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Inventories (Tables)
 3 Months Ended
Mar. 31, 2014
Inventories [Abstract]  
Components of inventories
The components of inventories are summarized below (in thousands):

 
 
March 31,
  
December 31,
 
 
 
2014
  
2013
 
Inventories:
 
  
 
Raw materials
 
$
19,873
  
$
21,063
 
Work in process
  
14,396
   
14,027
 
Finished goods
  
3,771
   
4,037
 
 
 
$
38,040
  
$
39,127