Segment Reporting - Information Concerning Business Activities (Details) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended
Aug. 31, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)
Segment Reporting [Abstract]
Number of reportable segments \| segment				3
Segment Reporting Information [Line Items]
Revenues		$ 467,891	$ 295,311	$ 1,307,564	$ 913,600
Segment operating (losses) earnings		2,239	(1,290)	7,614	(2,255)
Depreciation, depletion and amortization		2,340	3,240	7,014	10,772
Property and equipment acquired under capital leases				1,208	1,808
Voluntary early retirement program expense	$ 400		1,000		1,000
Leasehold Improvements
Segment Reporting Information [Line Items]
Property and equipment additions				13
Marketing
Segment Reporting Information [Line Items]
Revenues		453,626		1,266,055
Inventory liquidation gains and valuation (losses)		100	(2,000)	2,500	(100)
Transportation
Segment Reporting Information [Line Items]
Revenues		14,265		41,509
Reporting Segments
Segment Reporting Information [Line Items]
Revenues		467,891	295,311	1,307,564	913,600
Segment operating (losses) earnings		3,772	1,497	13,714	4,629
Depreciation, depletion and amortization		2,340	3,240	7,014	10,772
Property and equipment additions		5,028	357	7,756	2,465
Reporting Segments \| Marketing
Segment Reporting Information [Line Items]
Revenues		453,626	282,229	1,266,055	872,020
Segment operating (losses) earnings		2,982	2,412	11,712	5,496
Depreciation, depletion and amortization		1,277	1,911	4,110	5,957
Property and equipment additions		612	178	1,682	451
Reporting Segments \| Transportation
Segment Reporting Information [Line Items]
Revenues		14,265	13,082	41,509	40,153
Segment operating (losses) earnings		790	(915)	2,002	(920)
Depreciation, depletion and amortization		1,063	1,329	2,904	4,392
Property and equipment additions		4,416	179	6,061	189
Reporting Segments \| Oil and Gas
Segment Reporting Information [Line Items]
Revenues		0	0	0	1,427
Segment operating (losses) earnings		0	0	0	53
Depreciation, depletion and amortization		0	0	0	423
Property and equipment additions		$ 0	$ 0	$ 13	$ 1,825

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- Definition

The increase during the period in capital lease obligations due to entering into new capital leases.

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-Name Accounting Standards Codification
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
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- Definition

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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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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