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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, (in thousands): 
 
 
2018
 
2017
Beginning asset retirement obligations
 
$
2,354

 
$
6,013

Liabilities incurred
 
42

 
2

Liabilities settled
 
(79
)
 
—

Acquisitions
 
—

 
359

Accretion expense
 
84

 
306

Divestitures
 
(385
)
 
(7
)
Revision of estimates
 
(182
)
 
19

Ending asset retirement obligations
 
$
1,834

 
$
6,692