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Revenue Revenue Utility Related Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Revenue from Contract with Customer [Abstract] |  |  |  |
Public Utility Operating Expenses Excise Taxes Collected | $ 12,688 | $ 12,986 | $ 31,777 | $ 32,153

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- Definition Public Utility Operating Expenses Excise Taxes Collected and Reported Gross in Revenues and Operating Expenses + References No definition available. + Details
Name: | ava_PublicUtilityOperatingExpensesExciseTaxesCollected
Namespace Prefix: | ava_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration