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Retirement Plans and Other Post-Retirement Benefits (Details 3)
Dec. 31, 2012
Dec. 31, 2011
Pension Benefits [Member]
   
Weighted-average assumptions used in computing the benefit obligations    
Discount rate-benefit obligation 4.28% 5.09%
Future compensation growth rate 4.00% 4.00%
Other Benefits [Member]
   
Weighted-average assumptions used in computing the benefit obligations    
Discount rate-benefit obligation 3.58% 4.45%