| **Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands** | 9 Months Ended |
|------------------------------------------------------------------------------------------|----------------|
||
| **Cash Flows from Operating Activities:**                                                |           |   |
| Net income                                                                               | $ 154,492      | $ 151,120 |
| **Adjustments to reconcile net income to net cash provided by operating activities:**    |           |   |
| Depreciation and amortization                                                            | 110,504        | 104,510 |
| Provision for doubtful accounts                                                          | 4,542          | 4,559 |
| Income from equity method investments                                                    | (28,025)       | (29,908) |
| Distributions of earnings from equity method investments                                 | 16,828         | 22,401 |
| Deferred income taxes, net                                                               | 102,657        | 79,423 |
| **Changes in assets and liabilities:**                                                   |           |   |
| Gas purchase derivatives, at fair value                                                  | (2,888)        | 3,758 |
| Receivables                                                                              | 10,286         | 14,631 |
| Inventories                                                                              | 26,286         | 20,274 |
| Settlement of legal asset retirement obligations                                         | (4,836)        | (3,914) |
| Regulatory assets                                                                        | (218,285)      | 14,192 |
| Other assets                                                                             | 12,798         | 18,974 |
| Accounts payable                                                                         | (12,012)       | (20,651) |
| Contributions to benefit plans                                                           | (10,392)       | (10,814) |
| Accrued/deferred postretirement benefit costs                                            | (2,078)        | 582 |
| Gas supply derivatives, at fair value                                                    | 182,900        | 0 |
| Regulatory liabilities                                                                   | (13,377)       | 5,180 |
| Other liabilities                                                                        | (17,288)       | (1,134) |
| Net cash provided by operating activities                                                | 312,112        | 373,183 |
| **Cash Flows from Investing Activities:**                                                |           |   |
| Utility capital expenditures                                                             | (379,705)      | (308,559) |
| Allowance for borrowed funds used during construction                                    | (9,917)        | (7,935) |
| Contributions to equity method investments                                               | (30,642)       | (20,063) |
| Distributions of capital from equity method investments                                  | 9,994          | 1,285 |
| Proceeds from sale of property                                                           | 684            | 372 |
| Investments in marketable securities                                                     | (418)          | (845) |
| Other                                                                                    | 7,166          | 5,834 |
| Net cash used in investing activities                                                    | (402,838)      | (329,911) |
| **Cash Flows from Financing Activities:**                                                |           |   |
| Net (repayments) borrowings – commercial paper                                     | (100,000)      | 15,000 |
| Proceeds from issuance of long-term debt                                                 | 299,634        | 0 |
| Repayment of long-term debt                                                              | (40,000)       | 0 |
| Expenses related to issuance of debt                                                     | (3,952)        | (1) |
| Issuance of common stock through dividend reinvestment and employee stock plans          | 16,794         | 20,358 |
| Dividends paid                                                                           | (81,919)       | (77,249) |
| Other                                                                                    | (88)           | (359) |
| Net cash provided by (used in) financing activities                                      | 90,469         | (42,251) |
| Net (Decrease) Increase in Cash and Cash Equivalents                                     | (257)          | 1,021 |
| Cash and Cash Equivalents at Beginning of Period                                         | 13,744         | 9,643 |
| Cash and Cash Equivalents at End of Period                                               | 13,487         | 10,664 |
| **Cash Paid During the Period for:**                                                     |           |   |
| Interest                                                                                 | 64,422         | 58,147 |
| **Income Taxes:**                                                                        |           |   |
| Income taxes paid                                                                        | 3,436          | 2,984 |
| Income taxes refunded                                                                    | 173            | 530 |
| Income taxes, net                                                                        | 3,263          | 2,454 |
| **Noncash Investing and Financing Activities:**                                          |           |   |
| Accrued capital expenditures                                                             | $ 51,426       | $ 48,742 |

| X                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of accrued pension and other post retirement benefit costs recognized during the period, net of amounts deferred and recognized as a regulatory asset/liability.
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| - Definition
Cash outflow from total increase in earnings in the period representing the cost of equity (based on assumed rate of return) and/or borrowed funds (based on interest rate) used to finance construction of regulated assets, which is expected to be recovered through rate adjustments.
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Amount of cash paid during the period to settle an asset retirement obligation. Amounts paid to settle an asset retirement obligation are generally included in the operating section of the Statement of Cash Flows.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.
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| - Definition
Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.
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| - Definition
Future cash outflow to pay for construction in progress expenditures that have occurred.
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| - Definition
Amount of deferred income tax expense (benefit) and income tax credits.
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| - Definition
The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.
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| - Definition
This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.
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| - Definition
Amount of increase (decrease) of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.
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| - Definition
The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.
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| - Definition
The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.
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| - Definition
The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.
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| - Definition
The increase (decrease) during the reporting period in the assets (liabilities) created through trading commodity-based derivative instruments.
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| - Definition
The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.
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Amount of increase (decrease) in operating assets classified as other.
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Amount of increase (decrease) in operating liabilities classified as other.
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The increase (decrease) during the reporting period in the value of other assets that are created when regulatory agencies permits public utilities to defer costs to the balance sheet.
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The increase (decrease) during the reporting period in the total amount due within one year (or one operating cycle) from all parties, associated with underlying transactions that are classified as operating activities.
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The increase (decrease) during the reporting period in regulated liabilities. Regulated liabilities are created when regulatory agency permits an entity to defer revenues to the balance sheet.
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| - Definition
The amount of cash paid for interest during the period.
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No definition available.
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| - Definition
Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.
+ References
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| - References
No definition available.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.
+ References
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| - References
No definition available.
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| - Definition
Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash (inflow) outflow from investing activities classified as other.
+ References
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| - Definition
Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow for loan and debt issuance costs.
+ References
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| - Definition
The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.
+ References
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| - Definition
Cash outflow for purchase of trading, available-for-sale securities and held-to-maturity securities.
+ References
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| - Definition
The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.
+ References
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| - Definition
The amount of cash or cash equivalents contributed during the reporting period by the entity to fund its pension plans and its non-pension postretirement benefit plans.
+ References
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| - Definition
Cash dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations that are returns of capital. Excludes dividends or distributions from equity method investments classified as operating activities.
+ References
No definition available.
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| - Definition
The amount of cash received during the period as refunds for the overpayment of taxes.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash inflow (outflow) from financing activities classified as other.
+ References
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| - Definition
The net cash inflow or cash outflow from issuing (borrowing) and repaying commercial paper.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.
+ References
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| - Definition
The cash inflow associated with the amount received from the stock plan during the period.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.
+ References
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| - References
No definition available.
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