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Inventories (Tables)
 3 Months Ended
Mar. 31, 2015
Inventories [Abstract]  
Components of inventories
The components of inventories are summarized below (in thousands):

  
March31,
2015
  
December31,
2014
 
Inventories:
    
Raw materials
 
$
19,688
  
$
18,990
 
Work in process
  
16,948
   
16,222
 
Finished goods
  
2,839
   
3,362
 
  
$
39,475
  
$
38,574