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Asset Retirement Obligations
 3 Months Ended
Mar. 31, 2017
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
Asset Retirement Obligations

The following table is a reconciliation of the ARO liability as of and for the three months ended March 31, 2017 and the twelve months ended December 31, 2016.
 
 
March 31,
2017
 
December 31, 2016
Asset retirement obligation at beginning of period
$
83,991

 
$
109,171

Liabilities incurred on properties acquired and developed
—

 
—

Revisions to previous estimates
7,570

 
—

Liabilities on properties sold or settled
—

 
(27,850
)
Accretion expense
1,208

 
2,670

Asset retirement obligation at end of period
$
92,769

 
$
83,991