Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATIONS:
Net income	$ 22,209us-gaap_NetIncomeLoss	$ 23,706us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	48,524	46,302
(Deferral) amortization of regulatory assets	(1,008)us-gaap_AmortizationOfRegulatoryAsset	808us-gaap_AmortizationOfRegulatoryAsset
Amortization of debt premium	264	232
Deferred income taxes and investment tax credit adjustments - net	12,177	880
Allowance for equity funds used during construction	(3,152)	(1,552)
Change in certain assets and liabilities:
Accounts receivable	848	(6,262)
Fuel, materials and supplies	(8,900)us-gaap_IncreaseDecreaseInInventories	10,860us-gaap_IncreaseDecreaseInInventories
Income taxes receivable or payable		9,925
Financial transmission rights	4,921	2,931
Accounts payable and accrued expenses	10,299	(3,029)
Accrued real estate and personal property taxes	5,066	4,299
Accrued interest	18,654	17,484
Pension and other postretirement benefit expenses	(26,579)	(54,862)
Short-term and long-term regulatory assets and liabilities	(2,233)	(13,587)
Prepaids and other current assets	(5,445)	(8,955)
Other - net	331	220
Net cash provided by operating activities	75,976	29,400
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures - utility	(112,960)	(41,153)
Project development costs	(1,183)	(1,209)
Cost of removal, net of salvage	(1,811)	(843)
Other	(50)	(51)
Net cash used in investing activities	(116,004)	(43,256)
CASH FLOWS FROM FINANCING ACTIVITIES:
Short-term debt borrowings	77,000us-gaap_ProceedsFromShortTermDebt	80,000us-gaap_ProceedsFromShortTermDebt
Short-term debt repayments	(15,000)us-gaap_RepaymentsOfShortTermDebt	(20,000)us-gaap_RepaymentsOfShortTermDebt
Dividends on common stock	(18,247)us-gaap_PaymentsOfDividendsCommonStock	(19,800)us-gaap_PaymentsOfDividendsCommonStock
Issuance of common stock	2
Preferred dividends of subsidiary	(803)	(803)
Retention payments on capital expenditure	(397)
Other	(202)	(21)
Net cash provided by financing activities	42,353	39,376
Net change in cash and cash equivalents	2,325	25,520
Cash and cash equivalents at beginning of period	26,933	19,067
Cash and cash equivalents at end of period	29,258	44,587
Cash paid during the period for:
Interest (net of amount capitalized)	6,766us-gaap_InterestPaidNet	8,417us-gaap_InterestPaidNet
Income taxes
Non-cash investing activities:
Accruals for capital expenditures	$ 45,207	$ 19,810

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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+ Details

Name:	us-gaap_PaymentsOfDividendsCommonStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity.

+ References

+ Details

Name:	us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

+ Details

Name:	us-gaap_PaymentsToAcquireProductiveAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfCommonStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

+ Details

Name:	us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_ProceedsFromShortTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

Name:	us-gaap_RepaymentsOfShortTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration