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Post Retirement Benefits (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2016
Sep. 30, 2016
Sep. 30, 2015
Pension, health and life insurance expense:          
Multi-employer plan contributions $ 168,000 $ 218,000   $ 538,000 $ 646,000
Defined contribution plan contributions 165,000 222,000   578,000 629,000
Total pension expense 333,000 440,000   1,116,000 1,275,000
Interest cost 81,000 79,000   243,000 237,000
Amortization of prior service costs (124,000) (124,000)   (372,000) (372,000)
Amortization of net loss 38,000 42,000   116,000 126,000
Net periodic benefit cost (5,000) (3,000)   (13,000) (9,000)
Total post retirement benefits expense 328,000 $ 437,000   1,103,000 $ 1,266,000
Payments to pension plans       1,273,000  
Payments for post retirement healthcare and life insurance       271,000  
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     $ 218,000    
Expected future payments for other post retirement benefits     $ 136,000