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Inventories
 9 Months Ended
Sep. 30, 2015
Inventory Disclosure [Abstract]  
Inventories
Inventories
The components of inventories consisted of the following as of the respective periods:
(in thousands)
September 30,
2015
 
December 31,
2014
Raw materials
$
14,646

 
$
16,749

Work in process
24,013

 
15,652

Inventories
$
38,659

 
$
32,401