Annual report pursuant to Section 13 and 15(d)

6. PROPERTY AND EQUIPMENT (Tables)

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6. PROPERTY AND EQUIPMENT (Tables)
12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Property and equipment
    December 31,  
    2016     2015  
Facilities and plant equipment   $ 530,735     $ 501,800  
Land     7,771       7,541  
Other equipment, vehicles and furniture     9,714       9,084  
Construction in progress     29,393       23,579  
      577,613       542,004  
Accumulated depreciation     (112,423 )     (77,044 )
    $ 465,190     $ 464,960