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Major Customers and Suppliers | 12 Months Ended
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Dec. 31, 2014
Major Customers and Suppliers |
Major Customers and Suppliers | (19) Major Customers and Suppliers Sales to major customers as a percentage of the respective segment's sales were as follows:
| Year Ended December 31,
| 2014 |  | 2013 |  | 2012
Petroleum |  |  |  |  |
Customer A | 13 | % |  | 12 | % |  | 10 | %
Nitrogen Fertilizer |  |  |  |  |
Customer B | 17 | % |  | 15 | % |  | 10 | %
Customer C | 10 | % |  | 13 | % |  | 10 | %
| 27 | % |  | 28 | % |  | 20 | %
The petroleum segment obtained crude oil from one third-party supplier under a long-term supply agreement during 2014, 2013 and 2012. The crude oil purchased from this supplier is governed by a long-term contract. Volume contracted as a percentage of the total crude oil purchases (in barrels) for each of the periods was as follows:
| Year Ended December 31,
| 2014 |  | 2013 |  | 2012
Petroleum |  |  |  |  |
Supplier A | 67 | % |  | 69 | % |  | 45 | %
The nitrogen fertilizer segment maintains long-term contracts with one third-party supplier. Purchases from this supplier as a percentage of direct operating expenses (exclusive of depreciation and amortization) were as follows:
| Year Ended December 31,
| 2014 |  | 2013 |  | 2012
Nitrogen Fertilizer |  |  |  |  |
Supplier B | 4 | % |  | 4 | % |  | 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 or purchase volume from each major supplier. + References No definition available. + Details
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