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PREPAID EXPENSE AND OTHER CURRENT ASSETS (Tables)
12 Months Ended
Dec. 31, 2015
PREPAID EXPENSE AND OTHER CURRENT ASSETS [Abstract]  
Schedule of Prepaid Expense and Other Current Assets
  December 31,  
    2014     2015  
Spare parts   $ 6,385,388     $ 6,052,315  
Prepaid Value added tax (“VAT”)     5,857,017       5,552,772  
Prepaid insurance fee     226,564       347,631  
Others     366,900       282,423  
Total   $ 12,835,869     $ 12,235,141