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Business Description And Significant Accounting Policies: Goodwill (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Line Items]    
Goodwill $ 1,299,454 $ 1,299,454
Electric Utilities    
Goodwill [Line Items]    
Goodwill 248,479  
Gas Utilities    
Goodwill [Line Items]    
Goodwill 1,042,210  
Power Generation    
Goodwill [Line Items]    
Goodwill $ 8,765