Annual report pursuant to Section 13 and 15(d)

PLANT, PIPELINE AND EQUIPMENT (Details)

v3.20.4
PLANT, PIPELINE AND EQUIPMENT (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization $ 287,904 $ 274,806  
Less accumulated depreciation (100,800) (85,887)  
Net plant, pipeline and equipment 187,104 188,919  
Interest capitalized for construction 0 0 $ 700
Capitalized labor costs 600 0 2,300
Amortization included in cost of sales 1,200 1,300 $ 100
Platinum catalyst      
Property, Plant and Equipment [Line Items]      
Total plant, pipeline and equipment 1,580 1,580  
Catalyst      
Property, Plant and Equipment [Line Items]      
Total plant, pipeline and equipment 4,325 4,095  
Land      
Property, Plant and Equipment [Line Items]      
Total plant, pipeline and equipment 5,428 5,428  
Plant, pipeline and equipment      
Property, Plant and Equipment [Line Items]      
Total plant, pipeline and equipment 270,149 258,651  
Construction in progress      
Property, Plant and Equipment [Line Items]      
Total plant, pipeline and equipment $ 6,422 $ 5,052