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Inventories (Tables)
6 Months Ended
Jun. 30, 2015
Inventories [Abstract]  
Components of inventories
The components of inventories are summarized below (in thousands):
 
  
June 30,
2015
  
December 31,
2014
 
Inventories:
    
Raw materials
 
$
20,549
  
$
18,990
 
Work in process
  
15,847
   
16,222
 
Finished goods
  
2,505
   
3,362
 
  
$
38,901
  
$
38,574