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Major Customers and Suppliers (Tables) | 12 Months Ended
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Dec. 31, 2014
Major Customers and Suppliers |
Schedule of sales to major customers | 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 | %
Petroleum | Supplier concentration |
Major Customers and Suppliers |
Schedule of purchases contracted as a percentage of the total cost of product sold (exclusive of depreciation and amortization) | 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 | %
Nitrogen Fertilizer | Supplier concentration |
Major Customers and Suppliers |
Schedule of purchases contracted as a percentage of the total cost of product sold (exclusive of depreciation and amortization) | 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 Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. + References No definition available. + Details
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- Definition Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6327-108592 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=35750535&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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6442-108592 + Details
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