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Balance Sheet Components - Other Property and Investments-Net and Other Non-current Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Balance Sheet Related Disclosures [Abstract] |  |
Operating lease ROU assets | $ 72,588 | $ 69,746
Finance lease ROU assets | 49,159 | 50,980
Non-utility property | 26,774 | 27,159
Equity investments | 51,748 | 51,258
Investment in affiliated trust | 11,547 | 11,547
Notes receivable | 16,375 | 14,060
Deferred compensation assets | 8,435 | 8,948
Other | 25,842 | 23,394
Total | $ 262,468 | $ 257,092

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