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Post Retirement Benefits (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Pension, health and life insurance expense:        
Multi-employer plan contributions $ 112,000 $ 125,000 $ 327,000 $ 344,000
Defined contribution plan contributions 147,000 115,000 432,000 426,000
Total pension expense 259,000 240,000 759,000 770,000
Interest cost 83,000 91,000 249,000 273,000
Amortization of prior service costs (124,000) (124,000) (372,000) (372,000)
Amortization of net loss 51,000 40,000 151,000 119,000
Net periodic benefit cost 10,000 7,000 28,000 20,000
Total post retirement benefits expense 269,000 247,000 787,000 790,000
Payments to pension plans     858,000  
Payments for post retirement healthcare and life insurance     436,000  
Expected payments to pension plans     149,000  
Expected future payments for other post retirement benefits     $ 145,000