2104100 - Disclosure - Accounts Receivable: link:presentationLink link:calculationLink link:definitionLink 2404402 - Disclosure - Accounts Receivable: (Details) link:presentationLink link:calculationLink link:definitionLink 2304301 - Disclosure - Accounts Receivable: (Tables) link:presentationLink link:calculationLink link:definitionLink 2120100 - Disclosure - Accrued Liabilities: link:presentationLink link:calculationLink link:definitionLink 2420402 - Disclosure - Accrued Liabilities: (Details) link:presentationLink link:calculationLink link:definitionLink 2320301 - Disclosure - Accrued Liabilities: (Tables) link:presentationLink link:calculationLink link:definitionLink 2102100 - Disclosure - Acquisition: link:presentationLink link:calculationLink link:definitionLink 2402402 - Disclosure - Acquisition: (Details) link:presentationLink link:calculationLink link:definitionLink 2402403 - Disclosure - Acquisition: Noncontrolling Interest (Details) link:presentationLink link:calculationLink link:definitionLink 2302301 - Disclosure - Acquisition: (Tables) link:presentationLink link:calculationLink link:definitionLink 2103100 - Disclosure - Business Segment Information: link:presentationLink link:calculationLink link:definitionLink 2403402 - Disclosure - Business Segment Information: Information Relating to Segment Statement of Income (Details) link:presentationLink link:calculationLink link:definitionLink 2403403 - Disclosure - Business Segment Information: Segment and Corporate Assets (Details) link:presentationLink link:calculationLink link:definitionLink 2303301 - Disclosure - Business Segment Information: (Tables) link:presentationLink link:calculationLink link:definitionLink 2117100 - Disclosure - Commitments and Contingencies: link:presentationLink link:calculationLink link:definitionLink 2417401 - Disclosure - Commitments and Contingencies: Dividend Restrictions (Details) link:presentationLink link:calculationLink link:definitionLink 1004000 - Statement - Condensed Consolidated Balance Sheets (unaudited) link:presentationLink link:calculationLink link:definitionLink 1004001 - Statement - Condensed Consolidated Balance Sheets (unaudited) (Parentheticals) link:presentationLink link:calculationLink link:definitionLink 1003001 - Statement - Condensed Consolidated Statement of Comprehensive Income (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 1003000 - Statement - Condensed Consolidated Statement of Comprehensive Income (unaudited) link:presentationLink link:calculationLink link:definitionLink 1005000 - Statement - Condensed Consolidated Statements of Cash Flows (unaudited) link:presentationLink link:calculationLink link:definitionLink 1005000 - Statement - Condensed Consolidated Statements of Cash Flows (unaudited) link:presentationLink link:calculationLink link:definitionLink 1002000 - Statement - Condensed Consolidated Statements of Income (unaudited) link:presentationLink link:calculationLink link:definitionLink 0001000 - Document - Document and Entity Information Document link:presentationLink link:calculationLink link:definitionLink 2107100 - Disclosure - Earnings Per Share: link:presentationLink link:calculationLink link:definitionLink 2407403 - Disclosure - Earnings Per Share: Anti-dilutive shares (Details) link:presentationLink link:calculationLink link:definitionLink 2407402 - Disclosure - Earnings Per Share: Earnings Per Share Reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 2307301 - Disclosure - Earnings Per Share: (Tables) link:presentationLink link:calculationLink link:definitionLink 2116100 - Disclosure - Employee Benefit Plans: link:presentationLink link:calculationLink link:definitionLink 2416402 - Disclosure - Employee Benefit Plans: (Details) link:presentationLink link:calculationLink link:definitionLink 2316301 - Disclosure - Employee Benefit Plans: (Tables) link:presentationLink link:calculationLink link:definitionLink 2109100 - Disclosure - Equity: link:presentationLink link:calculationLink link:definitionLink 2409403 - Disclosure - Equity: At-the-Market Equity Offering Program (Details) link:presentationLink link:calculationLink link:definitionLink 2409402 - Disclosure - Equity: Stockholders Equity Recap (Details) link:presentationLink link:calculationLink link:definitionLink 2309301 - Disclosure - Equity: (Tables) link:presentationLink link:calculationLink link:definitionLink 2409404 - Disclosure - Equity: Variable Interest Entities (Details) link:presentationLink link:calculationLink link:definitionLink 2112100 - Disclosure - Fair Value Measurements: link:presentationLink link:calculationLink link:definitionLink 2412403 - Disclosure - Fair Value Measurements: Balance Sheet Location (Details) link:presentationLink link:calculationLink link:definitionLink 2412402 - Disclosure - Fair Value Measurements: Schedule of Fair Values (Details) link:presentationLink link:calculationLink link:definitionLink 2312301 - Disclosure - Fair Value Measurements: (Tables) link:presentationLink link:calculationLink link:definitionLink 2113100 - Disclosure - Fair Value of Financial Instruments: link:presentationLink link:calculationLink link:definitionLink 2413402 - Disclosure - Fair Value of Financial Instruments: (Details) link:presentationLink link:calculationLink link:definitionLink 2313301 - Disclosure - Fair Value of Financial Instruments: (Tables) link:presentationLink link:calculationLink link:definitionLink 2118100 - Disclosure - Impairment of Assets: link:presentationLink link:calculationLink link:definitionLink 2418401 - Disclosure - Impairment of Assets: Impairment of Long-lived assets (Details) link:presentationLink link:calculationLink link:definitionLink 2119100 - Disclosure - Income Taxes: link:presentationLink link:calculationLink link:definitionLink 2419402 - Disclosure - Income Taxes: (Details) link:presentationLink link:calculationLink link:definitionLink 2319301 - Disclosure - Income Taxes: (Tables) link:presentationLink link:calculationLink link:definitionLink 2101100 - Disclosure - Management's Statement: link:presentationLink link:calculationLink link:definitionLink 2401403 - Disclosure - Management's Statement: Improvements To Employee Share-Based Payment Accounting (Details) link:presentationLink link:calculationLink link:definitionLink 2201201 - Disclosure - Management's Statement: (Policies) link:presentationLink link:calculationLink link:definitionLink 2401402 - Disclosure - Management's Statement: Revisions (Details) link:presentationLink link:calculationLink link:definitionLink 2106100 - Disclosure - Materials, Supplies and Fuel: link:presentationLink link:calculationLink link:definitionLink 2406402 - Disclosure - Materials, Supplies and Fuel: (Details) link:presentationLink link:calculationLink link:definitionLink 2306301 - Disclosure - Materials, Supplies and Fuel: (Tables) link:presentationLink link:calculationLink link:definitionLink 2108100 - Disclosure - Notes Payable: link:presentationLink link:calculationLink link:definitionLink 2408403 - Disclosure - Notes Payable: Debt covenants (Details) link:presentationLink link:calculationLink link:definitionLink 2408402 - Disclosure - Notes Payable: Schedule of Short-term Debt and Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2308301 - Disclosure - Notes Payable: (Tables) link:presentationLink link:calculationLink link:definitionLink 2114100 - Disclosure - Other Comprehensive Income (Loss): link:presentationLink link:calculationLink link:definitionLink 2414403 - Disclosure - Other Comprehensive Income (Loss): Accumulated Other Comprehensive Income (Details) link:presentationLink link:calculationLink link:definitionLink 2414402 - Disclosure - Other Comprehensive Income (Loss): Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) link:presentationLink link:calculationLink link:definitionLink 2314301 - Disclosure - Other Comprehensive Income (Loss): (Tables) link:presentationLink link:calculationLink link:definitionLink 2105100 - Disclosure - Regulatory Accounting: link:presentationLink link:calculationLink link:definitionLink 2405402 - Disclosure - Regulatory Accounting: (Details) link:presentationLink link:calculationLink link:definitionLink 2305301 - Disclosure - Regulatory Accounting: (Tables) link:presentationLink link:calculationLink link:definitionLink 2110100 - Disclosure - Risk Management Activities: link:presentationLink link:calculationLink link:definitionLink 2410406 - Disclosure - Risk Management Activities: Derivatives Not Designated as Hedge Instruments (Details) link:presentationLink link:calculationLink link:definitionLink 2410404 - Disclosure - Risk Management Activities: Financing Activities (Details) link:presentationLink link:calculationLink link:definitionLink 2410405 - Disclosure - Risk Management Activities: Hedging Activities (Details) link:presentationLink link:calculationLink link:definitionLink 2410402 - Disclosure - Risk Management Activities: Oil and Gas (Details) link:presentationLink link:calculationLink link:definitionLink 2310301 - Disclosure - Risk Management Activities: (Tables) link:presentationLink link:calculationLink link:definitionLink 2410403 - Disclosure - Risk Management Activities: Utilities (Details) link:presentationLink link:calculationLink link:definitionLink 2115100 - Disclosure - Supplemental Disclosure of Cash Flow Information: link:presentationLink link:calculationLink link:definitionLink 2415402 - Disclosure - Supplemental Disclosure of Cash Flow Information: (Details) link:presentationLink link:calculationLink link:definitionLink 2315301 - Disclosure - Supplemental Disclosure of Cash Flow Information: (Tables) link:presentationLink link:calculationLink link:definitionLink