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Asset Retirement Obligations (Tables)
 9 Months Ended
Sep. 30, 2012
Asset Retirement Obligations [Abstract]  
Schedule Of Change In Asset Retirement Obligation

 

 

 

 

 

 

 

 

 

 

 

Nine Months Ended

 

 

 

September 30, 2012

Beginning of period

 

$
65,701 

Assumed in acquisition

 

 
4,738 

Divested

 

 
(23)

Revisions to previous estimates

 

 
2,928 

Liabilities incurred

 

 
1,208 

Liabilities settled

 

 
(2,845)

Accretion expense

 

 
2,645 

End of period

 

$
74,352 

Less: Current portion of asset retirement obligations

 

 
(845)

Asset retirement obligations - non-current

 

$
73,507