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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%

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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