Asset Retirement Obligations

12 Months Ended

Dec. 31, 2021

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligations

The following table reconciles our AROs as of the dates presented, which are included within Other liabilities on our consolidated balance sheets: 

	Year Ended December 31,
	2021		2020
Balance at beginning of period	$	5,461	$	4,934
Changes in estimates	—		33
Liabilities incurred	226		121
Liabilities settled	(228)		—
Acquisitions of properties	2,508		16
Accretion expense	446		357
Balance at end of period	$	8,413	$	5,461