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Major Customers and Suppliers

12 Months Ended

Dec. 31, 2011

(22) Major Customers and Suppliers

Sales to major customers were as follows:

	Year Ended December 31,

	2011			2010			2009
Petroleum
Customer A		15	%		14	%		14	%
Customer B		12	%		11	%		10	%
Customer C		9	%		10	%		11	%

		36	%		35	%		35	%

Nitrogen Fertilizer
Customer D		17	%		12	%		15	%
Customer E		12	%		10	%		9	%

		29	%		22	%		24	%

In connection with an agreement entered into on December 31, 2008, the Petroleum Segment obtained crude oil from one supplier for 2009, 2010 and 2011. 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,

	2011			2010			2009
Petroleum
Supplier A		65	%		64	%		69	%

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,

	2011			2010			2009
Nitrogen Fertilizer
Supplier B		5	%		5	%		5	%