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Business Segment Information: Segment and Corporate Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 9,322,294 $ 9,131,896
Corporate and Other    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 102,489 88,864
Electric Utilities    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 3,889,596 3,796,662
Gas Utilities    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 5,330,209 $ 5,246,370