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Post Retirement Benefits (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Pension, health and life insurance expense:        
Multi-employer plan contributions $ 117,000 $ 110,000 $ 229,000 $ 204,000
Defined contribution plan contributions 127,000 125,000 301,000 290,000
Total pension expense 244,000 235,000 530,000 494,000
Interest cost 91,000 132,000 182,000 265,000
Amortization of prior service costs (124,000) (124,000) (248,000) (248,000)
Amortization of net loss 40,000 55,000 79,000 110,000
Net periodic benefit cost 7,000 63,000 13,000 127,000
Total post retirement benefits expense 251,000 298,000 543,000 621,000
Payments to pension plans     722,000  
Payments for post retirement healthcare and life insurance     505,000  
Expected payments to pension plans     295,000  
Expected payments for post retirement healthcare and life insurance     497,000  
Expected payments for post retirement healthcare and life insurance accrued $ 497,000   $ 497,000