Quarterly report pursuant to Section 13 or 15(d)

Segment Information (Narrative) (Details)

v3.20.1
Segment Information (Narrative) (Details) - segment
3 Months Ended 12 Months Ended
Mar. 31, 2020
Jan. 31, 2020
Concentration Risk [Line Items]    
Number of reportable operating segments 2  
Sales Revenue, Net [Member] | Glencore and Mercuria [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage   100.00%
Sales Revenue, Net [Member] | Mercuria [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage 52.00%  
Sales Revenue, Net [Member] | Exxon [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage 48.00%