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Inventories
12 Months Ended
Dec. 31, 2014
Inventories [Abstract]  
Inventories
(2) Inventories

The following table presents the details of inventories as of December 31, 2014 and 2013 (in thousands):

  
December 31,
2014
  
December 31,
2013
 
Finished goods
 
$
179,760
  
$
120,751
 
Work in process
  
12,594
   
15,136
 
  
$
192,354
  
$
135,887