Quarterly report pursuant to Section 13 or 15(d)

PROPERTY, PLANT AND EQUIPMENT (Details)

v3.21.1
PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment $ 292,601   $ 287,904
Less accumulated depreciation (104,678)   (100,800)
Total property, plant and equipment, net 187,923   187,104
Capitalized labor costs 300 $ 600  
Amortization relating to the platinum catalyst 300 $ 200  
Platinum catalyst metal      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment 1,580   1,580
Catalyst      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment 4,298   4,325
Land      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment 5,428   5,428
Plant, pipeline and equipment      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment 271,960   270,149
Construction in progress      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment $ 9,335   $ 6,422