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Major Customers and Suppliers (Details)	12 Months Ended
	Dec. 31, 2012 item	Dec. 31, 2011 item	Dec. 31, 2010 item
Sales | Customer concentration | Petroleum
Major Customers and Suppliers
Concentration risk (as a percent)	27.00%	36.00%	35.00%
Sales | Customer concentration | Petroleum | Customer A
Major Customers and Suppliers
Concentration risk (as a percent)	10.00%	15.00%	14.00%
Sales | Customer concentration | Petroleum | Customer B
Major Customers and Suppliers
Concentration risk (as a percent)	9.00%	12.00%	11.00%
Sales | Customer concentration | Petroleum | Customer C
Major Customers and Suppliers
Concentration risk (as a percent)	8.00%	9.00%	10.00%
Sales | Customer concentration | Nitrogen Fertilizer
Major Customers and Suppliers
Concentration risk (as a percent)	20.00%	29.00%	22.00%
Sales | Customer concentration | Nitrogen Fertilizer | Customer D
Major Customers and Suppliers
Concentration risk (as a percent)	10.00%	17.00%	12.00%
Sales | Customer concentration | Nitrogen Fertilizer | Customer E
Major Customers and Suppliers
Concentration risk (as a percent)	10.00%	12.00%	10.00%
Total cost of products sold (exclusive of depreciation and amortization) | Supplier concentration | Petroleum
Major Customers and Suppliers
Number of major suppliers	1	1	1
Total cost of products sold (exclusive of depreciation and amortization) | Supplier concentration | Petroleum | Supplier A
Major Customers and Suppliers
Concentration risk (as a percent)	45.00%	65.00%	64.00%
Direct operating expenses (exclusive of depreciation and amortization) | Supplier concentration | Nitrogen Fertilizer
Major Customers and Suppliers
Number of major suppliers	1	1	1
Direct operating expenses (exclusive of depreciation and amortization) | Supplier concentration | Nitrogen Fertilizer | Supplier B
Major Customers and Suppliers
Concentration risk (as a percent)	5.00%	5.00%	5.00%

X

- Definition

Represents the number of major suppliers.

+ References

No definition available.

+ Details

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- Details

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X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13537-108611



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13531-108611



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

+ Details

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Period Type:	instant