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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Property, Plant and Equipment) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, plant and equipment      
Interest expense capitalized $ 0 $ 7,245,747 $ 3,429,496
Buildings and plant [Member]
     
Property, plant and equipment      
Estimated useful lives 20 years    
Machinery and equipment [Member]
     
Property, plant and equipment      
Estimated useful lives 10 years    
Furniture, fixtures and equipment [Member] | Minimum [Member]
     
Property, plant and equipment      
Estimated useful lives 3 years    
Furniture, fixtures and equipment [Member] | Maximum [Member]
     
Property, plant and equipment      
Estimated useful lives 5 years    
Motor vehicles [Member]
     
Property, plant and equipment      
Estimated useful lives 6 years