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Inventories (Tables)
 6 Months Ended
Jun. 30, 2014
Inventory Disclosure [Abstract]  
Components of Inventories
The components of inventories consisted of the following as of the respective periods:
(in thousands)
June 30,
2014
 
December 31,
2013
Raw materials
$
16,091

 
$
14,825

Work in process
23,927

 
13,168

Inventories
$
40,018

 
$
27,993