Concentration of Risk (Tables)

12 Months Ended

Dec. 31, 2012

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, 2012
Glencore Energy UK Ltd	39	%	31	%
Shell ⁽¹⁾	17	%	14	%
Year Ended December 31, 2011
Glencore Energy UK Ltd	24	%	16	%
Shell ⁽¹⁾	17	%	12	%
Year Ended December 31, 2010
Glencore Energy UK Ltd	17	%	11	%

⁽¹⁾ Includes sales to both Shell Trading (US) Company and Shell International Trading and Shipping Limited.

Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark.