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Asset Retirement Obligation (Tables)
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Asset Retirement Obligation Disclosure [Abstract]    
Reconciliation of the ARO Liability
The following table is a reconciliation of the ARO liability as of and for the nine months ended September 30, 2017 and the twelve months ended December 31, 2016.
 
 
September 30,
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
7,486

 
—

Liabilities on properties sold or settled
—

 
(27,850
)
Accretion expense
1,632

 
2,670

Asset retirement obligation at end of period
$
93,109

 
$
83,991

The following table is a reconciliation of the ARO liability as of and for the nine months ended September 30, 2017 and the twelve months ended December 31, 2016.
 
 
September 30,
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
7,486

 
—

Liabilities on properties sold or settled
—

 
(27,850
)
Accretion expense
1,632

 
2,670

Asset retirement obligation at end of period
$
93,109

 
$
83,991
The following table is a reconciliation of the ARO liability for the twelve months ended December 31, 2016 and 2015.
 
 
Years Ended December 31,
 
2016
 
2015
Asset retirement obligation at beginning of period
$
109,171

 
$
44,214

Liabilities incurred
—

 
2,506

Revisions to previous estimates and sales of properties
—

 
60,832

Liabilities on properties sold or settled
(27,850
)
 
(3,721
)
Accretion expense
2,670

 
$
5,340

Asset retirement obligation at end of period
$
83,991

 
$
109,171