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Inventories (Tables)
12 Months Ended
Dec. 31, 2013
Inventory Disclosure [Abstract]  
Components of Inventories
The components of inventories as of December 31 were as follows:
(in thousands)
2013
 
2012
Raw materials
$
14,825

 
$
16,422

Work in process
13,168

 
19,234

Inventories
$
27,993

 
$
35,656