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Inventories (Tables)
 9 Months Ended
Sep. 30, 2014
Inventory Disclosure [Abstract]  
Components of Inventories
The components of inventories consisted of the following as of the respective periods:
(in thousands)
September 30,
2014
 
December 31,
2013
Raw materials
$
17,610

 
$
14,825

Work in process
19,242

 
13,168

Inventories
$
36,852

 
$
27,993