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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

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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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