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Business Description And Significant Accounting Policies: Accounts Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts Receivable [Line Items]        
Allowance for credit losses $ (7,003) $ (2,444) $ (3,209) $ (3,081)
Accounts receivable, net 265,961 255,805    
Corporate, Non-Segment        
Accounts Receivable [Line Items]        
Allowance for credit losses 0 (169)    
Accounts receivable, net 1,118 1,102    
Electric Utilities        
Accounts Receivable [Line Items]        
Allowance for credit losses (1,269) (592)    
Accounts receivable, net 77,487 74,722    
Gas Utilities        
Accounts Receivable [Line Items]        
Allowance for credit losses (5,734) (1,683)    
Accounts receivable, net 183,008 175,540    
Power Generation        
Accounts Receivable [Line Items]        
Allowance for credit losses 0 0    
Accounts receivable, net 1,837 2,164    
Mining        
Accounts Receivable [Line Items]        
Allowance for credit losses 0 0    
Accounts receivable, net 2,511 2,277    
Billed Revenues        
Accounts Receivable [Line Items]        
Accounts Receivable, Trade 146,899 144,747    
Billed Revenues | Corporate, Non-Segment        
Accounts Receivable [Line Items]        
Accounts Receivable, Trade 1,118 1,271    
Billed Revenues | Electric Utilities        
Accounts Receivable [Line Items]        
Accounts Receivable, Trade 45,841 41,428    
Billed Revenues | Gas Utilities        
Accounts Receivable [Line Items]        
Accounts Receivable, Trade 95,592 97,607    
Billed Revenues | Power Generation        
Accounts Receivable [Line Items]        
Accounts Receivable, Trade 1,837 2,164    
Billed Revenues | Mining        
Accounts Receivable [Line Items]        
Accounts Receivable, Trade 2,511 2,277    
Unbilled Revenues        
Accounts Receivable [Line Items]        
Accounts Receivable, Trade 126,065 113,502    
Unbilled Revenues | Corporate, Non-Segment        
Accounts Receivable [Line Items]        
Accounts Receivable, Trade 0 0    
Unbilled Revenues | Electric Utilities        
Accounts Receivable [Line Items]        
Accounts Receivable, Trade 32,915 33,886    
Unbilled Revenues | Gas Utilities        
Accounts Receivable [Line Items]        
Accounts Receivable, Trade 93,150 79,616    
Unbilled Revenues | Power Generation        
Accounts Receivable [Line Items]        
Accounts Receivable, Trade 0 0    
Unbilled Revenues | Mining        
Accounts Receivable [Line Items]        
Accounts Receivable, Trade $ 0 $ 0