Major Customers and Suppliers

12 Months Ended

Dec. 31, 2012

(20) Major Customers and Suppliers

Sales to major customers were as follows:

	Year Ended December 31,

	2012			2011			2010
Petroleum
Customer A		10	%		15	%		14	%
Customer B		9	%		12	%		11	%
Customer C		8	%		9	%		10	%

		27	%		36	%		35	%

Nitrogen Fertilizer
Customer D		10	%		17	%		12	%
Customer E		10	%		12	%		10	%

		20	%		29	%		22	%

The Petroleum Segment obtained crude oil from one supplier under a long-term supply agreement during 2012, 2011 and 2010. The crude oil purchased from this supplier is governed by a long-term contract. Purchases contracted as a percentage of the total cost of product sold (exclusive of depreciation and amortization) for each of the periods were as follows:

	Year Ended December 31,

	2012			2011			2010
Petroleum
Supplier A		45	%		65	%		64	%

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,

	2012			2011			2010
Nitrogen Fertilizer
Supplier B		5	%		5	%		5	%