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PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment, Net [Abstract]  
Schedule of Property, Plant and Equipment, Net
Property, plant and equipment, net, consist of the following:
 
 
 
December 31,
 
 
 
2017
 
 
2018
 
Cost
 
 
 
 
 
 
Buildings and plant
 
$
313,210,971
 
 
$
322,914,381
 
Machinery and equipment
 
 
237,606,822
 
 
 
335,808,916
 
Furniture, fixtures and equipment
 
 
23,035,493
 
 
 
25,953,939
 
Motor vehicles
 
 
254,630
 
 
 
582,375
 
Less: Accumulated depreciation
 
 
(109,191,519
)
 
 
(131,106,712
)
Property, plant and equipment, net
 
$
464,916,397
 
 
$
554,152,899
 
Construction in process
 
 
20,550,020
 
 
 
57,463,560
 
Total
 
$
485,466,417
 
 
$
611,616,459