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Pension Benefit and Other Postretirement Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2012
Components of Net Periodic Benefit Cost
The components of net periodic benefit cost for the periods indicated are:
 
(Dollars in thousands)
 
(Dollars in thousands)
                                               
   
Pension Benefits
   
Retirement Health and Life Insurance Benefits
 
   
Three Months Ended
   
Six Months Ended
   
Three Months Ended
   
Six Months Ended
 
Change in benefit obligation:
 
June 30,
   
June 30,
   
June 30,
   
June 30,
   
June 30,
   
June 30,
   
June 30,
   
June 30,
 
   
2012
   
2011
   
2012
   
2011
   
2012
   
2011
   
2012
   
2011
 
                                                 
Service cost
  $ 1,108     $ 1,060     $ 2,297     $ 2,120     $ 149     $ 176     $ 331     $ 352  
Interest cost
    2,124       2,116       4,242       4,232       92       97       180       194  
Expected return on plan assets
    (2,495 )     (2,591 )     (4,903 )     (5,182 )     -       -       -       -  
Amortization of prior service cost
    116       150       232       300       (113 )     (157 )     (226 )     (314 )
Amortization of net loss
    1,442       553       2,791       1,106       66       81       181       162  
Special termination benefit
    -       -       -       -       -       -       2,300       -  
Adjustment to termination benefit
    -       -       -       -       (707 )     -       (707 )     -  
Net periodic benefit cost
  $ 2,295     $ 1,288     $ 4,659     $ 2,576     $ (513 )   $ 197     $ 2,059     $ 394