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Post Retirement Benefits (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2017
Jun. 30, 2017
Jun. 30, 2016
Pension, health and life insurance expense:          
Multi-employer plan contributions $ 169,000 $ 183,000   $ 326,000 $ 370,000
Defined contribution plan contributions 188,000 195,000   395,000 413,000
Total pension expense 357,000 378,000   721,000 783,000
Interest cost 74,000 81,000   149,000 162,000
Amortization of prior service costs (124,000) (124,000)   (248,000) (248,000)
Amortization of net loss 38,000 39,000   75,000 78,000
Net periodic benefit cost (12,000) (4,000)   (24,000) (8,000)
Total post retirement benefits expense 345,000 $ 374,000   697,000 $ 775,000
Payments to pension plans       999,000  
Payments for post retirement healthcare and life insurance       208,000  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Accrued Expected Pension Plan Payments $ 65,000     $ 65,000  
Scenario, Forecast [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Expected payments to pension plans     $ 439,000    
Expected future payments for other post retirement benefits     $ 176,000