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INVENTORIES (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Inventories      
Raw materials $ 40,197,952 $ 50,062,944  
Work-in-process 16,739,907 49,157,454  
Finished goods 217,517,939 197,347,729  
Inventories 274,455,798 296,568,127  
Inventory written down $ 3,085,529 $ 8,456,260 $ 2,101,124