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Major Customers and Suppliers (Details) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Sales | Customer concentration | Petroleum |  |  |
Major Customers and Suppliers |  |  |
Concentration risk (as a percent) | 21.00% | 19.00% | 27.00%
Sales | Customer concentration | Petroleum | Customer A |  |  |
Major Customers and Suppliers |  |  |
Concentration risk (as a percent) | 12.00% | 10.00% | 15.00%
Sales | Customer concentration | Petroleum | Customer B |  |  |
Major Customers and Suppliers |  |  |
Concentration risk (as a percent) | 9.00% | 9.00% | 12.00%
Sales | Customer concentration | Nitrogen Fertilizer |  |  |
Major Customers and Suppliers |  |  |
Concentration risk (as a percent) | 28.00% | 20.00% | 29.00%
Sales | Customer concentration | Nitrogen Fertilizer | Customer C |  |  |
Major Customers and Suppliers |  |  |
Concentration risk (as a percent) | 15.00% | 10.00% | 17.00%
Sales | Customer concentration | Nitrogen Fertilizer | Customer D |  |  |
Major Customers and Suppliers |  |  |
Concentration risk (as a percent) | 13.00% | 10.00% | 12.00%
Contracted volume | Supplier concentration | Petroleum |  |  |
Major Customers and Suppliers |  |  |
Number of major suppliers | 1 | 1 | 1
Contracted volume | Supplier concentration | Petroleum | Supplier A |  |  |
Major Customers and Suppliers |  |  |
Concentration risk (as a percent) | 69.00% | 45.00% | 65.00%
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) | 4.00% | 5.00% | 5.00%

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- Definition Represents the number of major suppliers. + References No definition available. + Details
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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 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 Reference 2: 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 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=28364263&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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