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Disclosure - Fair Value of Financial Instruments (Details) link:presentationLink link:calculationLink link:definitionLink 2317301 - Disclosure - Fair Value of Financial Instruments (Tables) link:presentationLink link:calculationLink link:definitionLink 2124100 - Disclosure - Income Taxes: link:presentationLink link:calculationLink link:definitionLink 2424402 - Disclosure - Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 2324301 - Disclosure - Income Taxes (Tables) link:presentationLink link:calculationLink link:definitionLink 2424403 - Disclosure - Income Taxes: Tax Benefit Related to Legal Restructuring (Details) link:presentationLink link:calculationLink link:definitionLink 2424404 - Disclosure - Income Taxes: TCJA (Details) link:presentationLink link:calculationLink link:definitionLink 2109100 - Disclosure - Investments: link:presentationLink link:calculationLink link:definitionLink 2409402 - Disclosure - Investments (Details) link:presentationLink link:calculationLink link:definitionLink 2309301 - 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Disclosure - Notes Payable, Current Maturities and Debt: Debt Covenants (Details) link:presentationLink link:calculationLink link:definitionLink 2412405 - Disclosure - Notes Payable, Current Maturities and Debt: Long-Term Debt (Details) link:presentationLink link:calculationLink link:definitionLink 2412402 - Disclosure - Notes Payable, Current Maturities and Debt: Schedule of Short-term Debt and Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2312301 - Disclosure - Notes Payable, Current Maturities and Debt (Tables) link:presentationLink link:calculationLink link:definitionLink 2119100 - Disclosure - Other Comprehensive Income (Loss): link:presentationLink link:calculationLink link:definitionLink 2419403 - Disclosure - Other Comprehensive Income (Loss): Accumulated Other Comprehensive Income (Details) link:presentationLink link:calculationLink link:definitionLink 2419402 - Disclosure - Other Comprehensive Income (Loss): Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) link:presentationLink link:calculationLink link:definitionLink 2319301 - 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Disclosure - Risk Management Activities: Utilities (Details) link:presentationLink link:calculationLink link:definitionLink 2127100 - Disclosure - Subsequent Events: link:presentationLink link:calculationLink link:definitionLink 2120100 - Disclosure - Supplemental Disclosure of Cash Flow Information: link:presentationLink link:calculationLink link:definitionLink 2420402 - Disclosure - Supplemental Disclosure of Cash Flow Information (Details) link:presentationLink link:calculationLink link:definitionLink 2320301 - Disclosure - Supplemental Disclosure of Cash Flow Information (Tables) link:presentationLink link:calculationLink link:definitionLink