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Balance Sheet Components Net Utility Property (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Balance Sheet Related Disclosures [Abstract] |  |
Utility plant in service | $ 6,262,789 | $ 6,209,968
Construction work in progress | 191,845 | 160,598
Total | 6,454,634 | 6,370,566
Less: Accumulated depreciation and amortization | 1,769,980 | 1,721,636
Total net utility property | $ 4,684,654 | $ 4,648,930

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