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Segment Information (Narrative) (Details) - segment | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 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 | 26.00% |
Sales Revenue, Net [Member] | Exxon [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 74.00% |

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