000010001 - Document - Cover Page link:presentationLink link:calculationLink link:definitionLink 100010002 - Statement - Consolidated Statements of Income link:presentationLink link:calculationLink link:definitionLink 100020003 - Statement - Consolidated Statements of Comprehensive Income link:presentationLink link:calculationLink link:definitionLink 100030004 - Statement - Cosolidated Statements of Comprehensive Income (parentheticals) link:presentationLink link:calculationLink link:definitionLink 100040005 - Statement - Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 100050006 - Statement - Consolidated Balance Sheets (parentheticals) link:presentationLink link:calculationLink link:definitionLink 100060007 - Statement - Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 100070008 - Statement - Consolidated Statements of Equity link:presentationLink link:calculationLink link:definitionLink 100080009 - Statement - Consolidated Statement of Equity (Parentheticals) link:presentationLink link:calculationLink link:definitionLink 210011001 - Disclosure - Business Description And Significant Accounting Policies: link:presentationLink link:calculationLink link:definitionLink 220022001 - Disclosure - Business Description And Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 230033001 - Disclosure - Business Description And Significant Accounting Policies (Tables) link:presentationLink link:calculationLink link:definitionLink 240044001 - Disclosure - Business Description And Significant Accounting Policies: Accounts Receivable (Details) link:presentationLink link:calculationLink link:definitionLink 240054002 - Disclosure - Business Description And Significant Accounting Policies: Allowance for Doubtful Accounts (Details) link:presentationLink link:calculationLink link:definitionLink 240064003 - Disclosure - Business Description And Significant Accounting Policies: Materials, Supplies and Fuel (Details) link:presentationLink link:calculationLink link:definitionLink 240074004 - Disclosure - Business Description And Significant Accounting Policies: Investments (Details) link:presentationLink link:calculationLink link:definitionLink 240084005 - Disclosure - Business Description And Significant Accounting Policies: Goodwill (Details) link:presentationLink link:calculationLink link:definitionLink 240094006 - Disclosure - Business Description And Significant Accounting Policies: Schedule of Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 240104007 - Disclosure - Business Description And Significant Accounting Policies: Accrued Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 240114008 - Disclosure - Business Description And Significant Accounting Policies: Regulatory Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 240124009 - Disclosure - Business Description And Significant Accounting Policies: Earnings per Share (Details) link:presentationLink link:calculationLink link:definitionLink 240134010 - Disclosure - Business Description And Significant Accounting Policies: Anti-dilutive shares (Details) link:presentationLink link:calculationLink link:definitionLink 240144011 - Disclosure - Business Description And Significant Accounting Policies: Recently Adopted Accounting Standards (Details) link:presentationLink link:calculationLink link:definitionLink 210151002 - Disclosure - Regulatory Matters: link:presentationLink link:calculationLink link:definitionLink 230163002 - Disclosure - Regulatory Matters (Tables) link:presentationLink link:calculationLink link:definitionLink 240174012 - Disclosure - Regulatory Matters: Regulatory Matters (Details) link:presentationLink link:calculationLink link:definitionLink 240184013 - Disclosure - Regulatory Matters: Gas Price Derivatives (Details) link:presentationLink link:calculationLink link:definitionLink 240194014 - Disclosure - Regulatory Matters: Decommissioning Costs (Details) link:presentationLink link:calculationLink link:definitionLink 240204015 - Disclosure - Regulatory Matters: Gas Supply Contract Termination (Details) link:presentationLink link:calculationLink link:definitionLink 240214016 - Disclosure - Regulatory Matters: Regulatory Activity (Details) link:presentationLink link:calculationLink link:definitionLink 240224017 - Disclosure - Regulatory Matters: Electric Utilities Regulatory Activity (Details) link:presentationLink link:calculationLink link:definitionLink 240234018 - Disclosure - Regulatory Matters: Gas Utilities Regulatory Activity (Details) link:presentationLink link:calculationLink link:definitionLink 210241003 - Disclosure - Commitment, Contingencies And Guarantees: link:presentationLink link:calculationLink link:definitionLink 230253003 - Disclosure - Commitment, Contingencies And Guarentees (Tables) link:presentationLink link:calculationLink link:definitionLink 240264019 - Disclosure - Commitment, Contingencies And Guarentees: Power Purchase and Transmission Services Agreements (Details) link:presentationLink link:calculationLink link:definitionLink 240274020 - Disclosure - Commitment, Contingencies And Guarentees: Power Purchase Agreement - Related Party (Details) link:presentationLink link:calculationLink link:definitionLink 240284021 - Disclosure - Commitment, Contingencies And Guarentees: Purchase Commitment (Details) link:presentationLink link:calculationLink link:definitionLink 240294022 - Disclosure - Commitment, Contingencies And Guarentees: Unconditional Purchase Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 240304023 - Disclosure - Commitment, Contingencies And Guarentees: Power Sales Agreements (Details) link:presentationLink link:calculationLink link:definitionLink 240314024 - Disclosure - Commitment, Contingencies And Guarentees: Reclamation Liability (Details) link:presentationLink link:calculationLink link:definitionLink 240324025 - Disclosure - Commitment, Contingencies And Guarentees: Manufactured Gas Processing (Details) link:presentationLink link:calculationLink link:definitionLink 240334026 - Disclosure - Commitment, Contingencies And Guarentees: Guarantees (Details) link:presentationLink link:calculationLink link:definitionLink 210341004 - Disclosure - Revenue: link:presentationLink link:calculationLink link:definitionLink 230353004 - Disclosure - Revenue (Tables) link:presentationLink link:calculationLink link:definitionLink 240364027 - Disclosure - Revenue: Disaggregation of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 210371005 - Disclosure - Property, Plant And Equipment: link:presentationLink link:calculationLink link:definitionLink 230383005 - Disclosure - Property, Plant and Equipment (Tables) link:presentationLink link:calculationLink link:definitionLink 240394028 - Disclosure - Property, Plant and Equipment (Details) link:presentationLink link:calculationLink link:definitionLink 210401006 - Disclosure - Jointly Owned Facilities: link:presentationLink link:calculationLink link:definitionLink 230413006 - Disclosure - Jointly Owned Facilities (Tables) link:presentationLink link:calculationLink link:definitionLink 240424029 - Disclosure - Jointly Owned Facilities (Details) link:presentationLink link:calculationLink link:definitionLink 240434030 - Disclosure - Jointly Owned Facilities - Related Party (Details) link:presentationLink link:calculationLink link:definitionLink 210441007 - Disclosure - Asset Retirement Obligations: link:presentationLink link:calculationLink link:definitionLink 230453007 - Disclosure - Asset Retirement Obligations (Tables) link:presentationLink link:calculationLink link:definitionLink 240464031 - Disclosure - Asset Retirement Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 210471008 - Disclosure - Leases: link:presentationLink link:calculationLink link:definitionLink 230483008 - Disclosure - Leases (Tables) link:presentationLink link:calculationLink link:definitionLink 240494032 - Disclosure - Operating Leases (Details) link:presentationLink link:calculationLink link:definitionLink 240504033 - Disclosure - Lessee - Lease Costs (Details) link:presentationLink link:calculationLink link:definitionLink 240514034 - Disclosure - Lessee - Supplemental Balance Sheet Information (Details) link:presentationLink link:calculationLink link:definitionLink 240524035 - Disclosure - Lessee - Supplemental Cash Flow Information (Details) link:presentationLink link:calculationLink link:definitionLink 240534036 - Disclosure - Lessee - Weighted Average Information (Details) link:presentationLink link:calculationLink link:definitionLink 240544037 - Disclosure - Lessee - Future Minimum Payments (Details) link:presentationLink link:calculationLink link:definitionLink 240544037 - Disclosure - Lessee - Future Minimum Payments (Details) link:presentationLink link:calculationLink link:definitionLink 240554038 - Disclosure - Lessor (Details) link:presentationLink link:calculationLink link:definitionLink 240564039 - Disclosure - Lessor - Future Minimum Payments (Details) link:presentationLink link:calculationLink link:definitionLink 210571009 - Disclosure - Debt and Credit Facilities: link:presentationLink link:calculationLink link:definitionLink 230583009 - Disclosure - Debt and Credit Facilities (Tables) link:presentationLink link:calculationLink link:definitionLink 240594040 - Disclosure - Short-Term Debt: (Details) link:presentationLink link:calculationLink link:definitionLink 240604041 - Disclosure - Long-Term Debt (Details) link:presentationLink link:calculationLink link:definitionLink 240614042 - Disclosure - Long-Term Debt: Aggregate Maturities of Long Term Debt (Details) link:presentationLink link:calculationLink link:definitionLink 240624043 - Disclosure - Long-Term Debt: Amortization Expense (Details) link:presentationLink link:calculationLink link:definitionLink 240634044 - Disclosure - Long-Term Debt: Debt Transactions (Details) link:presentationLink link:calculationLink link:definitionLink 240644045 - Disclosure - Debt Covenants (Details) link:presentationLink link:calculationLink link:definitionLink 240654046 - Disclosure - Long-Term Debt: Dividend Restrictions (Details) link:presentationLink link:calculationLink link:definitionLink 210661010 - Disclosure - Stockholders' Equity: link:presentationLink link:calculationLink link:definitionLink 240674047 - Disclosure - Stockholders' Equity: Equity Issuance (Details) link:presentationLink link:calculationLink link:definitionLink 240684048 - Disclosure - Equity: At-the-Market Equity Offering Program (Details) link:presentationLink link:calculationLink link:definitionLink 240694049 - Disclosure - Equity: Shareholder Dividend Reinvestment and Stock Purchase Plan (Details) link:presentationLink link:calculationLink link:definitionLink 240704050 - Disclosure - Equity: Preferred Stock (Details) link:presentationLink link:calculationLink link:definitionLink 210711011 - Disclosure - Risk Management And Derivatives: link:presentationLink link:calculationLink link:definitionLink 230723010 - Disclosure - Risk Management And Derivatives (Tables) link:presentationLink link:calculationLink link:definitionLink 240734051 - Disclosure - Risk Management And Derivatives: Market and Credit Risk Disclosures (Details) link:presentationLink link:calculationLink link:definitionLink 240744052 - Disclosure - Risk Management Activities: Utilities (Details) link:presentationLink link:calculationLink link:definitionLink 240754053 - Disclosure - Risk Management And Derivatives: Derivatives by Balance Sheet Classification (Details) link:presentationLink link:calculationLink link:definitionLink 240764054 - Disclosure - Risk Management Activities: Cash Flow Hedges (Details) link:presentationLink link:calculationLink link:definitionLink 240774055 - Disclosure - Risk Management Activities: Derivatives Not Designated as Hedge Instruments (Details) link:presentationLink link:calculationLink link:definitionLink 210781012 - Disclosure - Fair Value Measurements: link:presentationLink link:calculationLink link:definitionLink 230793011 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 240804056 - Disclosure - Fair Value Measurements: Recurring Fair Value Measurements (Details) link:presentationLink link:calculationLink link:definitionLink 240814057 - Disclosure - Fair Value Measurements: Other Fair Value Measurements (Details) link:presentationLink link:calculationLink link:definitionLink 210821013 - Disclosure - Other Comprehensive Income: link:presentationLink link:calculationLink link:definitionLink 230833012 - Disclosure - Other Comprehensive Income (Tables) link:presentationLink link:calculationLink link:definitionLink 240844058 - Disclosure - Other Comprehensive Income (Details) link:presentationLink link:calculationLink link:definitionLink 240854059 - Disclosure - Other Comprehensive Income: Accumulated Other Comprehensive Income (Details) link:presentationLink link:calculationLink link:definitionLink 210861014 - Disclosure - Variable Interest Entity link:presentationLink link:calculationLink link:definitionLink 230873013 - Disclosure - Variable Interest Entity (Tables) link:presentationLink link:calculationLink link:definitionLink 240884060 - Disclosure - Variable Interest Entity: (Details) link:presentationLink link:calculationLink link:definitionLink 210891015 - Disclosure - Employee Benefits Plans: link:presentationLink link:calculationLink link:definitionLink 230903014 - Disclosure - Employee Benefit Plans (Tables) link:presentationLink link:calculationLink link:definitionLink 240914061 - Disclosure - Defined Contribution Plans (Details) link:presentationLink link:calculationLink link:definitionLink 240924062 - Disclosure - Defined Benefit Pension Plan (Details) link:presentationLink link:calculationLink link:definitionLink 240934063 - Disclosure - Plan Contributions (Details) link:presentationLink link:calculationLink link:definitionLink 240944064 - Disclosure - Fair Value Measurements (Details) link:presentationLink link:calculationLink link:definitionLink 240954065 - Disclosure - Employee Benefit Plans: Employee Benefit Plan Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 240964066 - Disclosure - Employee Benefit Plans: Fair Value Employee Benefit Plan Assets (Details) link:presentationLink link:calculationLink link:definitionLink 240974067 - Disclosure - Employee Benefit Plans: Amounts Recognized in the Consolidated Balance Sheets (Details) link:presentationLink link:calculationLink link:definitionLink 240984068 - Disclosure - Employee Benefit Plans: Accumulated Benefit Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 240994069 - Disclosure - Employee Benefit Plans: Components of Net Periodic Expense (Details) link:presentationLink link:calculationLink link:definitionLink 241004070 - Disclosure - Employee Benefit Plans: Change in Accounting Principal (Details) link:presentationLink link:calculationLink link:definitionLink 241014071 - Disclosure - Employee Benefit Plans: AOCI Amounts (After-Tax) (Details) link:presentationLink link:calculationLink link:definitionLink 241024072 - Disclosure - Assumptions (Details) link:presentationLink link:calculationLink link:definitionLink 211031016 - Disclosure - Share-based Compensation Plans: link:presentationLink link:calculationLink link:definitionLink 231043015 - Disclosure - Share-based Compensation Plans (Tables) link:presentationLink link:calculationLink link:definitionLink 241054073 - Disclosure - Compensation Related Costs, Share Based Payments (Details) link:presentationLink link:calculationLink link:definitionLink 241064074 - Disclosure - Stock Options (Details) link:presentationLink link:calculationLink link:definitionLink 241074075 - Disclosure - Restricted Stock (Details) link:presentationLink link:calculationLink link:definitionLink 241084076 - Disclosure - Performance Share Plan (Details) link:presentationLink link:calculationLink link:definitionLink 211091017 - Disclosure - Income Taxes: link:presentationLink link:calculationLink link:definitionLink 231103016 - Disclosure - Income Taxes (Tables) link:presentationLink link:calculationLink link:definitionLink 241114077 - Disclosure - Income Taxes: CARES Act (Details) link:presentationLink link:calculationLink link:definitionLink 241124078 - Disclosure - Income Taxes: Tax Cut and Jobs Act (Details) link:presentationLink link:calculationLink link:definitionLink 241134079 - Disclosure - Income Taxes: Current and Deferred Income Tax Expense (Benefit) (Details) link:presentationLink link:calculationLink link:definitionLink 241144080 - Disclosure - Income Taxes: Effective Tax Rate Differences From Statutory Tax Rates (Details) link:presentationLink link:calculationLink link:definitionLink 241154081 - Disclosure - Income Taxes: Deferred Income Tax Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 241164082 - Disclosure - Income Taxes: Net Operating Loss Carryforwards (Details) link:presentationLink link:calculationLink link:definitionLink 241174083 - Disclosure - Income Taxes: Reconciliation of unrecognized tax benefits (Details) link:presentationLink link:calculationLink link:definitionLink 241184084 - Disclosure - Income Taxes: Interest, Penalties and Audits (Details) link:presentationLink link:calculationLink link:definitionLink 241194085 - Disclosure - Income Taxes: Carryforwards, State and Foreign Tax Credits (Details) link:presentationLink link:calculationLink link:definitionLink 211201018 - Disclosure - Business Segment Information: link:presentationLink link:calculationLink link:definitionLink 231213017 - Disclosure - Business Segment Information (Tables) link:presentationLink link:calculationLink link:definitionLink 241224086 - Disclosure - Business Segment Information: Segment Assets (Details) link:presentationLink link:calculationLink link:definitionLink 241234087 - Disclosure - Business Segment Information: Capital Expenditures and Asset Acquisitions (Details) link:presentationLink link:calculationLink link:definitionLink 241244088 - Disclosure - Business Segment Information: Property, Plant and Equipment (Details) link:presentationLink link:calculationLink link:definitionLink 241254089 - Disclosure - Business Segment Information: Information Relating to Segments Statement of Income (Details) link:presentationLink link:calculationLink link:definitionLink 211261019 - Disclosure - Subsequent Events link:presentationLink link:calculationLink link:definitionLink 241274090 - Disclosure - Subsequent Events (Details) link:presentationLink link:calculationLink link:definitionLink