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Commitments and Contingencies Contracts and Agreements (Details)	3 Months Ended
	Mar. 31, 2017 bbl / pure
Noble Petro, Inc. [Member] | Abilene Contract [Member] | Inventories [Member]
Other Commitments [Line Items]
Maximum Purchases under Supply Contract (bpd)	20,350

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- Definition

Maximum Purchases under Supply Contract

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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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