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Major Customers and Suppliers | 12 Months Ended
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Dec. 31, 2017
Major Customers and Suppliers |
Major Customers and Suppliers | (20) Major Customers and Suppliers Sales to major customers as a percentage of the respective segment's sales were as follows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Petroleum |  |  |  |  |
Customer A | 19 | % |  | 15 | % |  | 14 | %
Nitrogen Fertilizer |  |  |  |  |
Customer B | 5 | % |  | 10 | % |  | 10 | %
Customer C | 11 | % |  | 10 | % |  | 14 | %
| 16 | % |  | 20 | % |  | 24 | %
The petroleum segment obtained crude oil from one third-party supplier under a long-term supply agreement during 2017, 2016 and 2015. 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,
| 2017 |  | 2016 |  | 2015
Petroleum |  |  |  |  |
Supplier A | 55 | % |  | 61 | % |  | 61 | %

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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
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Namespace Prefix: | cvi_
Data Type: | xbrli:stringItemType
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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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Namespace Prefix: | cvi_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration