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6. PROPERTY, PLANT AND EQUIPMENT UNDER CAPITAL LEASES, NET (Tables)
 12 Months Ended
Dec. 31, 2017
Property Plant And Equipment Under Capital Leases Net  
Property, plant and equipment under capital leases
    As of December 31,
    2017   2016
At cost:                
Buildings   $ 125,939     $ 118,623  
Plant and machinery     2,314,196       2,229,775  
Total     2,440,135       2,348,398  
Less: accumulated depreciation and amortization     (1,947,897 )     (1,794,141 )
Net book value   $ 492,238     $ 554,257