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PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
12 Months Ended
Dec. 31, 2016
PROPERTY, PLANT AND EQUIPMENT, NET [Abstract]  
Schedule of Property, Plant and Equipment, Net
 
 
December 31,
 
 
 
2015
 
2016
 
Cost
 
 
 
 
 
 
 
Buildings and plant
 
$
313,290,516
 
$
286,302,082
 
Machinery and equipment
 
 
389,373,554
 
 
371,703,665
 
Furniture, fixtures and equipment
 
 
22,418,768
 
 
21,355,517
 
Motor vehicles
 
 
293,331
 
 
334,025
 
Less: Accumulated depreciation
 
 
(188,680,279)
 
 
(206,725,215)
 
Property, plant and equipment, net
 
$
536,695,889
 
$
472,970,074
 
Construction in process
 
 
7,630,236
 
 
84,457,810
 
Total
 
$
544,326,125
 
$
557,427,884