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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 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 years ended December 31, 2019 and 2018 (in thousands):
 
2019
 
2018
Beginning asset retirement obligations
$
2,229

 
$
2,354

Liabilities acquired (1)
—

 
298

Liabilities incurred
105

 
102

Property dispositions (1)
(10
)
 
(766
)
Liabilities settled
(374
)
 
(79
)
Accretion expense
214

 
169

Revision of estimates
—

 
151

Ending asset retirement obligations
$
2,164

 
$
2,229

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