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Asset Retirement Obligations
 9 Months Ended
Sep. 30, 2014
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
Asset Retirement Obligations

The following table is a reconciliation of the ARO liability for continuing operations for the nine months ended September 30, 2014 and the twelve months ended December 31, 2013.
 
 
September 30,
2014
 
December 31, 2013
Asset retirement obligation at beginning of period
$
51,954

 
$
39,905

Liabilities incurred on properties acquired and developed
17,069

 
8,930

Revisions to previous estimates
(11,990
)
 
—

Liabilities on properties sold (Lightnin' properties)
(17,602
)
 
—

Accretion expense
2,686

 
3,119

Asset retirement obligation at end of period
$
42,117

 
$
51,954