Quarterly report pursuant to Section 13 or 15(d)

PLANT, PIPELINE AND EQUIPMENT (Details)

v3.8.0.1
PLANT, PIPELINE AND EQUIPMENT (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Property, Plant and Equipment [Line Items]          
Total plant, pipeline and equipment $ 233,442   $ 233,442   $ 194,486
Less accumulated depreciation (61,394)   (61,394)   (54,477)
Net plant, pipeline and equipment 172,048   172,048   140,009
Interest capitalized for construction 218 $ 52 878 $ 124  
Amortization relating to the platinum catalyst 0 $ 25 25 $ 72  
Platinum Catalyst Metal [Member]          
Property, Plant and Equipment [Line Items]          
Total plant, pipeline and equipment 1,612   1,612   1,612
Land [Member]          
Property, Plant and Equipment [Line Items]          
Total plant, pipeline and equipment 5,428   5,428   5,376
Plant, Pipeline and Equipment [Member]          
Property, Plant and Equipment [Line Items]          
Total plant, pipeline and equipment 183,472   183,472   154,107
Construction in Progress [Member]          
Property, Plant and Equipment [Line Items]          
Total plant, pipeline and equipment $ 42,930   $ 42,930   $ 33,391