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Post Retirement Benefits (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Pension, health and life insurance expense:    
Multi-employer plan contributions $ 105,000 $ 112,000
Defined contribution plan contributions 169,000 174,000
Total pension expense 274,000 286,000
Interest cost 83,000 91,000
Amortization of prior service costs (124,000) (124,000)
Amortization of net loss 50,000 40,000
Net periodic benefit cost 9,000 7,000
Total post retirement benefits expense 283,000 293,000
Payments to pension plans 167,000  
Payments for post retirement healthcare and life insurance 130,000  
Expected payments to pension plans 873,000  
Amount of Expected Payments to Pension Plans Accrued 396,000  
Expected future payments for other post retirement benefits $ 922,000