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Inventories
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Inventories

Note 4. Inventories

The components of inventories consisted of the following:

 

 

 

December 31,

 

(in thousands)

 

2017

 

 

2016

 

Raw materials

 

$

17,550

 

 

$

16,846

 

Work in process

 

 

12,822

 

 

 

14,574

 

Inventories

 

$

30,372

 

 

$

31,420