XML 65 R31.htm IDEA: XBRL DOCUMENT v3.20.1
PROPERTY AND EQUIPMENT. (Tables)
12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Schedule of property and equipment
   December 31, 
   2019   2018 
Facilities and plant equipment  $495,513   $621,909 
Land   7,219    8,970 
Other equipment, vehicles and furniture   11,229    11,812 
Construction in progress   15,793    30,312 
    529,754    673,003 
Accumulated depreciation   (197,228)   (190,346)
   $332,526   $482,657