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General - Utility Plant Depreciation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
General and Administrative Expense        
Public Utility, Property, Plant and Equipment [Line Items]        
Depreciation $ 120 $ 370 $ 1,456 $ 1,469