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Inventories (Tables)
3 Months Ended
Mar. 31, 2014
Inventory Disclosure [Abstract]  
Components of inventories
Components of inventories consist of the following:

 
March 31,
2014
 
December 31,
2013
Raw materials
$
10,158

 
$
9,783

Work in process
3,347

 
3,087

Finished goods
5,199

 
5,385

 
$
18,704

 
$
18,255