Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2019

Asset Retirement Obligation Disclosure [Abstract]

Reconciliation of Asset Retirement Obligations which are Included in Other Liabilities

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