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Asset Retirement Obligations (Tables)
 9 Months Ended
Sep. 30, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Summary of Asset Retirement Obligation Transactions
The following table summarizes the Company’s asset retirement obligation transactions recorded during the nine months ended September 30, (in thousands): 
 
 
2018
 
2017
Beginning asset retirement obligations
 
$
2,354

 
$
6,013

Liabilities incurred
 
63

 
64

Liabilities settled
 
(79
)
 
—

Acquisitions
 
—

 
359

Accretion expense
 
128

 
378

Divestitures
 
(649
)
 
(3,629
)
Revision of estimates
 
(182
)
 
19

Ending asset retirement obligations
 
$
1,635

 
$
3,204