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Inventories, net
3 Months Ended
Mar. 31, 2012
Inventories [Abstract]  
Inventories, net
3. Inventories, net
   
March 31, 2012
  
December 31, 2011
 
Raw materials
 $416,050  $372,627 
Work in progress
  187,479   177,016 
Finished goods
  330,466   309,048 
Subtotal
  933,995   858,691 
Less LIFO reserve
  53,552   55,345 
Total
 $880,443  $803,346