| **Consolidated Balance Sheets - USD ($) $ in Thousands**                                                                                     | Mar. 31, 2019 | Dec. 31, 2018 |
|----------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Assets**                                                                                                                                   |          |          |
| Property, plant and equipment, at cost                                                                                                       | $ 7,747,530   | $ 7,648,469   |
| Less: accumulated depreciation                                                                                                               | 1,727,190     | 1,718,143     |
| Net property, plant and equipment                                                                                                            | 6,020,340     | 5,930,326     |
| **Current assets:**                                                                                                                          |          |          |
| Cash and cash equivalents                                                                                                                    | 4,053         | 3,627         |
| Accounts receivable and unbilled revenues, net                                                                                               | 96,410        | 101,225       |
| Inventory, materials and supplies                                                                                                            | 16,209        | 15,844        |
| Prepayments and other current assets                                                                                                         | 24,096        | 23,337        |
| Assets held for sale                                                                                                                         | 3,007         | 3,139         |
| Total current assets                                                                                                                         | 143,775       | 147,172       |
| Regulatory assets                                                                                                                            | 803,093       | 788,076       |
| Deferred charges and other assets, net                                                                                                       | 40,745        | 39,237        |
| Investment in joint venture                                                                                                                  | 6,840         | 6,959         |
| Goodwill                                                                                                                                     | 53,069        | 52,726        |
| Operating lease right-of-use assets                                                                                                          | 13,088        |          |
| Total assets                                                                                                                                 | 7,080,950     | 6,964,496     |
| **Stockholders' equity:**                                                                                                                    |          |          |
| Common stock at $.50 par value, authorized 300,000,000 shares, issued 181,481,408 and 181,151,827 as of March 31, 2019 and December 31, 2018 | 90,741        | 90,576        |
| Capital in excess of par value                                                                                                               | 827,339       | 820,378       |
| Retained earnings                                                                                                                            | 1,152,197     | 1,174,245     |
| Treasury stock, at cost, 3,112,330 and 3,060,206 shares as of March 31, 2019 and December 31, 2018                                           | (77,692)      | (75,835)      |
| Total stockholders' equity                                                                                                                   | 1,992,585     | 2,009,364     |
| Long-term debt, excluding current portion                                                                                                    | 2,483,119     | 2,419,115     |
| Less: debt issuance costs                                                                                                                    | 20,264        | 20,651        |
| Long-term debt, excluding current portion, net of debt issuance costs                                                                        | 2,462,855     | 2,398,464     |
| Commitments and contingencies (See Note 15)                                                                                                  |               |               |
| **Current liabilities:**                                                                                                                     |          |          |
| Current portion of long-term debt                                                                                                            | 156,455       | 144,545       |
| Loans payable                                                                                                                                | 32,563        | 15,449        |
| Accounts payable                                                                                                                             | 55,110        | 77,331        |
| Book overdraft                                                                                                                               | 5,095         | 8,950         |
| Accrued interest                                                                                                                             | 27,628        | 23,300        |
| Accrued taxes                                                                                                                                | 22,563        | 22,234        |
| Interest rate swap agreements                                                                                                                | 94,561        | 59,779        |
| Other accrued liabilities                                                                                                                    | 40,124        | 47,389        |
| Total current liabilities                                                                                                                    | 434,099       | 398,977       |
| **Deferred credits and other liabilities:**                                                                                                  |          |          |
| Deferred income taxes and investment tax credits                                                                                             | 855,156       | 845,403       |
| Customers' advances for construction                                                                                                         | 99,186        | 93,343        |
| Regulatory liabilities                                                                                                                       | 528,471       | 531,027       |
| Operating lease liabilities                                                                                                                  | 11,744        |          |
| Other                                                                                                                                        | 96,897        | 97,182        |
| Total deferred credits and other liabilities                                                                                                 | 1,591,454     | 1,566,955     |
| Contributions in aid of construction                                                                                                         | 599,957       | 590,736       |
| Total liabilities and equity                                                                                                                 | $ 7,080,950   | $ 6,964,496   |

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Carrying value as of the balance sheet date 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. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.
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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.
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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.
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Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.
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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer.
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Carrying value as of the balance sheet date of payments made in excess of existing cash balances, which will be honored by the bank but reflected as a loan to the entity. Overdrafts generally have a very short time frame for correction or repayment and are therefore more similar to short-term bank financing than trade financing.
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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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Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.
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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.
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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent.
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Developers, builders, governmental agencies and municipalities will provide the entity with cash, or in some cases property, to extend its services to their properties. Nonrefundable contributions are recorded as contributions in aid of construction ("CIAC").
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Amount of deferred cost assets and assets classified as other.
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Amount, after accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.
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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, with jurisdictional netting and classified as noncurrent.
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Sum as of the balance sheet date of the (a) fair values of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and (b) the carrying amounts of the liabilities arising from financial instruments or contracts used to mitigate a specified risk (hedge), and which are expected to be extinguished or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.
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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
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| - Definition
Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
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| - Definition
Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.
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| - Definition
Amount of investment in equity method investee and investment in and advance to affiliate.
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| - Definition
Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.
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| - Definition
Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.
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| - Definition
Aggregated carrying amounts of obligations as of the balance sheet date, excluding long-term debt, incurred as part of the normal operations that are expected to be paid after one year or beyond the normal operating cycle, if longer. Alternate captions include Total Deferred Credits and Other Liabilities.
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| - Definition
Carrying value as of the balance sheet date of portion of long-term loans payable due within one year or the operating cycle if longer.
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| - Definition
Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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| - Definition
Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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| - Definition
Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.
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| - Definition
Amount of lessee's right to use underlying asset under operating lease.
+ References
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| - Definition
Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.
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| - Definition
Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.
+ References
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| - Definition
Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.
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| - Definition
Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.
+ References
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| - Definition
The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period.
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| - Definition
The cumulative amount of the reporting entity's undistributed earnings or deficit.
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| - Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
+ References
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| - Definition
The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.
+ References
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| - Definition
Debt Instrument Carrying Amount Noncurrent
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