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PENSION BENEFITS (Tables)
9 Months Ended
Sep. 30, 2011
PENSION BENEFITS [Abstract] 
Components of Net Periodic Benefit Cost
The following table presents the components of net periodic benefit costs for the periods indicated:

   
Three months ended
  
Nine months ended
 
   
September 30,
  
September 30,
 
   
2011
  
2010
  
2011
  
2010
 
   
(In thousands)
 
Service cost
 $1,898  $1,863  $6,062  $5,587 
Interest cost
  2,214   1,919   6,270   5,757 
Expected return on assets
  (3,745)  (3,508)  (11,171)  (10,524)
Amortization of unrecognized transition amount
  4   5   14   13 
Recognized prior service cost
  52   85   152   255 
Recognized net loss
  891   555   2,047   1,663 
Net periodic benefit costs
 $1,314  $919  $3,374  $2,751