Major Customers and Suppliers

12 Months Ended

Dec. 31, 2013

(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,
	2013		2012		2011
Petroleum
Customer A	12	%	10	%	15	%
Customer B	9	%	9	%	12	%
	21	%	19	%	27	%
Nitrogen Fertilizer
Customer C	15	%	10	%	17	%
Customer D	13	%	10	%	12	%
	28	%	20	%	29	%

The petroleum segment obtained crude oil from one supplier under a long-term supply agreement during 2013, 2012 and 2011. 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,
	2013		2012		2011
Petroleum
Supplier A	69	%	45	%	65	%

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,
	2013		2012		2011
Nitrogen Fertilizer
Supplier B	4	%	5	%	5	%