Voluntary Early Retirement Program Expense

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228

Reference 2: 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

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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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

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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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

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

+ References

No definition available.

+ Details

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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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- Definition

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.

+ References

No definition available.

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Segment Reporting - Information concerning business activities (Details) $ in Thousands	1 Months Ended	3 Months Ended								12 Months Ended
	Aug. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment										3
Revenues		$ 408,460	$ 295,311	$ 315,202	$ 303,087	$ 298,969	$ 256,877	$ 293,163	$ 250,531	$ 1,322,060	$ 1,099,540	$ 1,944,279
Operating earnings (losses)										1,502	6,054	(2,359)
Depreciation, depletion and amortization										13,599	18,792	23,717
Property and equipment additions										2,644	8,484	11,074
Voluntary early retirement program expense	$ 400									1,000
Property and equipment acquired under capital leases										1,808	0	0
Marketing [Member]
Segment Reporting Information [Line Items]
Revenues										1,267,275	1,043,775	1,875,885
Depreciation, depletion and amortization										7,812	9,997	11,097
Property and equipment additions										468	1,321	2,126
Inventory liquidation gains and valuation (losses)		$ 3,300				$ 8,200				3,300	8,200	5,400
Transportation [Member]
Segment Reporting Information [Line Items]
Revenues										53,358	52,355	63,331
Depreciation, depletion and amortization										5,364	7,249	7,554
Property and equipment additions										351	6,868	6,579
Oil and Gas [Member]
Segment Reporting Information [Line Items]
Revenues										1,427	3,410	5,063
Depreciation, depletion and amortization										423	1,546	5,066
Property and equipment additions										1,825	295	2,369
Property impairments												12,100
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating earnings (losses)										11,209	16,464	7,580
Operating Segments [Member] \| Marketing [Member]
Segment Reporting Information [Line Items]
Operating earnings (losses)										11,700	17,045	22,895
Operating Segments [Member] \| Transportation [Member]
Segment Reporting Information [Line Items]
Operating earnings (losses)										(544)	(48)	3,701
Operating Segments [Member] \| Oil and Gas [Member]
Segment Reporting Information [Line Items]
Operating earnings (losses)										$ 53	$ (533)	$ (19,016)