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Retirement Plans and Other Post-Retirement Benefits
3 Months Ended
Mar. 31, 2014
Compensation And Retirement Disclosure [Abstract]  
Retirement Plans and Other Post-Retirement Benefits
9. RETIREMENT PLANS AND OTHER POST-RETIREMENT BENEFITS

The following tables provide information with respect to the net periodic costs of our pension and post retirement medical benefit plans.

 

     Three months ended  
   March 31  

In thousands

   2014     2013  

Pension Benefits

    

Service cost

   $ 2,703      $ 3,211   

Interest cost

     6,171        5,520   

Expected return on plan assets

     (11,007     (10,903

Amortization of prior service cost

     734        774   

Amortization of unrecognized loss

     2,940        5,289   
  

 

 

   

 

 

 

Net periodic benefit cost

   $ 1,541      $ 3,891   
  

 

 

   

 

 

 

Other Benefits

    

Service cost

   $ 615      $ 789   

Interest cost

     598        545   

Amortization of prior service cost

     (72     (125

Amortization of unrecognized loss

     129        202   
  

 

 

   

 

 

 

Net periodic benefit cost

   $ 1,270      $ 1,411