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Summary Of Significant Accounting Policies (Investments And Funds Held For Customers) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]      
Sale and maturity of securities available for sale $ 14,612us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities $ 22,960us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities $ 137,999us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Cash and Cash Equivalents, Amortized Cost   16,147ava_CashAndCashEquivalentsAmortizedCost [1]  
Cash And Cash Equivalents Unrealized Gain Loss   0ava_CashAndCashEquivalentsUnrealizedGainLoss  
Money market funds   16,147us-gaap_CashAndCashEquivalentsFairValueDisclosure  
Money Market Funds, Amortized Cost   11,180ava_MoneyMarketFundsAmortizedCost  
Money Market Funds, Unrealized Gain Loss   0ava_MoneyMarketFundsUnrealizedGainLoss  
Total securities available for sale, Amortized Cost   71,883us-gaap_AvailableForSaleSecuritiesAmortizedCost [1]  
Total securities available for sale, Unrealized Gain (Loss)   (2,522)us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1  
Available-for-sale Securities   69,361us-gaap_AvailableForSaleSecurities  
Total investments and funds held for clients, Amortized Cost   99,210ava_AvailableForSaleSecuritiesAndFundsHeldForClientsAmortizedCost [1]  
Total investments and funds held for clients, Unrealized Gain (Loss)   (2,522)ava_AvailableForSaleSecuritiesAndFundsHeldForClientsUnrealizedGainLoss  
Total investments and funds held for clients, fair value   96,688ava_FundsHeldForCustomersIncludingSecuritiesAvailableForSale  
Gross realized gains 3us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 19us-gaap_AvailableForSaleSecuritiesGrossRealizedGains  
Available-for-sale Securities, Gross Realized Losses (735)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses 0us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses  
U.S. Government Agency [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total securities available for sale, Amortized Cost   63,633us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember		 [1]  
Total securities available for sale, Unrealized Gain (Loss)   (2,555)us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember		  
Municipal [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total securities available for sale, Amortized Cost   3,497us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SovereignDebtLocalGovernmentUnspecifiedMember		 [1]  
Total securities available for sale, Unrealized Gain (Loss)   21us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SovereignDebtLocalGovernmentUnspecifiedMember		  
Corporate fixed income - financial [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total securities available for sale, Amortized Cost   3,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ava_CorporateDebtSecuritiesFinancialMember		 [1]  
Total securities available for sale, Unrealized Gain (Loss)   0us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ava_CorporateDebtSecuritiesFinancialMember		  
Corporate fixed income - industrial [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total securities available for sale, Amortized Cost   753us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ava_CorporateDebtSecuritiesIndustrialMember		 [1]  
Total securities available for sale, Unrealized Gain (Loss)   12us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ava_CorporateDebtSecuritiesIndustrialMember		  
Certificates of deposits [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Total securities available for sale, Amortized Cost   1,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CertificatesOfDepositMember		 [1]  
Total securities available for sale, Unrealized Gain (Loss)   0us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CertificatesOfDepositMember		  
Fair Value, Measurements, Recurring [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Money Market Funds, at Carrying Value   11,180us-gaap_MoneyMarketFundsAtCarryingValue
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		  
Fair Value, Measurements, Recurring [Member] | U.S. Government Agency [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities   61,078us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember		  
Fair Value, Measurements, Recurring [Member] | Municipal [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities   3,518us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SovereignDebtLocalGovernmentUnspecifiedMember		  
Fair Value, Measurements, Recurring [Member] | Corporate fixed income - financial [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities   3,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ava_CorporateDebtSecuritiesFinancialMember		  
Fair Value, Measurements, Recurring [Member] | Corporate fixed income - industrial [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities   765us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ava_CorporateDebtSecuritiesIndustrialMember		  
Fair Value, Measurements, Recurring [Member] | Certificates of deposits [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities   1,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CertificatesOfDepositMember		  
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Money Market Funds, at Carrying Value   11,180us-gaap_MoneyMarketFundsAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		  
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Government Agency [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities   61,078us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember		  
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Municipal [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities   3,518us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SovereignDebtLocalGovernmentUnspecifiedMember		  
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate fixed income - financial [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities   3,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ava_CorporateDebtSecuritiesFinancialMember		  
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate fixed income - industrial [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities   765us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ava_CorporateDebtSecuritiesIndustrialMember		  
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Certificates of deposits [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities   $ 1,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CertificatesOfDepositMember		  
[1] Amortized cost represents the original purchase price of the investments, plus or minus any amortized purchase premiums or accreted purchase discounts.