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Net Inventories (Tables)
 9 Months Ended
Sep. 30, 2013
Net Inventories [Abstract]  
Net Inventories
Net inventories at September 30, 2013 and December 31, 2012 consist of the following:
 
 
 
September 30,
  
December 31,
 
 
 
2013
  
2012
 
 
 
  
 
Finished goods
 
$
35,369
  
$
30,262
 
Work in process
  
40,260
   
23,533
 
Raw materials
  
20,437
   
12,352
 
Supplies
  
5,341
   
5,074
 
Total
 
$
101,407
  
$
71,221