Concentration of Risk (Tables)

12 Months Ended

Dec. 31, 2017

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, 2017
BP (1)	15	%	10	%
Shell (2)	22	%	13	%
Year Ended December 31, 2016
Glencore Energy UK Ltd	22	%	12	%
Shell (2)	24	%	13	%
Year Ended December 31, 2015
Glencore Energy UK Ltd	30	%	18	%
Shell (2)	18	%	11	%

⁽¹⁾ Includes sales to BP North American Funding Company, BP Company Commercial and/or BP Company.

⁽²⁾ Includes sales to Shell Trading (US) Company and/or Shell International Trading and Shipping Limited.