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COMMITMENTS AND CONTINGENCIES (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Operating lease commitments |  |  |
Rental expenses | $ 8,618,436 | $ 5,444,078 | $ 2,916,591
Future minimum lease payments under non-cancelable operating lease agreements |  |  |
2013 | 4,691,218 |  |
2014 | 2,875,459 |  |
2015 | 1,729,320 |  |
2016 | 1,356,324 |  |
Thereafter | 4,912,165 |  |
Total | 15,564,486 |  |
Property, plant and equipment purchase commitments |  |  |
Short-term commitments for the purchase of property, plant and equipment | 3,205,562 |  |
Supply purchase commitments |  |  |
Total purchases under the long-term agreements | 143,109,363 | 190,901,780 | 78,567,563
Future minimum obligation using market prices under all supply agreements |  |  |
2013 | 247,700,752 |  |
2014 | 247,700,752 |  |
2015 | 341,037,267 |  |
Total | $ 836,438,771 |  |
Minimum |  |  |
Operating lease commitments |  |  |
Remaining lease terms | 1 month |  |
Maximum |  |  |
Operating lease commitments |  |  |
Remaining lease terms | 104 months |  |

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