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Statement - Condensed Consolidated Statements of Cash Flows (unaudited) link:presentationLink link:calculationLink link:definitionLink 1003000 - Statement - Condensed Consolidated Statements of Comprehensive Income (unaudited) link:presentationLink link:calculationLink link:definitionLink 1003001 - Statement - Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 1006000 - Statement - Condensed Consolidated Statements Of Equity (unaudited) link:presentationLink link:calculationLink link:definitionLink 1006001 - Statement - Condensed Consolidated Statements Of Equity (unaudited) Condensed Consolidated Statements of Equity (unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 1002000 - Statement - Condensed Consolidated Statements of Income (unaudited) link:presentationLink link:calculationLink link:definitionLink 1002000 - Statement - Condensed Consolidated Statements of Income (unaudited) link:presentationLink link:calculationLink link:definitionLink 2405402 - Disclosure - Disaggregation of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 2124100 - Disclosure - Discontinued Operations: link:presentationLink link:calculationLink link:definitionLink 0001000 - Document - Document and Entity Information Document link:presentationLink link:calculationLink link:definitionLink 2112100 - Disclosure - Earnings Per Share: link:presentationLink link:calculationLink link:definitionLink 2412403 - Disclosure - Earnings Per Share: Anti-dilutive shares (Details) link:presentationLink link:calculationLink link:definitionLink 2412402 - Disclosure - Earnings Per Share: Earnings Per Share Reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 2312301 - Disclosure - Earnings Per Share (Tables) link:presentationLink link:calculationLink link:definitionLink 2122100 - Disclosure - Employee Benefit Plans: link:presentationLink link:calculationLink link:definitionLink 2422402 - Disclosure - Employee Benefit Plans (Details) link:presentationLink link:calculationLink link:definitionLink 2322301 - 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Notes Payable, Current Maturities and Debt: Long-Term Debt (Details) link:presentationLink link:calculationLink link:definitionLink 2414402 - Disclosure - Notes Payable, Current Maturities and Debt: Schedule of Short-term Debt and Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2414405 - Disclosure - Notes Payable, Current Maturities and Debt: Subsequent Event - Debt Offering (Details) link:presentationLink link:calculationLink link:definitionLink 2314301 - Disclosure - Notes Payable, Current Maturities and Debt (Tables) link:presentationLink link:calculationLink link:definitionLink 2120100 - Disclosure - Other Comprehensive Income (Loss): link:presentationLink link:calculationLink link:definitionLink 2420403 - Disclosure - Other Comprehensive Income (Loss): Accumulated Other Comprehensive Income (Details) link:presentationLink link:calculationLink link:definitionLink 2420402 - Disclosure - Other Comprehensive Income (Loss): Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) link:presentationLink link:calculationLink link:definitionLink 2320301 - Disclosure - Other Comprehensive Income (Loss) (Tables) link:presentationLink link:calculationLink link:definitionLink 2108100 - Disclosure - Regulatory Accounting: link:presentationLink link:calculationLink link:definitionLink 2408402 - Disclosure - Regulatory Accounting (Details) link:presentationLink link:calculationLink link:definitionLink 2408403 - Disclosure - Regulatory Accounting: Rate Review (Details) link:presentationLink link:calculationLink link:definitionLink 2308301 - Disclosure - Regulatory Accounting (Tables) link:presentationLink link:calculationLink link:definitionLink 2105100 - Disclosure - Revenue: link:presentationLink link:calculationLink link:definitionLink 2305301 - Disclosure - Revenue (Tables) link:presentationLink link:calculationLink link:definitionLink 2116100 - Disclosure - Risk Management Activities: link:presentationLink link:calculationLink link:definitionLink 2416403 - Disclosure - Risk Management Activities: Cash Flow Hedges (Details) link:presentationLink link:calculationLink link:definitionLink 2416404 - 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Disclosure - Supplemental Disclosure of Cash Flow Information (Tables) link:presentationLink link:calculationLink link:definitionLink