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Retirement Plans and Other Post-Retirement Benefits (Tables)
3 Months Ended
Mar. 31, 2013
Retirement Plans and Other Post-Retirement Benefits [Abstract]  
Schedule of pension and post retirement medical benefit plans
                 
    Three months ended
March 31
 

In thousands

  2013     2012  

Pension Benefits

               

Service cost

  $ 3,211     $ 2,931  

Interest cost

    5,520       5,772  

Expected return on plan assets

    (10,903     (10,563

Amortization of prior service cost

    774       613  

Amortization of unrecognized loss

    5,289       4,323  
   

 

 

   

 

 

 

Subtotal

  $ 3,891     $ 3,076  
   

 

 

   

 

 

 
     

Other Benefits

               

Service cost

  $ 789     $ 710  

Interest cost

    545       609  

Expected return on plan assets

    —         (113

Amortization of prior service cost

    (125     (234

Amortization of unrecognized loss

    202       179  
   

 

 

   

 

 

 

Net periodic benefit cost

  $ 1,411     $ 1,151