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Concentration of Risk (Tables)
12 Months Ended
Dec. 31, 2014
Concentration of Risk [Abstract]  
Schedules of Concentration of Risk, by Risk Factor
The largest single non-affiliated purchasers of our production were as follows:
 
 
Percentage of Crude Oil Sales
 
Percentage of Total Oil, Gas & NGL Sales
Year Ended December 31, 2014
 
 
 
 
Glencore Energy UK Ltd
 
32
%
 
22
%
Shell (1)
 
15
%
 
10
%
Year Ended December 31, 2013
 
 

 
 

Glencore Energy UK Ltd
 
34
%
 
25
%
Shell (1)
 
17
%
 
13
%
Year Ended December 31, 2012
 
 

 
 

Glencore Energy UK Ltd
 
39
%
 
31
%
Shell (1)
 
17
%
 
14
%
(1) Includes sales to both Shell Trading (US) Company and Shell International Trading and Shipping Limited.