Quarterly report pursuant to Section 13 or 15(d)

PLANT, PIPELINE AND EQUIPMENT (Details)

v3.19.1
PLANT, PIPELINE AND EQUIPMENT (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Total plant, pipeline and equipment $ 270,444   $ 268,419
Less accumulated depreciation (77,589)   (73,762)
Net plant, pipeline and equipment 192,855   194,657
Interest capitalized for construction 0 $ 304  
Capitalized labor costs 100 1,200  
Amortization relating to the platinum catalyst 221 $ 0  
Platinum catalyst metal      
Property, Plant and Equipment [Line Items]      
Total plant, pipeline and equipment 1,580   1,612
Catalyst      
Property, Plant and Equipment [Line Items]      
Total plant, pipeline and equipment 3,396   3,131
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 255,567   253,905
Construction in progress      
Property, Plant and Equipment [Line Items]      
Total plant, pipeline and equipment $ 4,473   $ 4,343