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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2012
Asset Retirement Obligation [Abstract]  
Asset Retirement Obligations
         
    Six Months
Ended
June  30,
2012		  
   

Beginning of period

   $ 84,810  

Liabilities incurred

     4,009  

Liabilities settled

     (2,142 ) 

Disposition of wells

     (151 ) 

Accretion expense

     3,668  

Change in estimate

     (5 ) 
   

 

 

  

End of period

     90,189  
   

Less current portion

     (5,005 ) 
   

 

 

  
   

Long-term asset retirement obligations

   $ 85,184