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Inventories (Tables)
3 Months Ended
Mar. 31, 2012
Inventory Disclosure [Abstract]  
Schedule of inventory
Inventories consist of the following:
 
December 31,
2011
 
March 31,
2012
 
 
 
 
Raw materials
$
52,351

 
$
48,756

Work-in-process
15,499

 
16,043

Finished goods
100,588

 
98,591

Total
$
168,438

 
$
163,390