Annual report pursuant to Section 13 and 15(d)

Asset Retirement Obligations

v3.20.4
Asset Retirement Obligations
12 Months Ended
Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations Asset Retirement ObligationsThe 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,
  2020 2019
Balance at beginning of period $ 4,934  $ 4,314 
Changes in estimates 33  (2)
Liabilities incurred 121  290 
Liabilities settled —  (67)
Acquisitions of properties 16  83 
Accretion expense 357  316 
Balance at end of period $ 5,461  $ 4,934