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Inventories (Tables)
9 Months Ended
Sep. 30, 2013
Inventories [Abstract]  
Components of inventories
The components of inventories are summarized below (in thousands):

 
 
September 30,
  
December 31,
 
 
 
2013
  
2012
 
Raw materials
 
$
21,009
  
$
20,003
 
Work in process
  
13,265
   
15,608
 
Finished goods
  
4,102
   
4,741
 
 
 
$
38,376
  
$
40,352