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PENSION AND OTHER BENEFITS (Tables)
6 Months Ended
Jun. 30, 2012
PENSION AND OTHER BENEFITS [Abstract]  
Components of net Periodic Benefit Cost for Pension and Other Postretirement Benefits (OPEB)
The following table represents the components of net periodic benefit cost for pension and other postretirement benefits (OPEB) as well as the actuarial weighted-average assumptions used in calculating net periodic benefit cost for the three and six month periods ended June 30, 2012 and 2011:

   
Three Months Ended June 30,
 
   
Pension Benefits
  
Other Postretirement Benefits
 
   
2012
  
2011
  
2012
  
2011
 
   
(In Thousands)
 
Components of net periodic benefit cost:
            
Service cost
 $3,008  $3,144  $401  $540 
Interest cost
  10,368   10,121   1,562   1,659 
Expected return on plan assets
  (11,219)  (10,647)  (626)  (741)
Amortization of:
                
Prior service costs
  162   160   (17)  (26)
Transition obligation  (asset)
  -   -   98   255 
Actuarial (gain) loss
  3,294   3,509   241   502 
Net periodic benefit cost
 $5,613  $6,287  $1,659  $2,189 

   
Six Months Ended June 30,
 
   
Pension Benefits
  
Other Postretirement Benefits
 
   
2012
  
2011
  
2012
  
2011
 
   
(In Thousands)
 
Components of net periodic benefit cost:
            
Service cost
 $6,016  $6,287  $802  $1,081 
Interest cost
  20,736   20,242   3,124   3,318 
Expected return on plan assets
  (22,438)  (21,294)  (1,252)  (1,482)
Amortization of:
                
Prior service costs
  324   321   (34)  (51)
Transition obligation  (asset)
  -   -   196   510 
Actuarial (gain) loss
  6,588   7,016   482   1,004 
Net periodic benefit cost
 $11,226  $12,572  $3,318  $4,380 

   
Three and Six Months Ended June 30,
 
   
Pension Benefits
  
Other Postretirement Benefits
 
   
2012
  
2011
  
2012
  
2011
 
Discount rate
  5.05% - 5.30%  5.10% - 5.35%  5.05% - 5.30%  5.15% - 5.30%
Average wage increase
  3.50% - 3.80%  3.50% - 3.80%  N/A   N/A 
Return on plan assets
  7.75% - 8.00%  8.25% - 8.50%  5.56% - 8.00%  6.83% - 8.25%
Composite health care trend rate (current year)
  N/A   N/A   8.00%  7.80% - 8.50%
Composite health care trend rate (2018 forward)
  N/A   N/A   5.00%  4.50% - 5.00%
 
N/A - not applicable