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Business Segment Information: Segment Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting, Asset Reconciling Item    
Total Assets $ 9,131,896 $ 8,088,786
Corporate, Non-Segment    
Segment Reporting, Asset Reconciling Item    
Total Assets 88,864 110,349
Electric Utilities    
Segment Reporting, Asset Reconciling Item    
Total Assets 3,796,662 3,602,233
Gas Utilities    
Segment Reporting, Asset Reconciling Item    
Total Assets $ 5,246,370 $ 4,376,204