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PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
12 Months Ended
Dec. 31, 2015
PROPERTY, PLANT AND EQUIPMENT, NET [Abstract]  
Schedule of Property, Plant and Equipment, Net

 

  December 31,
    2014     2015  
Cost                
Buildings and plant   $ 233,230,935     $ 313,290,516  
Machinery and equipment     351,409,724       389,373,554  
Furniture, fixtures and equipment     18,469,913       22,418,768  
Motor vehicles     257,408       293,331  
Less: Accumulated depreciation     (169,264,463 )     (188,680,279 )
Property, plant and equipment, net    $ 434,103,517     $ 536,695,889  
Construction in process     124,902,602       7,630,236  
Total   $ 559,006,119     $ 544,326,125