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6. PROPERTY, PLANT AND EQUIPMENT UNDER CAPITAL LEASES, NET (Tables)
3 Months Ended
Mar. 31, 2018
Property Plant And Equipment Under Capital Leases Net  
Property, plant and equipment under capital leases
    March 31,
2018
  December 31,
2017
At cost:                
Buildings   $ 130,868     $ 125,939  
Plant and machinery     2,404,774       2,314,196  
Total     2,535,642       2,440,135  
Less: Accumulated depreciation and amortization     (2,050,782 )     (1,947,897 )
Net book value   $ 484,860     $ 492,238