|**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, 2017BP(1)15%10%Shell(2)22%13%Year Ended December 31, 2016Glencore Energy UK Ltd22%12%Shell(2)24%13%Year Ended December 31, 2015Glencore Energy UK Ltd30%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.
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|Year Ended December 31, 2017                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|BP(1)                                              |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Shell(2)                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Year Ended December 31, 2016                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Glencore Energy UK Ltd                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Shell(2)                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Year Ended December 31, 2015                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Glencore Energy UK Ltd                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Shell(2)                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              

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