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Inventory - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Inventory [Line Items]
Inventory write-down	$ 0		$ 0
Crude oil inventory
Inventory [Line Items]
Inventory write-down		$ 0		$ 7,200,000
Long-term linefill inventory
Inventory [Line Items]
Inventory write-down		0		1,300,000
Equipment and materials
Inventory [Line Items]
Inventory write-down		$ 600,000		$ 1,600,000

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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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- Definition

Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=116847112&loc=d3e4542-108314

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