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Business Segments (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting [Abstract]
Number of reportable segments			2
Petroleum
Segment Reporting Information [Line Items]
Intercompany sales	$ 2,300,000	$ 2,600,000	$ 4,600,000	$ 5,300,000
Intercompany cost of product sold (exclusive of depreciation and amortization)	900,000	4,000,000	6,800,000	4,000,000
Petroleum | Hydrogen
Segment Reporting Information [Line Items]
Intercompany sales	0	100,000	0	300,000
Nitrogen Fertilizer
Segment Reporting Information [Line Items]
Intercompany sales	900,000	4,000,000	6,800,000	4,000,000
Intercompany cost of product sold (exclusive of depreciation and amortization)	2,200,000	2,500,000	4,500,000	5,100,000
Cost of product sold related to the transfer of excess hydrogen	$ 0	$ 100,000	$ 0	$ 300,000

X

- Definition

Represents the cost of goods sold related to excessive transfer to other operating segments of the same entity.

+ References

No definition available.

+ Details

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- Definition

Represents the cost of goods sold to other operating segments of the same entity.

+ References

No definition available.

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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 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=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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