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Major Customers and Suppliers | 12 Months Ended
--- | ---
Dec. 31, 2012
Major Customers and Suppliers |
Major Customers and Suppliers | (20) Major Customers and Suppliers Sales to major customers were as follows:
|  | Year Ended December 31, |
--- | --- | --- | ---
|  | 2012 |  | 2011 |  | 2010 |
Petroleum |  |  |  |  |  |  |  |  |  |
Customer A |  |  | 10 | % |  | 15 | % |  | 14 | %
Customer B |  |  | 9 | % |  | 12 | % |  | 11 | %
Customer C |  |  | 8 | % |  | 9 | % |  | 10 | %
|  |  | 27 | % |  | 36 | % |  | 35 | %
Nitrogen Fertilizer |  |  |  |  |  |  |  |  |  |
Customer D |  |  | 10 | % |  | 17 | % |  | 12 | %
Customer E |  |  | 10 | % |  | 12 | % |  | 10 | %
|  |  | 20 | % |  | 29 | % |  | 22 | %
The Petroleum Segment obtained crude oil from one supplier under a long-term supply agreement during 2012, 2011 and 2010. The crude oil purchased from this supplier is governed by a long-term contract. Purchases contracted as a percentage of the total cost of product sold (exclusive of depreciation and amortization) for each of the periods were as follows:
|  | Year Ended December 31, |
--- | --- | --- | ---
|  | 2012 |  | 2011 |  | 2010 |
Petroleum |  |  |  |  |  |  |  |  |  |
Supplier A |  |  | 45 | % |  | 65 | % |  | 64 | %
The Nitrogen Fertilizer Segment maintains long-term contracts with one supplier. Purchases from this supplier as a percentage of direct operating expenses (exclusive of depreciation and amortization) were as follows:
|  | Year Ended December 31, |
--- | --- | --- | ---
|  | 2012 |  | 2011 |  | 2010 |
Nitrogen Fertilizer |  |  |  |  |  |  |  |  |  |
Supplier B |  |  | 5 | % |  | 5 | % |  | 5 | %

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- Definition Represents entire disclosure of the percentage of revenues from each major customer and percentage of cost of good sold from each major supplier. + References No definition available. + Details
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