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Utility Plant and Intangible Assets - ARO Rollforward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of the beginning and ending aggregate carrying amount of the asset retirement obligations    
Obligation at the beginning of the period $ 10,103 $ 9,717
Accretion 406 386
Obligation at the end of the period $ 10,509 $ 10,103