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Balance Sheet Components - Net Utility Property (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]    
Utility plant in service $ 6,865,652 $ 6,809,797
Construction work in progress 193,685 175,767
Total 7,059,337 6,985,564
Less: Accumulated depreciation and amortization 2,032,234 1,993,952
Total net utility property $ 5,027,103 $ 4,991,612