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Major Customers and Suppliers (Details)																						12 Months Ended					12 Months Ended
	Dec. 31, 2011 Sales Customer concentration Petroleum	Dec. 31, 2010 Sales Customer concentration Petroleum	Dec. 31, 2009 Sales Customer concentration Petroleum	Dec. 31, 2011 Sales Customer concentration Petroleum Customer A	Dec. 31, 2010 Sales Customer concentration Petroleum Customer A	Dec. 31, 2009 Sales Customer concentration Petroleum Customer A	Dec. 31, 2011 Sales Customer concentration Petroleum Customer B	Dec. 31, 2010 Sales Customer concentration Petroleum Customer B	Dec. 31, 2009 Sales Customer concentration Petroleum Customer B	Dec. 31, 2011 Sales Customer concentration Petroleum Customer C	Dec. 31, 2010 Sales Customer concentration Petroleum Customer C	Dec. 31, 2009 Sales Customer concentration Petroleum Customer C	Dec. 31, 2011 Sales Customer concentration Nitrogen Fertilizer	Dec. 31, 2010 Sales Customer concentration Nitrogen Fertilizer	Dec. 31, 2009 Sales Customer concentration Nitrogen Fertilizer	Dec. 31, 2011 Sales Customer concentration Nitrogen Fertilizer Customer D	Dec. 31, 2010 Sales Customer concentration Nitrogen Fertilizer Customer D	Dec. 31, 2009 Sales Customer concentration Nitrogen Fertilizer Customer D	Dec. 31, 2011 Sales Customer concentration Nitrogen Fertilizer Customer E	Dec. 31, 2010 Sales Customer concentration Nitrogen Fertilizer Customer E	Dec. 31, 2009 Sales Customer concentration Nitrogen Fertilizer Customer E	Dec. 31, 2011 Total cost of products sold (exclusive of depreciation and amortization) Supplier concentration Petroleum supplier	Dec. 31, 2010 Total cost of products sold (exclusive of depreciation and amortization) Supplier concentration Petroleum supplier	Dec. 31, 2011 Total cost of products sold (exclusive of depreciation and amortization) Supplier concentration Petroleum Supplier A	Dec. 31, 2010 Total cost of products sold (exclusive of depreciation and amortization) Supplier concentration Petroleum Supplier A	Dec. 31, 2009 Total cost of products sold (exclusive of depreciation and amortization) Supplier concentration Petroleum Supplier A	Dec. 31, 2011 Direct operating expenses (exclusive of depreciation and amortization) Supplier concentration Nitrogen Fertilizer supplier	Dec. 31, 2011 Direct operating expenses (exclusive of depreciation and amortization) Supplier concentration Nitrogen Fertilizer supplier B	Dec. 31, 2010 Direct operating expenses (exclusive of depreciation and amortization) Supplier concentration Nitrogen Fertilizer supplier B	Dec. 31, 2009 Direct operating expenses (exclusive of depreciation and amortization) Supplier concentration Nitrogen Fertilizer supplier B
Major Customers and Suppliers
Concentration risk (as a percent)	36.00%	35.00%	35.00%	15.00%	14.00%	14.00%	12.00%	11.00%	10.00%	9.00%	10.00%	11.00%	29.00%	22.00%	24.00%	17.00%	12.00%	15.00%	12.00%	10.00%	9.00%			65.00%	64.00%	69.00%		5.00%	5.00%	5.00%
Number of major suppliers																						1	1				1

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Represents the number of major suppliers.

+ References

No definition available.

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- 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

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