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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Property, Plant and Equipment) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, plant and equipment      
Interest expense capitalized $ 1,960,259us-gaap_InterestCostsCapitalized    $ 7,245,747us-gaap_InterestCostsCapitalized
Depreciation of property, plant and equipment 28,007,943us-gaap_Depreciation 52,250,595us-gaap_Depreciation 37,371,791us-gaap_Depreciation
Net (loss) income 16,649,176us-gaap_ProfitLoss (221,090,508)us-gaap_ProfitLoss (115,637,415)us-gaap_ProfitLoss
Basic income per share $ 0.08us-gaap_EarningsPerShareBasic $ (0.41)us-gaap_EarningsPerShareBasic $ (0.64)us-gaap_EarningsPerShareBasic
Service Life [Member]      
Property, plant and equipment      
Depreciation of property, plant and equipment (18,700,000)us-gaap_Depreciation
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ServiceLifeMember		    
Net (loss) income $ 18,700,000us-gaap_ProfitLoss
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ServiceLifeMember		    
Basic income per share $ 0.09us-gaap_EarningsPerShareBasic
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ServiceLifeMember		    
Buildings and plant [Member]      
Property, plant and equipment      
Estimated useful lives 30 years 20 years  
Machinery and equipment [Member]      
Property, plant and equipment      
Estimated useful lives 15 years 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