0001001 - Document - Document and Entity Information Document link:presentationLink link:calculationLink link:definitionLink 1001002 - Statement - Condensed Consolidated Statements of Income (unaudited) link:presentationLink link:calculationLink link:definitionLink 1002003 - Statement - Condensed Consolidated Statements of Comprehensive Income (unaudited) link:presentationLink link:calculationLink link:definitionLink 1003004 - Statement - Condensed Consolidated Balance Sheets (unaudited) link:presentationLink link:calculationLink link:definitionLink 1004005 - Statement - Condensed Consolidated Statements of Cash Flows (unaudited) link:presentationLink link:calculationLink link:definitionLink 1005006 - Statement - Condensed Consolidated Statements Of Equity (unaudited) link:presentationLink link:calculationLink link:definitionLink 2101101 - Disclosure - Management's Statement: link:presentationLink link:calculationLink link:definitionLink 2202201 - Disclosure - Management's Statement (Policies) link:presentationLink link:calculationLink link:definitionLink 2303301 - Disclosure - Organization, Consolidation and Presentation of Financial Statements (Tables) link:presentationLink link:calculationLink link:definitionLink 2404401 - Disclosure - Management's Statement: Reclassification (Details) link:presentationLink link:calculationLink link:definitionLink 2405402 - Disclosure - Management's Statement: Management Statement (Details) link:presentationLink link:calculationLink link:definitionLink 2106102 - Disclosure - Revenue: link:presentationLink link:calculationLink link:definitionLink 2307302 - Disclosure - Revenue (Tables) link:presentationLink link:calculationLink link:definitionLink 2408403 - Disclosure - Revenue: Disaggregation of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 2109103 - Disclosure - Business Segment Information: link:presentationLink link:calculationLink link:definitionLink 2310303 - Disclosure - Business Segment Information (Tables) link:presentationLink link:calculationLink link:definitionLink 2411404 - Disclosure - Business Segment Information: Information Relating to Segment Statement of Income (Details) link:presentationLink link:calculationLink link:definitionLink 2412405 - Disclosure - Business Segment Information: Segment and Corporate Assets (Details) link:presentationLink link:calculationLink link:definitionLink 2113104 - Disclosure - Selected Balance Sheet Information: link:presentationLink link:calculationLink link:definitionLink 2314304 - Disclosure - Selected Balance Sheet Information (Tables) link:presentationLink link:calculationLink link:definitionLink 2415406 - Disclosure - Selected Balance Sheet Information: Accounts Receivable (Details) link:presentationLink link:calculationLink link:definitionLink 2416407 - Disclosure - Selected Balance Sheet Information: Changes to Allowance for Credit Losses (Details) link:presentationLink link:calculationLink link:definitionLink 2417408 - Disclosure - Selected Balance Sheet Information: Materials and Supplies (Details) link:presentationLink link:calculationLink link:definitionLink 2418409 - Disclosure - Selected Balance Sheet Information: Accrued Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 2119105 - Disclosure - Regulatory Matters: link:presentationLink link:calculationLink link:definitionLink 2320305 - Disclosure - Regulatory Matters (Tables) link:presentationLink link:calculationLink link:definitionLink 2421410 - Disclosure - Regulatory Matters (Details) link:presentationLink link:calculationLink link:definitionLink 2422411 - Disclosure - Regulatory Matters: Rate Review (Details) link:presentationLink link:calculationLink link:definitionLink 2123106 - Disclosure - Earnings Per Share: link:presentationLink link:calculationLink link:definitionLink 2324306 - Disclosure - Earnings Per Share (Tables) link:presentationLink link:calculationLink link:definitionLink 2425412 - Disclosure - Earnings Per Share: Earnings Per Share Reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 2426413 - Disclosure - Earnings Per Share: Anti-dilutive shares (Details) link:presentationLink link:calculationLink link:definitionLink 2127107 - Disclosure - Notes Payable, Current Maturities and Debt: link:presentationLink link:calculationLink link:definitionLink 2328307 - Disclosure - Notes Payable, Current Maturities and Debt (Tables) link:presentationLink link:calculationLink link:definitionLink 2429414 - Disclosure - Notes Payable, Current Maturities and Debt: Schedule of Short-term Debt and Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2430415 - Disclosure - Notes Payable, Current Maturities and Debt: Debt Covenants (Details) link:presentationLink link:calculationLink link:definitionLink 2431416 - Disclosure - Notes Payable, Current Maturities and Debt: Debt Offering (Details) link:presentationLink link:calculationLink link:definitionLink 2432417 - Disclosure - Notes Payable, Current Maturities and Debt: Long-Term Debt (Details) link:presentationLink link:calculationLink link:definitionLink 2133108 - Disclosure - Equity: link:presentationLink link:calculationLink link:definitionLink 2434418 - Disclosure - Equity: Equity Issuance (Details) link:presentationLink link:calculationLink link:definitionLink 2435419 - Disclosure - Equity: At-the-Market Equity Offering Program (Details) link:presentationLink link:calculationLink link:definitionLink 2136109 - Disclosure - Risk Management and Derivatives: link:presentationLink link:calculationLink link:definitionLink 2337308 - Disclosure - Risk Management and Derivatives (Tables) link:presentationLink link:calculationLink link:definitionLink 2438420 - Disclosure - Risk Management and Derivatives: Credit Risk (Details) link:presentationLink link:calculationLink link:definitionLink 2439421 - Disclosure - Risk Management and Derivatives: Utilities (Details) link:presentationLink link:calculationLink link:definitionLink 2440422 - Disclosure - Risk Management and Derivatives: Derivatives by Balance Sheet Classification (Details) link:presentationLink link:calculationLink link:definitionLink 2441423 - Disclosure - Risk Management and Derivatives: Derivatives Designated as Hedges (Details) link:presentationLink link:calculationLink link:definitionLink 2442424 - Disclosure - Risk Management and Derivatives: Derivatives Not Designated as Hedge Instruments (Details) link:presentationLink link:calculationLink link:definitionLink 2143110 - Disclosure - Fair Value Measurements: link:presentationLink link:calculationLink link:definitionLink 2344309 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 2445425 - Disclosure - Fair Value Measurements: Schedule of Fair Values (Details) link:presentationLink link:calculationLink link:definitionLink 2446426 - Disclosure - Fair Value Measurements: Other Fair Value Measurements (Details) link:presentationLink link:calculationLink link:definitionLink 2147111 - Disclosure - Other Comprehensive Income (Loss): link:presentationLink link:calculationLink link:definitionLink 2348310 - Disclosure - Other Comprehensive Income (Loss) (Tables) link:presentationLink link:calculationLink link:definitionLink 2449427 - Disclosure - Other Comprehensive Income (Loss): Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) link:presentationLink link:calculationLink link:definitionLink 2450428 - Disclosure - Other Comprehensive Income (Loss): Accumulated Other Comprehensive Income (Details) link:presentationLink link:calculationLink link:definitionLink 2151112 - Disclosure - Employee Benefit Plans: link:presentationLink link:calculationLink link:definitionLink 2352311 - Disclosure - Employee Benefit Plans (Tables) link:presentationLink link:calculationLink link:definitionLink 2453429 - Disclosure - Employee Benefit Plans: Change in Accounting Principle (Details) link:presentationLink link:calculationLink link:definitionLink 2454430 - Disclosure - Employee Benefit Plans: Funding Status of Employee Benefit Plans (Details) link:presentationLink link:calculationLink link:definitionLink 2455431 - Disclosure - Employee Benefit Plans (Details) link:presentationLink link:calculationLink link:definitionLink 2156113 - Disclosure - Commitments and Contingencies: link:presentationLink link:calculationLink link:definitionLink 2457432 - Disclosure - Commitments and Contingencies: Future Purchase Agreement - Related Party (Details) link:presentationLink link:calculationLink link:definitionLink 2158114 - Disclosure - Income Taxes: link:presentationLink link:calculationLink link:definitionLink 2459433 - Disclosure - Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 2160115 - Disclosure - Investments: link:presentationLink link:calculationLink link:definitionLink 2361312 - Disclosure - Investments (Tables) link:presentationLink link:calculationLink link:definitionLink 2462434 - Disclosure - Investments (Details) link:presentationLink link:calculationLink link:definitionLink 2163116 - Disclosure - Subsequent Events: link:presentationLink link:calculationLink link:definitionLink