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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current Assets:    
Cash and cash equivalents $ 22,081us-gaap_CashAndCashEquivalentsAtCarryingValue $ 22,143us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts and notes receivable-less allowances of $6,481 and $4,888, respectively 162,203us-gaap_AccountsNotesAndLoansReceivableNetCurrent 171,925us-gaap_AccountsNotesAndLoansReceivableNetCurrent
Utility energy commodity derivative assets 1,579us-gaap_EnergyMarketingContractsAssetsCurrent 1,525us-gaap_EnergyMarketingContractsAssetsCurrent
Regulatory asset for utility derivatives 16,058ava_CurrentRegulatoryAssetForUtilityDerivatives 29,640ava_CurrentRegulatoryAssetForUtilityDerivatives
Materials and supplies, fuel stock and natural gas stored 43,785us-gaap_InventoryNet 66,356us-gaap_InventoryNet
Deferred income taxes 20,589us-gaap_DeferredTaxAssetsNetCurrent 14,794us-gaap_DeferredTaxAssetsNetCurrent
Income taxes receivable 562us-gaap_IncomeTaxesReceivable 43,893us-gaap_IncomeTaxesReceivable
Other current assets 43,639us-gaap_OtherAssetsCurrent 45,071us-gaap_OtherAssetsCurrent
Total current assets 310,496us-gaap_AssetsCurrent 395,347us-gaap_AssetsCurrent
Net Utility Property:    
Utility plant in service 4,858,902us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService 4,718,062us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService
Construction work in progress 148,291us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress 227,758us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress
Total 5,007,193us-gaap_PropertyPlantAndEquipmentGross 4,945,820us-gaap_PropertyPlantAndEquipmentGross
Less: Accumulated depreciation and amortization 1,356,114us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation 1,325,858us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation
Total net utility property 3,651,079us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet 3,619,962us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet
Other Non-current Assets:    
Investment in exchange power-net 10,821us-gaap_OtherLongTermInvestments 11,433us-gaap_OtherLongTermInvestments
Investment in affiliated trusts 11,547us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures 11,547us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Goodwill 57,976us-gaap_Goodwill 57,976us-gaap_Goodwill
Long-term energy contract receivable of Spokane Energy 24,931ava_ReceivablesLongTermContractsOrProgramsNoncurrent 28,202ava_ReceivablesLongTermContractsOrProgramsNoncurrent
Other property and investments-net 41,413us-gaap_InvestmentsAndOtherNoncurrentAssets 42,016us-gaap_InvestmentsAndOtherNoncurrentAssets
Total other non-current assets 146,688us-gaap_OtherAssetsNoncurrent 151,174us-gaap_OtherAssetsNoncurrent
Deferred Charges:    
Regulatory assets for deferred income tax 98,606us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities 100,412us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities
Regulatory assets for pensions and other postretirement benefits 232,721ava_RegulatoryAssetsForPensionsAndOtherPostretirementBenefitsNoncurrent 235,758ava_RegulatoryAssetsForPensionsAndOtherPostretirementBenefitsNoncurrent
Other regulatory assets 95,618us-gaap_RegulatoryAssetsNoncurrent 91,920us-gaap_RegulatoryAssetsNoncurrent
Regulatory Asset For Interest Rate Swap Agreements Noncurrent 112,835ava_RegulatoryAssetForInterestRateSwapAgreementsNoncurrent 77,063ava_RegulatoryAssetForInterestRateSwapAgreementsNoncurrent
Non-current regulatory asset for utility derivatives 24,145ava_NoncurrentRegulatoryAssetForUtilityDerivatives 24,483ava_NoncurrentRegulatoryAssetForUtilityDerivatives
Other deferred charges 16,841us-gaap_OtherAssetsMiscellaneousNoncurrent 16,212us-gaap_OtherAssetsMiscellaneousNoncurrent
Total deferred charges 580,766us-gaap_RegulatedEntityOtherAssetsNoncurrent 545,848us-gaap_RegulatedEntityOtherAssetsNoncurrent
Total assets 4,689,029us-gaap_Assets 4,712,331us-gaap_Assets
Current Liabilities:    
Accounts payable 62,853us-gaap_AccountsPayableCurrent 112,974us-gaap_AccountsPayableCurrent
Current portion of long-term debt 3,132us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent 6,424us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Current portion of nonrecourse long-term debt of Spokane Energy 0us-gaap_OtherLongTermDebtCurrent 1,431us-gaap_OtherLongTermDebtCurrent
Short-term borrowings 65,000us-gaap_LinesOfCreditCurrent 105,000us-gaap_LinesOfCreditCurrent
Utility energy commodity derivative liabilities 14,178us-gaap_EnergyMarketingContractLiabilitiesCurrent 18,045us-gaap_EnergyMarketingContractLiabilitiesCurrent
Taxes Payable, Current 20,335us-gaap_TaxesPayableCurrent 173us-gaap_TaxesPayableCurrent
Other current liabilities 160,130us-gaap_OtherLiabilitiesCurrent 141,222us-gaap_OtherLiabilitiesCurrent
Total current liabilities 325,628us-gaap_LiabilitiesCurrent 385,269us-gaap_LiabilitiesCurrent
Long-term debt 1,495,546us-gaap_LongTermDebtAndCapitalLeaseObligations 1,492,062us-gaap_LongTermDebtAndCapitalLeaseObligations
Long-term debt to affiliated trusts 51,547us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrustNoncurrent 51,547us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrustNoncurrent
Regulatory liability for utility plant retirement costs 257,146ava_RegulatoryLiabilityForUtilityPlantRetirementCostsNoncurrent 254,140ava_RegulatoryLiabilityForUtilityPlantRetirementCostsNoncurrent
Pensions and other postretirement benefits 188,798us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent 189,489us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
Deferred income taxes 714,440us-gaap_DeferredTaxLiabilitiesNoncurrent 710,342us-gaap_DeferredTaxLiabilitiesNoncurrent
Other non-current liabilities and deferred credits 149,165us-gaap_OtherLiabilitiesNoncurrent 146,240us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 3,182,270us-gaap_Liabilities 3,229,089us-gaap_Liabilities
Commitments and Contingencies (See Notes to Consolidated Financial Statements)      
Avista Corporation Stockholders’ Equity:    
Common stock, no par value; 200,000,000 shares authorized; 62,271,133 and 62,243,374 shares outstanding 998,975us-gaap_CommonStockValue 999,960us-gaap_CommonStockValue
Accumulated other comprehensive loss (7,642)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (7,888)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Retained earnings 515,842us-gaap_RetainedEarningsAccumulatedDeficit 491,599us-gaap_RetainedEarningsAccumulatedDeficit
Total Avista Corporation stockholders’ equity 1,507,175us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 1,483,671us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Noncontrolling Interests (416)us-gaap_MinorityInterest (429)us-gaap_MinorityInterest
Total equity 1,506,759us-gaap_StockholdersEquity 1,483,242us-gaap_StockholdersEquity
Total liabilities and equity $ 4,689,029us-gaap_LiabilitiesAndStockholdersEquity $ 4,712,331us-gaap_LiabilitiesAndStockholdersEquity