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Balance Sheet Components - Net Utility Property (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Balance Sheet Related Disclosures [Abstract] |  |
Utility plant in service | $ 6,677,671 | $ 6,462,993
Construction work in progress | 209,098 | 164,941
Total | 6,886,769 | 6,627,934
Less: Accumulated depreciation and amortization | 1,956,410 | 1,830,927
Total net utility property | $ 4,930,359 | $ 4,797,007

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