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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 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 years ended December 31, 2018 and 2017 (in thousands):
 
 
2018
 
2017
Beginning asset retirement obligations
$
2,354

 
$
6,013

Liabilities acquired (1)
298

 
359

Liabilities incurred
102

 
77

Property dispositions (1)
(766
)
 
(4,401
)
Liabilities settled
(79
)
 
(9
)
Accretion expense
169

 
434

Revision of estimates
151

 
(119
)
Ending asset retirement obligations
$
2,229

 
$
2,354

(1)
See Note 3. Acquisitions and Divestitures for additional information on the Company's acquisition and property disposition activities.