Segment Reporting, Information Concerning Business Activities (Details) $ in Thousands	3 Months Ended
Mar. 31, 2017 USD ($) Segment	Mar. 31, 2016 USD ($)
Segment Reporting [Abstract]
Number of reporting segments \| Segment	3
Revenues	$ 303,087	$ 250,531
Depreciation, depletion and amortization	3,969	5,115
Reportable Segments [Member]
Segment Reporting [Abstract]
Revenues	303,087	250,531
Segment operating (loss) earnings	1,053	4,539
Depreciation, depletion and amortization	3,969	5,115
Property and equipment additions	1,006	4,210
Reportable Segments [Member] \| Marketing [Member]
Segment Reporting [Abstract]
Revenues	288,615	236,394
Segment operating (loss) earnings	1,393	4,648
Depreciation, depletion and amortization	2,069	2,689
Property and equipment additions	82	263
Reportable Segments [Member] \| Transportation [Member]
Segment Reporting [Abstract]
Revenues	13,455	13,347
Segment operating (loss) earnings	(298)	173
Depreciation, depletion and amortization	1,591	1,985
Property and equipment additions	102	3,817
Reportable Segments [Member] \| Oil and Gas [Member]
Segment Reporting [Abstract]
Revenues	1,017	790
Segment operating (loss) earnings	(42)	(282)
Depreciation, depletion and amortization	309	441
Property and equipment additions	$ 822	$ 130

Operating earnings excluding general and administrative.

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- Definition

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.

+ References

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=66902209&loc=d3e3602-108585

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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.

+ References

No definition available.

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- Definition

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.

+ References

No definition available.

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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).

+ 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)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- References

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