Segment Reporting - Information Concerning Business Activities (Details) $ in Thousands	3 Months Ended
Mar. 31, 2022 USD ($) segment	Mar. 31, 2021 USD ($)
Segment Reporting [Abstract]
Number of reportable segments \| segment	3
Number of operating segments \| segment	3
Segment Reporting Information [Line Items]
Revenues	$ 774,245	$ 325,491
Segment operating earnings (losses)	8,148	3,851
Depreciation and amortization	5,013	5,053
Property and equipment additions	3,694	170
Crude Oil Marketing
Segment Reporting Information [Line Items]
Revenues	747,555	304,023
Depreciation and amortization	1,788	1,798
Property and equipment additions	3,124	210
Inventory liquidation gains (losses)	8,700	6,900
Transportation
Segment Reporting Information [Line Items]
Revenues	26,690	21,235
Depreciation and amortization	2,957	3,001
Property and equipment additions	535	(58)
Pipeline and storage
Segment Reporting Information [Line Items]
Revenues	0	233
Depreciation and amortization	268	254
Property and equipment additions	27	10
Operating segments
Segment Reporting Information [Line Items]
Revenues	775,170	325,710
Segment operating earnings (losses)	12,166	7,227
Operating segments \| Crude Oil Marketing
Segment Reporting Information [Line Items]
Revenues	747,555	304,023
Segment operating earnings (losses)	10,120	7,018
Operating segments \| Transportation
Segment Reporting Information [Line Items]
Revenues	26,718	21,268
Segment operating earnings (losses)	2,868	774
Operating segments \| Pipeline and storage
Segment Reporting Information [Line Items]
Revenues	897	419
Segment operating earnings (losses)	(822)	(565)
Intersegment
Segment Reporting Information [Line Items]
Revenues	(925)	(219)
Intersegment \| Crude Oil Marketing
Segment Reporting Information [Line Items]
Revenues	0	0
Intersegment \| Transportation
Segment Reporting Information [Line Items]
Revenues	(28)	(33)
Intersegment \| Pipeline and storage
Segment Reporting Information [Line Items]
Revenues	(897)	(186)
Other
Segment Reporting Information [Line Items]
Revenues	0	0
Segment operating earnings (losses)	0	0
Depreciation and amortization	0	0
Property and equipment additions	$ 8	$ 8

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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The effect of liquidating LIFO (last in first out) inventory layers on income.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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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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The net result for the period of deducting operating expenses from operating revenues.

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Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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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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