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Post Retirement Benefits (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Pension, health and life insurance expense:        
Multi-employer plan contributions $ 110,000 $ 117,000 $ 215,000 $ 229,000
Defined contribution plan contributions 116,000 127,000 285,000 301,000
Total pension expense 226,000 244,000 500,000 530,000
Interest cost 83,000 91,000 166,000 182,000
Amortization of prior service costs (124,000) (124,000) (248,000) (248,000)
Amortization of net loss 51,000 40,000 101,000 79,000
Net periodic benefit cost 10,000 7,000 19,000 13,000
Total post retirement benefits expense 236,000 251,000 519,000 543,000
Payments to pension plans     709,000  
Payments for post retirement healthcare and life insurance     277,000  
Expected payments to pension plans     270,000  
Expected future payments for other post retirement benefits     $ 304,000