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Inventories (Tables)
 9 Months Ended
Sep. 30, 2014
Inventories [Abstract]  
Components of inventories
The components of inventories are summarized below (in thousands):
 
  
September 30,
  
December 31,
 
  
2014
  
2013
 
Inventories:
    
Raw materials
 
$
19,249
  
$
21,063
 
Work in process
  
14,372
   
14,027
 
Finished goods
  
3,027
   
4,037
 
  
$
36,648
  
$
39,127