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Major Customers and Suppliers (Tables)
 12 Months Ended
Dec. 31, 2013
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,
 
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
%
Petroleum | Supplier concentration
  
Major Customers and Suppliers  
Schedule of purchases contracted as a percentage of the total cost of product sold (exclusive of depreciation and amortization)
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
%
Nitrogen Fertilizer | Supplier concentration
  
Major Customers and Suppliers  
Schedule of purchases contracted as a percentage of the total cost of product sold (exclusive of depreciation and amortization)
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
%