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Inventories (Tables)
 12 Months Ended
Dec. 31, 2014
Inventory Disclosure [Abstract]  
Components of Inventories
The components of inventories as of December 31 were as follows:
(in thousands)
2014
 
2013
Raw materials
$
16,749

 
$
14,825

Work in process
15,652

 
13,168

Inventories
$
32,401

 
$
27,993