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

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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- Definition Amount of interest capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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