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Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2013
Compensation And Retirement Disclosure [Abstract]  
Components of Net Periodic Benefits Cost

The following table shows the components of net periodic benefits cost included in expense for the plans.

 

     Three Months Ended March 31,  
     2013     2012     2013      2012  
                 Other Post-  
     Pension benefits     retirement Benefits  

Service cost

    $ 3,929      $ 3,247      $ 55       $ 48   

Interest cost

      3,944        4,302        330         361   

Expected return on plan assets

      (6,263 )      (6,297 )      —           —     

Amortization of prior service cost

      —          —          —           (14 ) 

Amortization of net loss

      1,745        1,645        38         177   

Amortization of transition obligation

      —          —          —           1   
  

 

 

    

 

 

    

 

 

     

 

 

  

Net periodic benefit cost

    $ 3,355      $ 2,897      $ 423       $ 573