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PROPERTY, PLANT AND EQUIPMENT, NET (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross $ 631,703,582 $ 595,274,774  
Less: Accumulated depreciation (202,390,860) (122,078,346)  
Property, plant and equipment, excluding construction in process, net 429,312,722 473,196,428  
Property, plant and equipment, net 469,642,822 510,069,436  
Depreciation expense 80,644,322 55,104,656 30,946,035
Buildings
      
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross 166,300,361 150,147,460  
Leasehold improvements
      
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross 4,873,232 2,742,305  
Machinery
      
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross 422,895,433 413,079,111  
Furniture, fixtures and equipment
      
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross 34,611,157 26,397,638  
Motor vehicles
      
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, gross 3,023,309 2,908,260  
Construction in process
      
PROPERTY, PLANT AND EQUIPMENT, NET      
Property, plant and equipment, net $ 40,330,100 $ 36,873,008