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Asset Retirement Obligations (Tables)
 3 Months Ended
Mar. 31, 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 three months ended March 31, (in thousands): 
 
 
2018
 
2017
Beginning asset retirement obligations
 
$
2,354

 
$
6,013

Liabilities incurred
 
1

 
1

Liabilities settled
 
(52
)
 
—

Accretion expense
 
41

 
152

Divestitures
 
(385
)
 
—

Revision of estimates
 
(182
)
 
20

Ending asset retirement obligations
 
$
1,777

 
$
6,186