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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Property, Plant and Equipment) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Property, plant and equipment |  |  |
Interest expense capitalized | $ 2,825,879 | $ 1,960,259 |
Depreciation of property, plant and equipment | 31,361,026 | 28,007,943 | $ 52,250,595
Net (loss) income | $ 13,047,584 | $ 16,649,176 | $ (221,090,508)
Basic income per share | $ 0.05 | $ 0.08 | $ (0.41)
Service Life [Member] |  |  |
Property, plant and equipment |  |  |
Depreciation of property, plant and equipment | $ (18,700,000) | $ (18,700,000) |
Net (loss) income | $ 18,700,000 | $ 18,700,000 |
Basic income per share | $ 0.07 | $ 0.09 |
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=56944662&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 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 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 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 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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