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Retirement Plans and Other Post-Retirement Benefits
 6 Months Ended
Jun. 30, 2015
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
June 30		  

In thousands

    2015     2014  

Pension Benefits

     

Service cost

    $ 2,561      $ 2,504   

Interest cost

      5,788        6,309   

Expected return on plan assets

      (11,454 )      (10,931 ) 

Amortization of prior service cost

      761        921   

Amortization of unrecognized loss

      3,947        3,014   
  

 

 

    

 

 

  

Net periodic benefit cost

    $ 1,603      $ 1,817   
  

 

 

    

 

 

  

Other Benefits

     

Service cost

    $ 303      $ 615   

Interest cost

      436        598   

Amortization of prior service cost

      (70 )      (72 ) 

Amortization of unrecognized loss

      15        129   
  

 

 

    

 

 

  

Net periodic benefit cost

    $ 684      $ 1,270   
  

 

 

    

 

 

  

 

     Six months ended
June 30		  

In thousands

    2015     2014  

Pension Benefits

     

Service cost

    $ 5,696      $ 5,208   

Interest cost

      11,738        12,480   

Expected return on plan assets

      (22,997 )      (21,938 ) 

Amortization of prior service cost

      1,521        1,655   

Amortization of unrecognized loss

      8,453        5,954   
  

 

 

    

 

 

  

Net periodic benefit cost

    $ 4,411      $ 3,359   
  

 

 

    

 

 

  

Other Benefits

     

Service cost

    $ 716      $ 1,230   

Interest cost

      999        1,196   

Amortization of prior service cost

      (140 )      (144 ) 

Amortization of unrecognized loss

      115        258   
  

 

 

    

 

 

  

Net periodic benefit cost

    $ 1,690      $ 2,540