates: $1.45 per hour from August 8, 2016 through August 6, 2017; $1.50 per hour from August 7, 2017 through August 5, 2018; $1.55 per hour from August 6, 2018 through August 10, 2019.