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Utility Plant and Intangible Assets 3 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of the beginning and ending aggregate carrying amount of the asset retirement obligations    
Obligation at the beginning of the period $ 9,320 $ 8,863
Additional liabilities incurred 148 165
Liabilities settled (120) (58)
Accretion 369 350
Obligation at the end of the period $ 9,717 $ 9,320