Segment Reporting, Information Concerning Business Activities (Details) $ in Thousands	3 Months Ended
Mar. 31, 2018 USD ($) segment	Mar. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment	3
Total revenues	$ 387,256	$ 303,087
Segment operating (losses) earnings	1,077	(1,584)
Depreciation, depletion and amortization	2,412	3,969
Marketing
Segment Reporting Information [Line Items]
Total revenues	373,638
Inventory liquidation gains and valuation (losses)	(600)	700
Transportation
Segment Reporting Information [Line Items]
Total revenues	13,618
Reporting Segments
Segment Reporting Information [Line Items]
Total revenues	387,256	303,087
Segment operating (losses) earnings	3,360	1,053
Depreciation, depletion and amortization	2,412	3,969
Property and equipment additions	866	1,006
Reporting Segments \| Marketing
Segment Reporting Information [Line Items]
Total revenues	373,638	288,615
Segment operating (losses) earnings	2,958	1,393
Depreciation, depletion and amortization	1,497	2,069
Property and equipment additions	793	82
Reporting Segments \| Transportation
Segment Reporting Information [Line Items]
Total revenues	13,618	13,455
Segment operating (losses) earnings	402	(298)
Depreciation, depletion and amortization	915	1,591
Property and equipment additions	73	102
Reporting Segments \| Oil and Gas
Segment Reporting Information [Line Items]
Total revenues	0	1,017
Segment operating (losses) earnings	0	(42)
Depreciation, depletion and amortization	0	309
Property and equipment additions	$ 0	$ 822

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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Amount of inventory reserves for last-in first-out (LIFO) and other inventory valuation methods.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66092785&loc=d3e4492-108314

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(b))
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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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