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INVENTORIES (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Inventories      
Raw materials $ 95,223,795us-gaap_InventoryRawMaterialsNetOfReserves $ 52,610,348us-gaap_InventoryRawMaterialsNetOfReserves  
Work-in-process 33,207,222us-gaap_InventoryWorkInProcessNetOfReserves 25,181,639us-gaap_InventoryWorkInProcessNetOfReserves  
Finished goods 303,894,102us-gaap_InventoryFinishedGoodsNetOfReserves 153,365,824us-gaap_InventoryFinishedGoodsNetOfReserves  
Inventories 432,325,119us-gaap_InventoryNet 231,157,811us-gaap_InventoryNet  
Inventory written down $ 16,950,524us-gaap_InventoryWriteDown $ 714,558us-gaap_InventoryWriteDown $ 3,085,529us-gaap_InventoryWriteDown