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, 2015
Property, Plant and Equipment [Abstract]  
Property and equipment
    December 31,  
    2015     2014  
Facilities and plant equipment   $ 501,800     $ 190,714  
Land     7,541       2,570  
Other equipment, vehicles and furniture     9,084       7,641  
Construction in progress     23,579       8,720  
      542,004       209,645  
Accumulated depreciation     (77,044 )     (54,343 )
    $ 464,960     $ 155,302