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Balance Sheet Components - Other Property and Investments-Net and Other Non-current Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Balance Sheet Related Disclosures [Abstract] |  |  |
Operating lease ROU assets | $ 70,578 |  | $ 71,891
Equity investments | 83,496 |  | 59,318
Finance lease ROU assets | 44,607 |  | 47,338
Non-utility property | 19,248 |  | 19,508
Notes receivable | 14,759 |  | 14,454
Investment in affiliated trust | 11,547 |  | 11,547
Deferred compensation assets | 9,917 |  | 9,174
Assets held for sale | 0 | [1] | 3,462
Other | 23,848 |  | 26,947
Total | $ 278,000 |  | $ 263,639
[1] | During the second quarter of 2021, the Company sold certain subsidiary assets associated with the Spokane Steam Plant.

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