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Stock Compensation Plans (Impact Of The Market Condition On The Vested Performance Shares) (Details) (Total Shareholder Return Market-Based Awards [Member], USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Total Shareholder Return Market-Based Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance shares vested 167,584us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= ava_TotalShareholderReturnMarketBasedAwardsMember
176,718us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= ava_TotalShareholderReturnMarketBasedAwardsMember
168,101us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= ava_TotalShareholderReturnMarketBasedAwardsMember
Impact of market condition on shares vested (70,385)ava_ShareBasedCompensationArrangementByShareBasedPaymentAwardImpactOfMarketConditionOnSharesVested
/ us-gaap_AwardTypeAxis
= ava_TotalShareholderReturnMarketBasedAwardsMember
(176,718)ava_ShareBasedCompensationArrangementByShareBasedPaymentAwardImpactOfMarketConditionOnSharesVested
/ us-gaap_AwardTypeAxis
= ava_TotalShareholderReturnMarketBasedAwardsMember
(168,101)ava_ShareBasedCompensationArrangementByShareBasedPaymentAwardImpactOfMarketConditionOnSharesVested
/ us-gaap_AwardTypeAxis
= ava_TotalShareholderReturnMarketBasedAwardsMember
Shares of common stock earned 97,199ava_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesOfCommonStockEarned
/ us-gaap_AwardTypeAxis
= ava_TotalShareholderReturnMarketBasedAwardsMember
0ava_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesOfCommonStockEarned
/ us-gaap_AwardTypeAxis
= ava_TotalShareholderReturnMarketBasedAwardsMember
0ava_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesOfCommonStockEarned
/ us-gaap_AwardTypeAxis
= ava_TotalShareholderReturnMarketBasedAwardsMember
Intrinsic value of common stock earned $ 3,436ava_ShareBasedCompensationArrangementByShareBasedPaymentAwardCommonStockEarnedIntrinsicValue
/ us-gaap_AwardTypeAxis
= ava_TotalShareholderReturnMarketBasedAwardsMember
$ 0ava_ShareBasedCompensationArrangementByShareBasedPaymentAwardCommonStockEarnedIntrinsicValue
/ us-gaap_AwardTypeAxis
= ava_TotalShareholderReturnMarketBasedAwardsMember
$ 0ava_ShareBasedCompensationArrangementByShareBasedPaymentAwardCommonStockEarnedIntrinsicValue
/ us-gaap_AwardTypeAxis
= ava_TotalShareholderReturnMarketBasedAwardsMember