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Retirement Benefits (Tables)
9 Months Ended
Sep. 30, 2012
Pension Benefits
 
Components of Net Periodic Benefit Costs
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  
Other Postretirement Benefits
 
Components of Net Periodic Benefit Costs
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