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Major Customers and Suppliers (Details) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  | 12 Months Ended |  |  |
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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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- 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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