| **Consolidated Statements of Cash Flows - USD ($) $ in Thousands**                    | 12 Months Ended |
|---------------------------------------------------------------------------------------|-----------------|
||
| **Cash Flows from Operating Activities:**                                             |            |   |   |
| Net income                                                                            | $ 137,011       | $ 143,801 | $ 134,417 |
| **Adjustments to reconcile net income to net cash provided by operating activities:** |            |   |   |
| Depreciation and amortization                                                         | 140,217         | 129,343 | 120,797 |
| Provision for doubtful accounts                                                       | 5,095           | 6,959 | 5,314 |
| Impairment loss on investment                                                         | 0               | 2,000 | 0 |
| Net gain on sale of property                                                          | 0               | (817) | (349) |
| Income from equity method investments                                                 | (34,461)        | (32,753) | (26,056) |
| Distributions of earnings from equity method investments                              | 24,875          | 24,843 | 22,139 |
| Deferred income taxes, net                                                            | 73,407          | 87,136 | 57,637 |
| **Changes in assets and liabilities:**                                                |            |   |   |
| Gas purchase derivatives, at fair value                                               | 3,555           | (3,064) | 1,319 |
| Receivables, net                                                                      | (2,637)         | 9,785 | (28,616) |
| Inventories                                                                           | 16,242          | (10,079) | (2,059) |
| Settlement of legal asset retirement obligations                                      | (5,563)         | (3,575) | (2,389) |
| Regulatory assets                                                                     | (14,917)        | 20,297 | 43,338 |
| Other assets                                                                          | 16,220          | (2,829) | 4,629 |
| Accounts payable                                                                      | (7,626)         | 18 | 2,381 |
| Contributions to benefit plans                                                        | (12,728)        | (22,516) | (22,415) |
| Accrued/deferred postretirement benefit costs                                         | 28,219          | 20,446 | (31,100) |
| Regulatory liabilities                                                                | (16,065)        | 49,468 | 23,429 |
| Other liabilities                                                                     | 20,791          | 12,149 | 10,831 |
| Net cash provided by operating activities                                             | 371,635         | 430,612 | 313,247 |
| **Cash Flows from Investing Activities:**                                             |            |   |   |
| Utility capital expenditures                                                          | (443,654)       | (460,444) | (599,999) |
| Allowance for borrowed funds used during construction                                 | (11,106)        | (16,427) | (30,975) |
| Contributions to equity method investments                                            | (29,723)        | (37,642) | (41,348) |
| Distributions of capital from equity method investments                               | 1,505           | 3,929 | 4,700 |
| Proceeds from sale of property                                                        | 717             | 1,883 | 1,951 |
| Investments in marketable securities                                                  | (866)           | (454) | (414) |
| Other                                                                                 | 4,707           | 4,708 | 2,609 |
| Net cash used in investing activities                                                 | (478,420)       | (504,447) | (663,476) |
| **Cash Flows from Financing Activities:**                                             |            |   |   |
| Borrowings under credit facility                                                      | 0               | 0 | 10,000 |
| Repayments under credit facility                                                      | 0               | 0 | (10,000) |
| Net (repayments) borrowings - commercial paper                                        | (15,000)        | (45,000) | 35,000 |
| Proceeds from issuance of long-term debt, net of discount                             | 149,902         | 249,565 | 299,856 |
| Repayment of long-term debt                                                           | 0               | (100,000) | 0 |
| Expenses related to issuance of debt                                                  | (1,330)         | (2,871) | (3,250) |
| Proceeds from issuance of common stock, net of expenses                               | 53,707          | 47,290 | 92,271 |
| Issuance of common stock through dividend reinvestment and employee stock plans       | 26,992          | 25,556 | 24,610 |
| Dividends paid                                                                        | (103,390)       | (99,151) | (92,146) |
| Other                                                                                 | 5               | 26 | (8) |
| Net cash provided by financing activities                                             | 110,886         | 75,415 | 356,333 |
| Net Increase in Cash and Cash Equivalents                                             | 4,101           | 1,580 | 6,104 |
| Cash and Cash Equivalents at Beginning of Year                                        | 9,643           | 8,063 | 1,959 |
| Cash and Cash Equivalents at End of Year                                              | 13,744          | 9,643 | 8,063 |
| **Cash Paid During the Year for:**                                                    |            |   |   |
| Interest                                                                              | 71,519          | 64,276 | 50,275 |
| **Income Taxes:**                                                                     |            |   |   |
| Income taxes paid                                                                     | 3,680           | 10,840 | 5,760 |
| Income taxes refunded                                                                 | 530             | 30 | 169 |
| Income taxes, net                                                                     | 3,150           | 10,810 | 5,591 |
| **Noncash Investing and Financing Activities:**                                       |            |   |   |
| Accrued construction expenditures                                                     | $ 58,868        | $ 38,869 | $ 39,389 |

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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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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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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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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 gain (loss) on sale or disposal of oil and gas property or timber property.
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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.
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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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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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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 fair value of other financial instruments used in operating activities.
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The increase (decrease) during the reporting period in other assets used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets, other noncurrent assets, or a combination of other current and noncurrent assets.
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The increase (decrease) during the reporting period in other liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current liabilities, other noncurrent liabilities, or a combination of other current and noncurrent liabilities.
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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.
+ References
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| - References
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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
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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
The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.
+ 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
The cash inflow from bank borrowing during the year.
+ 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 the additional capital contribution to the entity.
+ 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
The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.
+ 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
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow to settle a bank borrowing during the year.
+ 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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