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PREPAID EXPENSE AND OTHER CURRENT ASSETS (Tables)
12 Months Ended
Dec. 31, 2013
PREPAID EXPENSE AND OTHER CURRENT ASSETS [Abstract]  
Schedule of Prepaid Expense and Other Current Assets

Prepaid expense and other current assets consist of the following:

    December 31,  
    2012     2013  
Spare parts   $ 3,975,860     $ 6,264,805  
Prepaid Value added tax ("VAT")     18,705,984       13,546,880  
Prepaid insurance fee     471,721       1,016,625  
Others     780,402       3,042,380  
Total   $ 23,933,967     $ 23,870,690