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Post Retirement Benefits (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2016
Jun. 30, 2016
Jun. 30, 2015
Pension, health and life insurance expense:          
Multi-employer plan contributions $ 183,000 $ 217,000   $ 370,000 $ 428,000
Defined contribution plan contributions 195,000 173,000   413,000 407,000
Total pension expense 378,000 390,000   783,000 835,000
Interest cost 81,000 79,000   162,000 158,000
Amortization of prior service costs (124,000) (124,000)   (248,000) (248,000)
Amortization of net loss 39,000 42,000   78,000 84,000
Net periodic benefit cost (4,000) (3,000)   (8,000) (6,000)
Total post retirement benefits expense 374,000 $ 387,000   775,000 $ 829,000
Payments to pension plans       1,061,000  
Payments for post retirement healthcare and life insurance       138,000  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Accrued Expected Pension Plan Payments $ 66,000     $ 66,000  
Scenario, Forecast [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Expected payments to pension plans     $ 465,000    
Expected future payments for other post retirement benefits     $ 269,000