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Business Segment Information: Segment Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting, Asset Reconciling Item
Total Assets	$ 8,088,786	$ 7,558,457
Corporate, Non-Segment
Segment Reporting, Asset Reconciling Item
Total Assets	110,349	130,245
Electric Utilities
Segment Reporting, Asset Reconciling Item
Total Assets	3,120,928	2,900,983
Gas Utilities
Segment Reporting, Asset Reconciling Item
Total Assets	4,376,204	4,032,339
Power Generation
Segment Reporting, Asset Reconciling Item
Total Assets	404,220	417,715
Mining
Segment Reporting, Asset Reconciling Item
Total Assets	$ 77,085	$ 77,175

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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