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