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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
Asset Retirement Obligations
The following table reconciles our AROs as of the dates presented, which are included in the “Other liabilities” caption on our Consolidated Balance Sheets: 
 
Year Ended December 31,
 
2019
 
2018
Balance at beginning of period
$
4,314

 
$
3,286

Changes in estimates
(2
)
 
354

Liabilities incurred
290

 
335

Liabilities settled
(67
)
 
(8
)
Acquisitions of properties
83

 
385

Sale of properties
—

 
(310
)
Accretion expense
316

 
272

Balance at end of period
$
4,934

 
$
4,314