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Asset Retirement Obligations (Tables)
 3 Months Ended
Mar. 31, 2019
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): 
 
 
2019
 
2018
Beginning asset retirement obligations
 
$
2,229

 
$
2,354

Liabilities incurred
 
21

 
1

Liabilities settled
 
(62
)
 
(52
)
Accretion expense
 
54

 
41

Divestitures
 
—

 
(385
)
Revision of estimates
 
—

 
(182
)
Ending asset retirement obligations
 
$
2,242

 
$
1,777