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Retirement Plans
 6 Months Ended
Jun. 30, 2012
Retirement Plans [Abstract]  
Retirement Plans
5. Retirement Plans

The following table provides the components of net periodic benefit cost for our pension plans for the three-month and six-month periods ended June 30, 2012 and 2011, respectively (in thousands):

 

                                 
    Three Months Ended     Six Months Ended  
    June 30,     June 30,  
    2012     2011     2012     2011  

Service cost

   $ 1,147     $ 1,066     $ 2,295     $ 2,132  

Interest cost

     830       753       1,660       1,506  

Expected return on plan assets

     (682 )      (616 )      (1,365 )      (1,232 ) 

Loss amortization

     576       154       1,151       308  
   

 

 

    

 

 

    

 

 

    

 

 

  

Net periodic benefit cost

   $ 1,871     $ 1,357     $ 3,741     $ 2,714  
   

 

 

    

 

 

    

 

 

    

 

 

  

During the six-month period ended June 30, 2012, we contributed $2.3 million to our pension plans. During the remainder of the year ending December 31, 2012, we expect to contribute an additional $4.6 million to our pension plans.