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Pension Plans and Other Postretirement Benefits (Details 1) (Other Postretirement Benefit Plans [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Other Postretirement Benefit Plans [Member]
       
Components of net periodic benefit:        
Service cost          
Interest cost 22 32 68 91
Amortization of prior service cost          
Actuarial loss (131) (101) (392) (376)
Net periodic pension (benefit) expense $ (109) $ (69) $ (324) $ (285)