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Business Segment Information: Segment and Corporate Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | $ 8,696,199 | $ 8,088,786
Corporate |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | 94,947 | 110,349
Electric Utilities |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | 3,217,474 | 3,120,928
Gas Utilities |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | 4,900,939 | 4,376,204
Power Generation |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | 406,742 | 404,220
Mining |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | $ 76,097 | $ 77,085

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