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Major Customers and Credit Risk (Details) - Customer Concentration Risk - Supply And Logistics Revenues	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
ANSAC
Concentration Risk [Line Items]
Concentration risk, percentage	15.00%	13.00%
Shell Oil Company
Concentration Risk [Line Items]
Concentration risk, percentage	8.00%	11.00%	13.00%

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- Definition

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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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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