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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 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 + Details
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- Details
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