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Commitments And Contingencies: Reimbursement Agreement (Details) - Electric Utilities - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term debt $ 544,855 $ 544,855
Industrial Development Revenue Bonds Due 2027    
Debt Instrument [Line Items]    
Long-term debt $ 10,000 10,000
Long-term Debt, Maturity Date Mar. 01, 2027  
Industrial Development Revenue Bonds Due 2021    
Debt Instrument [Line Items]    
Long-term debt $ 7,000 $ 7,000
Long-term Debt, Maturity Date Sep. 01, 2021