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Accounting For Income Taxes (Schedule Of Deferred Income Tax Assets And Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Allowance for doubtful accounts $ 1,714us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts $ 12,202us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Reserves not currently deductible 2,889us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves 6,322us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves
Net operating loss from subsidiary acquisition 538us-gaap_DeferredTaxAssetsOtherLossCarryforwards 9,258us-gaap_DeferredTaxAssetsOtherLossCarryforwards
Deferred compensation 3,117us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther 3,676us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther
Unfunded benefit obligation 72,108us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 42,230us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Utility energy commodity derivatives 19,493us-gaap_DeferredTaxAssetsDerivativeInstruments 13,303us-gaap_DeferredTaxAssetsDerivativeInstruments
Power and natural gas deferrals 3,811ava_DeferredIncomeTaxAssetsPowerAndNaturalGasDeferrals 9,226ava_DeferredIncomeTaxAssetsPowerAndNaturalGasDeferrals
Tax credits 16,662us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 11,365us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Deferred tax assets, interest rate swaps 8,934ava_Deferredtaxassetsinterestrateswaps 0ava_Deferredtaxassetsinterestrateswaps
Other 1,776us-gaap_DeferredTaxAssetsOther 29,133us-gaap_DeferredTaxAssetsOther
Total deferred income tax assets 131,042us-gaap_DeferredTaxAssetsNet 136,715us-gaap_DeferredTaxAssetsNet
Intangible assets from subsidiary acquisition 0us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 4,271us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Differences between book and tax basis of utility plant 690,597us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 521,238us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Regulatory asset for pensions and other postretirement benefits 82,515us-gaap_DeferredTaxLiabilitiesRegulatoryAssets 54,945us-gaap_DeferredTaxLiabilitiesRegulatoryAssets
Power Exchange Contract 0ava_DeferredTaxLiabilitiesPowerExchangeContract 5,484ava_DeferredTaxLiabilitiesPowerExchangeContract
Utility energy commodity derivatives 19,495us-gaap_DeferredTaxLiabilitiesDerivatives 13,305us-gaap_DeferredTaxLiabilitiesDerivatives
Loss on reacquired debt 5,128ava_DeferredTaxLiabilitiesLossOnReacquiredDebt 5,732ava_DeferredTaxLiabilitiesLossOnReacquiredDebt
Interest rate swaps 0ava_DeferredTaxLiabilitiesInterestRateSwaps 15,097ava_DeferredTaxLiabilitiesInterestRateSwaps
Settlement with Coeur d’Alene Tribe 12,751ava_DeferredTaxLiabilitiesSettlementWithSpecificExternalParty 13,190ava_DeferredTaxLiabilitiesSettlementWithSpecificExternalParty
Other 16,104us-gaap_DeferredTaxLiabilitiesOther 14,008us-gaap_DeferredTaxLiabilitiesOther
Deferred Tax Liabilities, Gross 826,590us-gaap_DeferredIncomeTaxLiabilities 647,270us-gaap_DeferredIncomeTaxLiabilities
Total deferred income tax liabilities 695,548us-gaap_DeferredTaxLiabilities 510,555us-gaap_DeferredTaxLiabilities
Current deferred income tax asset 14,794us-gaap_DeferredTaxAssetsNetCurrent 24,788us-gaap_DeferredTaxAssetsNetCurrent
Long-term deferred income tax liability $ 710,342us-gaap_DeferredTaxLiabilitiesNoncurrent $ 535,343us-gaap_DeferredTaxLiabilitiesNoncurrent