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Financing: Schedule of Short-term Debt and Narrative (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Short-term Debt [Line Items]    
Notes payable $ 341,480 $ 420,180
Letters of Credit 16,855 27,209
Commercial Paper    
Short-term Debt [Line Items]    
Notes payable 341,480 420,180
Letters of Credit 0 0
Revolving Credit Facility    
Short-term Debt [Line Items]    
Notes payable 0 0
Letters of Credit $ 16,855 $ 27,209