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Inventories (Tables)
 6 Months Ended
Jun. 30, 2015
Inventory Disclosure [Abstract]  
Components of Inventories
The components of inventories consisted of the following as of the respective periods:
(in thousands)
June 30,
2015
 
December 31,
2014
Raw materials
$
17,383

 
$
16,749

Work in process
13,122

 
15,652

Inventories
$
30,505

 
$
32,401