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Inventories (Tables)
 6 Months Ended
Jun. 30, 2017
Inventories  
Components of inventories

The components of inventories are summarized below (in thousands):

 

 

 

 

 

 

 

 

 

 

 

June 30, 

 

December 31, 

 

 

    

2017

    

2016

 

Inventories:

 

 

 

 

 

 

 

Raw materials

 

$

19,870

 

$

17,485

 

Work in process

 

 

18,572

 

 

20,410

 

Finished goods

 

 

2,185

 

 

2,257

 

 

 

$

40,627

 

$

40,152