Annual report pursuant to Section 13 and 15(d)

Asset Retirement Obligations (Tables)

v3.20.4
Asset Retirement Obligations (Tables)
12 Months Ended
Dec. 31, 2020
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,
  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