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Major Customers and Suppliers (Tables)

12 Months Ended

Dec. 31, 2017

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,
	2017			2016			2015
Petroleum
Customer A	19	%		15	%		14	%
Nitrogen Fertilizer
Customer B	5	%		10	%		10	%
Customer C	11	%		10	%		14	%
	16	%		20	%		24	%

Schedule of purchases contracted as a percentage of total crude oil purchases (in barrels)

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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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.

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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.

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-Publisher FASB
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