Property and Equipment. (Tables)

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

Schedule of property and equipment

	December 31,
	2020			2019
Facilities and plant equipment	$	357,740		$	495,513
Land		4,837			7,219
Other equipment, vehicles and furniture		7,858			11,229
Construction in progress		11,828			15,793
		382,263			529,754
Accumulated depreciation		(152,777	)		(197,228	)
	$	229,486		$	332,526