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Segment Information (Narrative) (Details) - segment | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Concentration Risk [Line Items] |  |
Number of reportable operating segments | 2 |
Sales Revenue, Net [Member] | Glencore [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage |  | 6.00%
Sales Revenue, Net [Member] | Mercuria [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 14.00% | 94.00%
Sales Revenue, Net [Member] | ExxonMobil [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 86.00% |

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