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Net Inventories
6 Months Ended
Jun. 30, 2011
Net Inventories [Abstract]  
Net Inventories
(3)       Net Inventories
 
Inventories are stated at the lower of cost, determined on a first-in, first-out basis, or market.
 
Net inventories at June 30, 2011 and December 31, 2010 consist of the following:
 
   
June 30,
  
December 31,
 
   
2011
  
2010
 
        
Finished goods
 $28,771  $26,731 
Work in process
  20,083   17,852 
Raw materials
  14,036   12,183 
Supplies
  5,071   4,642 
Total
 $67,961  $61,408