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Pension plans and other postretirement benefits (Tables)
3 Months Ended
Mar. 31, 2014
Compensation And Retirement Disclosure [Abstract]  
Net Periodic Pension Expense for Defined Benefit Plans

Net periodic benefit cost for defined benefit plans consisted of the following:

 

     Pension
benefits
    Other
postretirement
benefits
 
     Three months ended March 31  
     2014     2013     2014     2013  
     (in thousands)  

Service cost

   $ 5,100        6,050        150        200   

Interest cost on projected benefit obligation

     17,250        15,126        675        675   

Expected return on plan assets

     (22,925     (21,875     —          —     

Amortization of prior service credit

     (1,650     (1,650     (350     (350

Amortization of net actuarial loss

     3,350        10,400        —          100   
  

 

 

   

 

 

   

 

 

   

 

 

 

Net periodic benefit cost

   $ 1,125        8,051        475        625