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Note D - Pension And Other Postretirement Benefits (Tables)
6 Months Ended
Jun. 30, 2012
Schedule of Costs of Retirement Plans [Table Text Block]
   
Pension Benefits
   
Postretirement Benefits
 
(Thousands of dollars)
 
Three Months Ended
June 30,
   
Three Months Ended
June 30,
 
   
2012
   
2011
   
2012
   
2011
 
Service cost
  $ 797     $ 714     $ 289     $ 263  
Interest cost
    701       767       217       277  
Expected return on plan assets
    (1,147 )     (1,128 )     -       -  
Recognized actuarial loss (gain)
    610       419       (162 )     (164 )
Net periodic benefit cost
  $ 961     $ 772     $ 344     $ 376  
   
Pension Benefits
   
Postretirement Benefits
 
(Thousands of dollars)
 
Six Months Ended 
June 30,
   
Six Months Ended
June 30,
 
   
2012
   
2011
   
2012
   
2011
 
Service cost
  $ 1,594     $ 1,428     $ 578     $ 526  
Interest cost
    1,402       1,534       435       554  
Expected return on plan assets
    (2,295 )     (2,256 )     -       -  
Recognized actuarial loss (gain)
    1,220       838       (324 )     (328 )
Net periodic benefit cost
  $ 1,921     $ 1,544     $ 689     $ 752