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PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
12 Months Ended
Dec. 31, 2014
PROPERTY, PLANT AND EQUIPMENT, NET [Abstract]  
Schedule of Property, Plant and Equipment, Net

Property, plant and equipment, net, consist of the following:

 

  December 31,
    2013     2014  
Cost                
Buildings and plant   $ 235,690,310     $ 233,230,935  
Machinery and equipment     355,429,064       351,409,724  
Furniture, fixtures and equipment     21,329,752       18,469,913  
Motor vehicles     262,562       257,408  
Less: Accumulated depreciation     (145,031,744 )     (169,264,463 )
Property, plant and equipment, net   $ 467,679,944     $ 434,103,517  
Construction in process     20,824,239       124,902,602  
                 
Total   $ 488,504,183     $ 559,006,119