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Major Customers and Suppliers
12 Months Ended
Dec. 31, 2013
Risks and Uncertainties [Abstract]  
Major Customers and Suppliers
(16) Major Customers and Suppliers
Sales of nitrogen fertilizer to major customers were as follows:
 
December 31,
 
2013
 
2012
 
2011
Nitrogen Fertilizer
 
 
 
 
 
Customer A
15
%
 
10
%
 
17
%
Customer B
13
%
 
10
%
 
12
%
 
28
%
 
20
%
 
29
%

In addition to contracts with CVR Energy and its affiliates. See Note 14 ("Related Party Transactions"). The Partnership 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:
 
December 31,
 
2013
 
2012
 
2011
Supplier A
4
%
 
5
%
 
5
%