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Retirement Benefits
 9 Months Ended
Sep. 30, 2012
Retirement Benefits
Note 7.    Retirement Benefits

The components of the net periodic pension benefit costs are as follows:

   
Three Months Ended
  
Nine Months Ended
   
Sept. 30,
  
Sept. 30,
  
Sept. 30,
  
Sept. 30,
   
2012
  
2011
  
2012
  
2011
   
(Dollars in thousands)
                         
Service cost
   $  3,690     $  2,925     $  11,089     $  10,435  
Interest cost
     6,688       7,162       20,517       21,477  
Expected return on plan assets
     (12,127 )     (10,213 )     (34,441 )     (30,613 )
Amortization of prior service cost
     395       512       1,348       1,533  
Amortization of actuarial losses
     2,950       2,105       9,126       6,090  
Curtailment gain
      -       (449 )      -        (449 )
Net periodic benefit cost
   $  1,596     $  2,042     $  7,639     $  8,473  

The components of the net periodic other postretirement benefits costs are as follows:

   
Three Months Ended
  
Nine Months Ended
   
Sept. 30,
  
Sept. 30,
  
Sept. 30,
  
Sept. 30,
   
2012
  
2011
  
2012
  
2011
   
(Dollars in thousands)
                         
Service cost
   $ 156     $ 129     $ 611     $ 647  
Interest cost
     435       514       1,575       1,829  
Amortization of prior service credit
     (655 )     (650 )     (1,963 )     (1,935 )
Amortization of actuarial (gains) losses
     (138 )     (191 )     4       93  
Net periodic benefit (credit) cost
   $ (202 )   $ (198 )   $ 227     $ 634  

As previously disclosed in our consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2011, there are no significant minimum required contributions to our pension plans in 2012.  In the first nine months of 2012, we made voluntary contributions to our domestic pension benefit plans of $76.0 million.