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Post Retirement Benefits (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Pension, health and life insurance expense:        
Multi-employer plan contributions $ 125,000 $ 103,000 $ 344,000 $ 307,000
Defined contribution plan contributions 115,000 121,000 426,000 412,000
Total pension expense 240,000 224,000 770,000 719,000
Interest cost 91,000 133,000 273,000 398,000
Amortization of prior service costs (124,000) (124,000) (372,000) (372,000)
Amortization of net loss 40,000 55,000 119,000 164,000
Net periodic benefit cost 7,000 64,000 20,000 190,000
Total post retirement benefits expense 247,000 288,000 790,000 909,000
Payments to pension plans     834,000  
Payments for post retirement healthcare and life insurance     632,000  
Expected payments to pension plans     187,000  
Expected payments for post retirement healthcare and life insurance     369,000  
Expected payments for post retirement healthcare and life insurance accrued $ 369,000   $ 369,000