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Inventories (Tables)
12 Months Ended
Dec. 31, 2013
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
As of December 31, 2012 and 2013, inventories consisted of the following:
 
 
 
December 31,
 
 
 
2012
 
2013
 
 
 
(in thousands)
 
 
 
 
 
 
 
 
Finished goods
 
$
39,988
 
53,957
 
Work in process
 
 
60,227
 
70,388
 
Raw materials
 
 
16,424
 
52,994
 
Supplies
 
 
32
 
60
 
 
 
$
116,671
 
177,399