XML 88 R64.htm IDEA: XBRL DOCUMENT v3.22.0.1
Asset Retirement Obligation - Schedule of Changes in Carrying Amount of Asset Retirement Obligation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Asset Retirement Obligation, Roll Forward Analysis    
Balance, beginning of year $ 48,214 $ 43,419
Liability incurred 4,122 909
Settlements (805) (201)
Accretion 4,180 3,464
Revisions in estimated liability (1,186) 623
Balance, end of year $ 54,525 $ 48,214