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Pension plans and other postretirement benefits (Tables)
9 Months Ended
Sep. 30, 2012
Net Periodic Benefit Cost for Defined Benefit Plans

The Company provides defined benefit pension and other postretirement benefits (including health care and life insurance benefits) to qualified retired employees. Net periodic defined benefit cost for defined benefit plans consisted of the following:

 

     Pension benefits     Other
postretirement

benefits
 
     Three months ended September 30  
     2012     2011     2012      2011  
           (in thousands)         

Service cost

   $ 7,387        8,557        167         148   

Interest cost on projected benefit obligation

     15,509        16,155        934         1,038   

Expected return on plan assets

     (17,627     (16,718     —           —     

Amortization of prior service cost

     (1,640     (1,640     5         27   

Amortization of net actuarial loss

     9,291        5,132        133         9   
  

 

 

   

 

 

   

 

 

    

 

 

 

Net periodic benefit cost

   $ 12,920        11,486        1,239         1,222   
  

 

 

   

 

 

   

 

 

    

 

 

 
     Pension benefits     Other
postretirement
benefits
 
     Nine months ended September 30  
     2012     2011     2012      2011  
           (in thousands)         

Service cost

   $ 22,162        20,270        501         388   

Interest cost on projected benefit obligation

     46,527        42,391        2,803         2,722   

Expected return on plan assets

     (52,883     (43,981     —           —     

Amortization of prior service cost

     (4,919     (4,919     15         81   

Amortization of net actuarial loss

     27,874        15,397        398         27   
  

 

 

   

 

 

   

 

 

    

 

 

 

Net periodic benefit cost

   $ 38,761        29,158        3,717         3,218