|**Concentration of Risk (Tables)**                 | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
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|**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 SalesPercentage of Total Oil, Gas & NGL SalesYear Ended December 31, 2014Glencore Energy UK Ltd32%22%Shell(1)15%10%Year Ended December 31, 2013Glencore Energy UK Ltd34%25%Shell(1)17%13%Year Ended December 31, 2012Glencore Energy UK Ltd39%31%Shell(1)17%14%(1)Includes sales to both Shell Trading (US) Company and Shell International Trading and Shipping Limited.
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|Year Ended December 31, 2014                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Glencore Energy UK Ltd                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Shell(1)                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Year Ended December 31, 2013                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Glencore Energy UK Ltd                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Shell(1)                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Year Ended December 31, 2012                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Glencore Energy UK Ltd                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Shell(1)                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 

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