Segment Reporting, Information Concerning Business Activities (Details) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) segment	Jun. 30, 2016 USD ($)
Segment Reporting [Abstract]
Number of reportable segments \| segment			3
Revenues	$ 315,202	$ 293,163	$ 618,289	$ 543,694
Segment operating (losses) earnings	619	5,601	(965)	7,940
Depreciation, depletion and amortization	3,563	4,756	7,532	9,871
Reportable segments
Segment Reporting [Abstract]
Revenues	315,202	293,163	618,289	543,694
Segment operating (losses) earnings	2,079	7,539	3,132	12,078
Depreciation, depletion and amortization	3,563	4,756	7,532	9,871
Property and equipment additions (reductions)	1,102	602	2,108	4,812
Reportable segments \| Marketing
Segment Reporting [Abstract]
Revenues	301,176	278,529	589,791	514,923
Segment operating (losses) earnings	1,691	7,235	3,084	11,883
Depreciation, depletion and amortization	1,977	2,514	4,046	5,203
Property and equipment additions (reductions)	191	251	273	514
Reportable segments \| Transportation
Segment Reporting [Abstract]
Revenues	13,616	13,860	27,071	27,207
Segment operating (losses) earnings	293	701	(5)	874
Depreciation, depletion and amortization	1,472	1,850	3,063	3,835
Property and equipment additions (reductions)	(92)	334	10	4,151
Reportable segments \| Oil and Gas (1)
Segment Reporting [Abstract]
Revenues	410	774	1,427	1,564
Segment operating (losses) earnings	95	(397)	53	(679)
Depreciation, depletion and amortization	114	392	423	833
Property and equipment additions (reductions)	$ 1,003	$ 17	$ 1,825	$ 147

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=66902209&loc=d3e3602-108585

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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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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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