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Inventories
9 Months Ended
Sep. 30, 2011
Inventories [Abstract] 
Inventories
4.   Inventories
 
The Corporation’s inventories at September 30, 2011 and December 31, 2010 were:
 
                 
    September 30,
 		    December 31,
 		 
    2011     2010  
 
(In thousands)
               
Finished goods
  $ 121,335     $ 106,998  
Work-in-process
    33,310       23,636  
Raw materials
    121,513       89,616  
                 
Total inventories
  $ 276,158     $ 220,250