Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating Activities:
Net income	$ 46,462us-gaap_ProfitLoss	$ 48,981us-gaap_ProfitLoss
Non-cash items included in net income:
Depreciation and amortization	35,379	34,582
Provision for deferred income taxes	(82)us-gaap_DeferredIncomeTaxExpenseBenefit	1,453us-gaap_DeferredIncomeTaxExpenseBenefit
Power and natural gas cost amortizations (deferrals), net	8,196	(8,041)
Amortization of debt expense	895us-gaap_AmortizationOfFinancingCosts	953us-gaap_AmortizationOfFinancingCosts
Amortization of investment in exchange power	613ava_OtherAmortization	613ava_OtherAmortization
Stock-based compensation expense	1,707us-gaap_ShareBasedCompensation	1,551us-gaap_ShareBasedCompensation
Equity-related AFUDC	(2,215)	(2,034)
Pension and other postretirement benefit expense	9,217	7,415
Amortization of Spokane Energy contract	3,271ava_AmortizationOfEnergyContract	3,007ava_AmortizationOfEnergyContract
Other	(3,077)	4,212
Contributions to defined benefit pension plan	(4,000)us-gaap_PensionContributions	(11,000)us-gaap_PensionContributions
Changes in working capital components:
Accounts and notes receivable	2,664	17,257
Materials and supplies, fuel stock and natural gas stored	22,571us-gaap_IncreaseDecreaseInInventories	12,141us-gaap_IncreaseDecreaseInInventories
Decrease (Increase) in Collateral Posted for Derivative Instruments	(18,516)	26,756
Increase (Decrease) in Income Taxes Receivable	43,331	7,783
Other current assets	471	(1,494)
Accounts payable	(30,545)	(11,065)
Increase (Decrease) in Income Taxes Payable	20,162	19,412
Other current liabilities	10,274	4,416
Net cash provided by operating activities	146,778	156,898
Investing Activities:
Utility property capital expenditures (excluding equity-related AFUDC)	(81,597)	(59,725)
Other capital expenditures	(412)	(3,929)
Federal grant payments received	943ava_GrantProceedsFromOutsideParties	876ava_GrantProceedsFromOutsideParties
Decrease (increase) In Money Market Funds Held For Clients	0	(9,346)
Sale and maturity of securities available for sale	0	11,403
Other	891	24
Net cash used in investing activities	(80,175)	(60,697)
Financing Activities:
Net decrease in short-term borrowings	(40,000)	(60,000)
Repayment of borrowings from Ecova line of credit	0us-gaap_RepaymentsOfLinesOfCredit	(4,000)us-gaap_RepaymentsOfLinesOfCredit
Redemption and maturity of long-term debt	(639)us-gaap_RepaymentsOfLongTermDebt	(69)us-gaap_RepaymentsOfLongTermDebt
Maturity of nonrecourse long-term debt of Spokane Energy	(1,431)us-gaap_RepaymentsOfOtherDebt	(3,966)us-gaap_RepaymentsOfOtherDebt
Issuance of common stock	371	638
Payments for Repurchase of Common Stock	(2,920)	0
Cash dividends paid	(20,717)us-gaap_PaymentsOfDividends	(19,217)us-gaap_PaymentsOfDividends
Decrease in client fund obligations	0	(1,989)
Other	(1,329)	0
Net cash used in financing activities	(66,665)	(88,603)
Net increase (decrease) in cash and cash equivalents	(62)	7,598
Cash and cash equivalents at beginning of period	22,143	82,574
Cash and cash equivalents at end of period	$ 22,081	$ 90,172

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