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Post Retirement Benefits (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Pension, health and life insurance expense:          
Multi-employer plan contributions $ 231,000 $ 185,000   $ 462,000 $ 363,000
Defined contribution plan contributions 324,000 286,000   586,000 545,000
Total pension expense 555,000 471,000   1,048,000 908,000
Interest cost 72,000 69,000   144,000 138,000
Amortization of prior service costs (125,000) (124,000)   (250,000) (248,000)
Amortization of net loss 29,000 43,000   58,000 86,000
Net periodic benefit cost (24,000) (12,000)   (48,000) (24,000)
Total post retirement benefits expense 531,000 $ 459,000   1,000,000 $ 884,000
Payments to pension plans       699,000  
Payments for post retirement healthcare and life insurance       152,000  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Accrued Expected Pension Plan Payments $ 758,000     $ 758,000  
Scenario, Forecast [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Expected payments to pension plans     $ 1,286,000    
Expected future payments for other post retirement benefits     $ 1,005,000