XML 71 R60.htm IDEA: XBRL DOCUMENT v3.22.1
Asset Retirement Obligations (Summary of Changes in Asset Retirement Obligations) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Asset Retirement Obligations [Abstract]    
Beginning balance $ 40,694 $ 17,334
Accretion 473 1,627
Additions   14,564
Revisions   7,169
Ending balance $ 41,167 $ 40,694