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PREPAID EXPENSE AND OTHER CURRENT ASSETS (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
PREPAID EXPENSE AND OTHER CURRENT ASSETS [Abstract]    
Spare parts $ 6,385,388us-gaap_OtherInventoriesSpareParts $ 6,264,805us-gaap_OtherInventoriesSpareParts
Prepaid Value added tax ("VAT") 5,857,017us-gaap_PrepaidTaxes 15,273,592us-gaap_PrepaidTaxes
Prepaid insurance fee 226,564us-gaap_PrepaidInsurance 218,865us-gaap_PrepaidInsurance
Others 366,900us-gaap_OtherAssetsCurrent 2,113,428us-gaap_OtherAssetsCurrent
Total $ 12,835,869us-gaap_PrepaidExpenseAndOtherAssetsCurrent $ 23,870,690us-gaap_PrepaidExpenseAndOtherAssetsCurrent