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Net Inventories
9 Months Ended
Sep. 30, 2014
Net Inventories [Abstract]  
Net Inventories
(4)
Net Inventories

Inventories are determined on a first-in, first-out basis and stated at the lower of cost or market.

Net inventories at September 30, 2014 and December 31, 2013 consist of the following:
 
  
September 30,
  
December 31,
 
  
2014
  
2013
 
     
Finished goods
 
$
28,199
  
$
29,797
 
Work in process
  
42,220
   
31,990
 
Raw materials
  
25,634
   
22,580
 
Supplies
  
5,352
   
5,598
 
Total
 
$
101,405
  
$
89,965