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Inventories (Tables)
 9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Components of Inventories

The components of inventories consisted of the following:

 

 

 

September 30,

 

 

December 31,

 

(in thousands)

 

2017

 

 

2016

 

Raw materials

 

$

18,455

 

 

$

16,846

 

Work in process

 

 

21,298

 

 

 

14,574

 

Inventories

 

$

39,753

 

 

$

31,420